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2. Nanosheet-stabilized emulsions: ultra-low loading segregated networks and surface energy determination of pristine few-layer 2D materials

Author

Ogilvie, Sean P., Large, Matthew J., Cass, Adam J., Graf, Aline Amorim, Sehnal, Anne C., O'Mara, Marcus A., Lynch, Peter J., Salvage, Jonathan P., Alfonso, Marco, Poulin, Philippe, King, Alice A. K., and Dalton, Alan B.

Subjects
Physics - Applied Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
Abstract

A framework is developed to allow emulsification to be used to fabricate functional structures from, and study the properties of, pristine layered nanosheets. Liquid-exfoliated few-layer graphene and MoS2 are demonstrated to stablize emulsions which exhibit system-scale electrical conductivity at ultra-low nanosheet volume fractions. When deposited on a substrate, the controlled drying dynamics of these emulsions facilitates their application as inks where the lack of any coffee ring effect allows manual deposition of high conductivity films. In order to broaden the range of compositions and subsequently applications, an understanding of emulsion stability and orientation in terms of surface energy of the three phases is developed. Importantly, this model facilitates determination of the surface energies of the nanosheets themselves and subsequently allows design of emulsions. Finally, emulsification by surfactant-exfoliated nanosheets and emulsion inversion using basic solution are demonstrated to allow water-based processing where composition and orientation can be tailored to enable applications.

Published
2020
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4. Explosive percolation yields highly-conductive polymer nanocomposites

Author

Meloni, Manuela, Large, Matthew J., González Domínguez, José Miguel, Victor-Román, Sandra, Fratta, Giuseppe, Istif, Emin, Tomes, Oliver, Salvage, Jonathan P., Ewels, Christopher P., Pelaez-Fernandez, Mario, Arenal, Raul, Benito, Ana, Maser, Wolfgang K., King, Alice A. K., Ajayan, Pulickel M., Ogilvie, Sean P., and Dalton, Alan B.

Published
2022
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5. Flexible Organic X‐Ray Sensors: Solving the Key Constraints of PET Substrates.

Author

Bashiri, Aishah, Large, Matthew J., Griffith, Matthew J., Papale, Laurance, Philippa, Bronson, Hall, Chris, Bolst, David, Guatelli, Susanna, Mozer, Attila J., Petasecca, Marco, and Posar, Jessie A.

Subjects
*NUCLEAR counters, *RADIATION tolerance, *SUBSTRATES (Materials science), *ORGANIC semiconductors, *AMORPHOUS silicon
Abstract

Organic semiconductor‐based sensors are a unique class of wearable x‐ray detectors, as the response from their carbon‐based composition can mimic the response of the human body to radiation. A thin (260 nm) flexible P3HT: o‐IDTBR‐based organic sensor, deposited onto a conductive Kapton substrate is demonstrated, can provide precise and artifact‐free dosimetry under synchrotron x‐rays with sensitivities of (1958 ± 31)pCGy−1cm−2 without bias. The sensor is capable of accurately resolving multiple 50 µm‐wide x‐rays with a full‐width‐half‐max of (51.6 ± 1.9)µm for a range of energies (47–87.5)keV and dose‐rates (0.21–0.45)kGy s−1. Organic sensors fabricated with plastic polyethylene substrates exhibit unreliable x‐ray responses and broadening of the full‐width‐half‐max. Simulations reveal that x‐ray induced electrostatic charge generated from the polyethylene causes a reverse polarity of the signal. X‐ray charge mapping shows the effective area sensitized with the polyethylene device extends twice the length of the pixel area, while sensors with Kapton substrates closely match the expected active area. Radiation tolerance of P3HT:o‐IDTBR devices maintain 85.4% of the initial x‐ray sensitivity after 10 kGy with similar radiation tolerances to amorphous silicon. This study confirms the unsuitability of polyethylene substrates for flexible radiation detectors, providing the first evidence of the quantitative and spatial resolution limitations created by the generation of radiation‐induced charge. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Structure-property relationships in silver nanowire coatings

Author

Large, Matthew J. and Dalton, Alan B.

Subjects
620.1
Abstract

This report discusses new understanding of the fundamental links between the micro- and nano-structure of silver nanowire-based transparent conductive films and their resulting macroscopic electrical and optical properties. A new relationship between the optical transmittance and electrical sheet resistance is derived based on percolation theory. Application of this model to experimental data allows parameters of film micro-structure to be determined using macroscopic measurement techniques. Conversely, it is also possible to tailor the optoelectronic properties of a film by manipulation of the length distribution of the constituent nanowire material. Further, we examine the effect of geometrical confinement on silver nanowire networks. It is observed that as feature sizes decrease below some threshold value, there is a rapid increase of sheet resistance. This is understood in terms of finite-size scaling theory, and is linked to film parameters that can be measured from the transmittance-sheet resistance curve (T-R curve) of a given material. The effect is quantified using experimental and simulation data, and the implications for device structure and design are discussed. Expressions describing both the T-R and finite-size scaling responses of a material are derived in terms of length distribution statistics, which allows a deeper understanding of how materials may be tailored to meet application-specific requirements. Finally, a preliminary investigation of the formation of graphene-silver nanowire hybrid electrodes by mechanical transfer deposition of graphene is performed. The T-R model developed is applied to understand the change in film performance (in terms of the T-R response). It is hoped that further development of the work presented will lead to a coherent framework for quantifying and predicting a range of film properties for nanowire materials. This will facilitate material design and speed up optimisation of materials for specific applications, both in academic and industrial settings.

Published
2016

9. Hydrogenated amorphous silicon high flux x-ray detectors for synchrotron microbeam radiation therapy

Author

Large, Matthew J, primary, Bizzarri, Marco, additional, Calcagnile, Lucio, additional, Caprai, Mirco, additional, Caricato, Anna Paola, additional, Catalano, Roberto, additional, Cirrone, Giuseppe A P, additional, Croci, Tommaso, additional, Cuttone, Giacomo, additional, Dunand, Sylvain, additional, Fabi, Michele, additional, Frontini, Luca, additional, Gianfelici, Benedetta, additional, Grimani, Catia, additional, Ionica, Maria, additional, Kanxheri, Keida, additional, Lerch, Michael L F, additional, Liberali, Valentino, additional, Martino, Maurizio, additional, Maruccio, Giuseppe, additional, Mazza, Giovanni, additional, Menichelli, Mauro, additional, Monteduro, Anna Grazia, additional, Moscatelli, Francesco, additional, Morozzi, Arianna, additional, Pallotta, Stefania, additional, Papi, Andrea, additional, Passeri, Daniele, additional, Pedio, Maddalena, additional, Petringa, Giada, additional, Peverini, Francesca, additional, Piccolo, Lorenzo, additional, Placidi, Pisana, additional, Quarta, Gianluca, additional, Rizzato, Silvia, additional, Rossi, Alessandro, additional, Rossi, Giulia, additional, de Rover, Vincent, additional, Sabbatini, Federico, additional, Servoli, Leonello, additional, Stabile, Alberto, additional, Talamonti, Cinzia, additional, Tosti, Luca, additional, Villani, Mattia, additional, Wheadon, Richard J, additional, Wyrsch, Nicolas, additional, Zema, Nicola, additional, and Petasecca, Marco, additional

Published
2023
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11. Probing the interaction between 2D materials and oligoglycine tectomers

Author

University of Sussex, Gobierno de Aragón, UK Research and Innovation, Tripathi, Manoj [0000-0002-8052-428X], Garriga, Rosa [0000-0003-2607-7834], Ogilvie, Sean P. [0000-0002-0433-8186], Amorim Graf, Aline [0000-0003-3071-2255], Large, Matthew J. [0000-0001-7295-7619], Lynch, Peter J. [0000-0001-8805-0632], Papagelis, Konstantinos [0000-0001-5094-9837], Parthenios, Jhon [0000-0001-6066-7120], Cebolla, Vicente L. [0000-0002-9786-9217], Jurewicz, Izabela [0000-0003-0237-8384], Dalton, Alan B. [0000-0001-8043-1377], Muñoz, Guillermo [0000-0001-8567-4327], Tripathi, Manoj, Garriga, Rosa, Lee, Frank, Ogilvie, Sean P., Amorine Graf, Aline, Large, Matthew J., Lynch, Peter J., Papagelis, Konstantinos, Parthenios, John, Cebolla, Vicente L., Jurewicz, Izabela, Dalton, Alan B., Muñoz, Edgar, University of Sussex, Gobierno de Aragón, UK Research and Innovation, Tripathi, Manoj [0000-0002-8052-428X], Garriga, Rosa [0000-0003-2607-7834], Ogilvie, Sean P. [0000-0002-0433-8186], Amorim Graf, Aline [0000-0003-3071-2255], Large, Matthew J. [0000-0001-7295-7619], Lynch, Peter J. [0000-0001-8805-0632], Papagelis, Konstantinos [0000-0001-5094-9837], Parthenios, Jhon [0000-0001-6066-7120], Cebolla, Vicente L. [0000-0002-9786-9217], Jurewicz, Izabela [0000-0003-0237-8384], Dalton, Alan B. [0000-0001-8043-1377], Muñoz, Guillermo [0000-0001-8567-4327], Tripathi, Manoj, Garriga, Rosa, Lee, Frank, Ogilvie, Sean P., Amorine Graf, Aline, Large, Matthew J., Lynch, Peter J., Papagelis, Konstantinos, Parthenios, John, Cebolla, Vicente L., Jurewicz, Izabela, Dalton, Alan B., and Muñoz, Edgar

Abstract

Heterostructures of two-dimensional (2D) materials using graphene and MoS2 have enabled both pivotal fundamental studies and unprecedented sensing properties. These heterosystems are intriguing when graphene and MoS2 are interfaced with 2D sheets that emulate biomolecules, such as amino-terminated oligoglycine self-assemblies (known as tectomers). The adsorption of tectomer sheets over graphene and MoS2 modulates the physicochemical properties through electronic charge migration and mechanical stress transfer. Here, we present a systematic study by Raman spectroscopy and tectomer-functionalised scanning probe microscopy to understand mechanical strain, charge transfer and binding affinity in tectomer/graphene and tectomer/MoS2 hybrid structures. Raman mapping reveals distinctive thickness dependence of tectomer-induced charge transfer to MoS2, showing p-doping on monolayer MoS2 and n-doping on multilayer MoS2. By contrast, graphene is n-doped by tectomer independently of layer number, as confirmed by x-ray photoelectron spectroscopy. The interfacial adhesion between the amino groups and 2D materials are further explored using tectomer-functionalised probe microscopy. It is demonstrated here that these probes have potential for chemically sensitive imaging of 2D materials, which will be useful for mapping chemically distinct domains of surfaces and the number of layers. The facile tectomer-coating approach described here is an attractive soft-chemistry strategy for high-density amine-functionalisation of atomic force microscopy probes, therefore opening promising avenues for sensor applications.

Published
2022

12. Explosive percolation yields highly-conductive polymer nanocomposites

Author

European Commission, Engineering and Physical Sciences Research Council (UK), Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), Gobierno de Aragón, Meloni, Manuela [0000-0001-7009-3140], Large, Matthew J. [0000-0001-7295-7619], González Domínguez, José Miguel [0000-0002-0701-7695], Víctor-Román, Sandra [0000-0003-0924-5840], Fratta, Giuseppe [0000-0001-7903-1659], Istif, Emin [0000-0003-4700-7050], Savage, Jonathan P. [0000-0002-0627-6249], Peláez-Fernández, Mario [0000-0001-5079-621X], Arenal, Raúl [0000-0002-2071-9093], Benito, Ana M. [0000-0002-8654-7386], Maser, Wolfgang K. [0000-0003-4253-0758], King, Alice A. K. [0000-0002-1637-757X], Ogilvie, Sean P. [0000-0002-0433-8186], Dalton, Alan B. [0000-0001-8043-1377], Meloni, Manuela, Large, Matthew J., González Domínguez, José Miguel, Víctor-Román, Sandra, Fratta, Giuseppe, Istif, Emin, Tomes, Oliver, Savage, Jonathan P., Ewels, Christopher P., Peláez-Fernández, Mario, Arenal, Raúl, Benito, Ana M., Maser, Wolfgang K., King, Alice A. K., Ogilvie, Sean P., Dalton, Alan B., European Commission, Engineering and Physical Sciences Research Council (UK), Agencia Estatal de Investigación (España), Ministerio de Ciencia e Innovación (España), Gobierno de Aragón, Meloni, Manuela [0000-0001-7009-3140], Large, Matthew J. [0000-0001-7295-7619], González Domínguez, José Miguel [0000-0002-0701-7695], Víctor-Román, Sandra [0000-0003-0924-5840], Fratta, Giuseppe [0000-0001-7903-1659], Istif, Emin [0000-0003-4700-7050], Savage, Jonathan P. [0000-0002-0627-6249], Peláez-Fernández, Mario [0000-0001-5079-621X], Arenal, Raúl [0000-0002-2071-9093], Benito, Ana M. [0000-0002-8654-7386], Maser, Wolfgang K. [0000-0003-4253-0758], King, Alice A. K. [0000-0002-1637-757X], Ogilvie, Sean P. [0000-0002-0433-8186], Dalton, Alan B. [0000-0001-8043-1377], Meloni, Manuela, Large, Matthew J., González Domínguez, José Miguel, Víctor-Román, Sandra, Fratta, Giuseppe, Istif, Emin, Tomes, Oliver, Savage, Jonathan P., Ewels, Christopher P., Peláez-Fernández, Mario, Arenal, Raúl, Benito, Ana M., Maser, Wolfgang K., King, Alice A. K., Ogilvie, Sean P., and Dalton, Alan B.

Abstract

Explosive percolation is an experimentally-elusive phenomenon where network connectivity coincides with onset of an additional modification of the system; materials with correlated localisation of percolating particles and emergent conductive paths can realise sharp transitions and high conductivities characteristic of the explosively-grown network. Nanocomposites present a structurally- and chemically-varied playground to realise explosive percolation in practically-applicable systems but this is yet to be exploited by design. Herein, we demonstrate composites of graphene oxide and synthetic polymer latex which form segregated networks, leading to low percolation threshold and localisation of conductive pathways. In situ reduction of the graphene oxide at temperatures of <150 °C drives chemical modification of the polymer matrix to produce species with phenolic groups, which are known crosslinking agents. This leads to conductivities exceeding those of dense-packed networks of reduced graphene oxide, illustrating the potential of explosive percolation by design to realise low-loading composites with dramatically-enhanced electrical transport properties.

Published
2022

13. Hydrogenated amorphous silicon high flux x-ray detectors for synchrotron microbeam radiation therapy

Author

Large, Matthew J., Bizzarri, Marco, Calcagnile, Lucio, Caprai, Mirco, Caricato, Anna Paola, Catalano, Roberto, Cirrone, Giuseppe A. P., Croci, Tommaso, Cuttone, Giacomo, Dunand, Sylvain, Fabi, Michele, Frontini, Luca, Gianfelici, Benedetta, Grimani, Catia, Ionica, Maria, Kanxheri, Keida, Lerch, Michael L. F., Liberali, Valentino, Martino, Maurizio, Maruccio, Giuseppe, Mazza, Giovanni, Menichelli, Mauro, Monteduro, Anna Grazia, Moscatelli, Francesco, Morozzi, Arianna, Pallotta, Stefania, Papi, Andrea, Passeri, Daniele, Pedio, Maddalena, Petringa, Giada, Peverini, Francesca, Piccolo, Lorenzo, Placidi, Pisana, Quarta, Gianluca, Rizzato, Silvia, Rossi, Alessandro, Rossi, Giulia, de Rover, Vincent, Sabbatini, Federico, Servoli, Leonello, Stabile, Alberto, Talamonti, Cinzia, Tosti, Luca, Villani, Mattia, Wheadon, Richard J., Wyrsch, Nicolas, Zema, Nicola, and Petasecca, Marco

Subjects
Synchrotron Radiation, dosimetry, Microbeam, high dose-rate, resolution, beam, hydrogenated amorphous silicon, protocol, Radiation Damage, damage
Abstract

Objective. Microbeam radiation therapy (MRT) is an alternative emerging radiotherapy treatment modality which has demonstrated effective radioresistant tumour control while sparing surrounding healthy tissue in preclinical trials. This apparent selectivity is achieved through MRT combining ultra-high dose rates with micron-scale spatial fractionation of the delivered x-ray treatment field. Quality assurance dosimetry for MRT must therefore overcome a significant challenge, as detectors require both a high dynamic range and a high spatial resolution to perform accurately. Approach. In this work, a series of radiation hard a-Si:H diodes, with different thicknesses and carrier selective contact configurations, have been characterised for x-ray dosimetry and real-time beam monitoring applications in extremely high flux beamlines utilised for MRT at the Australian Synchrotron. Results. These devices displayed superior radiation hardness under constant high dose-rate irradiations on the order of 6000 Gy s(-1), with a variation in response of 10% over a delivered dose range of approximately 600 kGy. Dose linearity of each detector to x-rays with a peak energy of 117 keV is reported, with sensitivities ranging from (2.74 & PLUSMN; 0.02) nC/Gy to (4.96 & PLUSMN; 0.02) nC/Gy. For detectors with 0.8 & mu;m thick active a-Si:H layer, their operation in an edge-on orientation allows for the reconstruction of micron-size beam profiles (microbeams). The microbeams, with a nominal full-width-half-max of 50 & mu;m and a peak-to-peak separation of 400 & mu;m, were reconstructed with extreme accuracy. The full-width-half-max was observed as 55 & PLUSMN; 1 & mu;m. Evaluation of the peak-to-valley dose ratio and dose-rate dependence of the devices, as well as an x-ray induced charge (XBIC) map of a single pixel is also reported. Significance. These devices based on novel a-Si:H technology possess a unique combination of accurate dosimetric performance and radiation resistance, making them an ideal candidate for x-ray dosimetry in high dose-rate environments such as FLASH and MRT.

Published
2023

15. Resistive gas sensors based on MoS2 nanosheets with high response to low NO2 concentrations

Author

Ministerio de Ciencia e Innovación (España), European Commission, Sayago, I. [0000-0002-5917-9469], Sánchez-Vicente, Carlos [0000-0002-7665-1075], Santos, José Pedro [0000-0002-4181-5148], Ogilvie, Sean P. [0000-0002-0433-8186], Large, Matthew J. [0000-0001-7295-7619], Dalton, Alan B. [0000-0001-8043-1377], Garriga, Rosa [0000-0003-2607-7834], Muñoz, Edgar [0000-0001-9309-2394], Sayago, Isabel, Sánchez-Vicente, Carlos, Sanjurjo, José Luis, Santos, José Pedro, Ogilvie, Sean P., Wood, Hannah J., Graf, Aline A., Large, Matthew J., Dalton, Alan B., Garriga, Rosa, Muñoz, Edgar, Ministerio de Ciencia e Innovación (España), European Commission, Sayago, I. [0000-0002-5917-9469], Sánchez-Vicente, Carlos [0000-0002-7665-1075], Santos, José Pedro [0000-0002-4181-5148], Ogilvie, Sean P. [0000-0002-0433-8186], Large, Matthew J. [0000-0001-7295-7619], Dalton, Alan B. [0000-0001-8043-1377], Garriga, Rosa [0000-0003-2607-7834], Muñoz, Edgar [0000-0001-9309-2394], Sayago, Isabel, Sánchez-Vicente, Carlos, Sanjurjo, José Luis, Santos, José Pedro, Ogilvie, Sean P., Wood, Hannah J., Graf, Aline A., Large, Matthew J., Dalton, Alan B., Garriga, Rosa, and Muñoz, Edgar

Abstract

This work reports on two-dimensional MoS 2 nanomaterial-based resistive gas sensors and their response to sub-ppm NO 2 concentrations. The sensitive material was prepared by drop-casting MoS 2 nanosheet dispersions on silicon nitride suspended membranes. The sensor response was studied at operating temperatures up to 300 °C. The fabricated sensors provided good responses to NO 2 concentrations as low as 20 ppb at room temperature. The n-type MoS 2 sensing mechanism is here discussed.

Published
2021

16. Probing the interaction between 2D materials and oligoglycine tectomers

Author

Tripathi, Manoj, primary, Garriga, Rosa, additional, Lee, Frank, additional, Ogilvie, Sean P, additional, Graf, Aline Amorim, additional, Large, Matthew J, additional, Lynch, Peter J, additional, Papagelis, Konstantinos, additional, Parthenios, John, additional, Cebolla, Vicente L, additional, Jurewicz, Izabela, additional, Dalton, Alan B, additional, and Muñoz, Edgar, additional

Published
2022
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17. Nanosheet-Stabilized Emulsions: Near-Minimum Loading and Surface Energy Design of Conductive Networks

Author

Ogilvie, Sean P., primary, Large, Matthew J., additional, O’Mara, Marcus A., additional, Sehnal, Anne C., additional, Amorim Graf, Aline, additional, Lynch, Peter J., additional, Cass, Adam J., additional, Salvage, Jonathan P., additional, Alfonso, Marco, additional, Poulin, Philippe, additional, King, Alice A. K., additional, and Dalton, Alan B., additional

Published
2022
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18. Tuneable synthetic reduced graphene oxide scaffolds elicit high levels of three-dimensional glioblastoma interconnectivity in vitro

Author

Brown, Christopher J., primary, Simon, Thomas, additional, Cilibrasi, Chiara, additional, Lynch, Peter J., additional, Harries, Rhiannon W., additional, Graf, Aline Amorim, additional, Large, Matthew J., additional, Ogilvie, Sean P., additional, Salvage, Jonathan P., additional, Dalton, Alan B., additional, Giamas, Georgios, additional, and King, Alice A. K., additional

Published
2022
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20. Flexible Polymer X-ray Detectors with Non-fullerene Acceptors for Enhanced Stability: Toward Printable Tissue Equivalent Devices for Medical Applications

Author

Large, Matthew J., primary, Posar, Jessie A., additional, Mozer, Attila J., additional, Nattestad, Andrew, additional, Alnaghy, Saree, additional, Carolan, Martin, additional, Sellin, Paul J., additional, Davies, Justin, additional, Pastuovic, Zeljko, additional, Lerch, Michael L. F., additional, Guatelli, Susanna, additional, Rosenfeld, Anatoly, additional, Griffith, Matthew J., additional, and Petasecca, Marco, additional

Published
2021
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21. Controlled assembly and reduction of graphene oxide networks for conductive composites

Author

Meloni, Manuela [0000-0001-7009-3140], Víctor-Román, Sandra [0000-0003-0924-5840], King, Alice A. K. [0000-0002-1637-757X], Fratta, Giuseppe [0000-0001-7903-1659], Istif, Emin [0000-0003-4700-7050], Large, Matthew J. [0000-0001-7295-7619], Peláez-Fernández, Mario [0000-0001-5079-621X], Ogilvie, Sean P. [0000-0002-0433-8186], Arenal, Raúl [0000-0002-2071-9093], Benito, Ana M. [0000-0002-8654-7386], Maser, Wolfgang K. [0000-0003-4253-0758], Dalton, Alan B. [0000-0001-8043-1377], Meloni, Manuela, Víctor-Román, Sandra, King, Alice A. K., Fratta, Giuseppe, Istif, Emin, Large, Matthew J., Peláez-Fernández, Mario, Ogilvie, Sean P., Arenal, Raúl, Benito, Ana M., Maser, Wolfgang K., Dalton, Alan B., Meloni, Manuela [0000-0001-7009-3140], Víctor-Román, Sandra [0000-0003-0924-5840], King, Alice A. K. [0000-0002-1637-757X], Fratta, Giuseppe [0000-0001-7903-1659], Istif, Emin [0000-0003-4700-7050], Large, Matthew J. [0000-0001-7295-7619], Peláez-Fernández, Mario [0000-0001-5079-621X], Ogilvie, Sean P. [0000-0002-0433-8186], Arenal, Raúl [0000-0002-2071-9093], Benito, Ana M. [0000-0002-8654-7386], Maser, Wolfgang K. [0000-0003-4253-0758], Dalton, Alan B. [0000-0001-8043-1377], Meloni, Manuela, Víctor-Román, Sandra, King, Alice A. K., Fratta, Giuseppe, Istif, Emin, Large, Matthew J., Peláez-Fernández, Mario, Ogilvie, Sean P., Arenal, Raúl, Benito, Ana M., Maser, Wolfgang K., and Dalton, Alan B.

Abstract

Graphene has attracted enormous interest in the scientific community as the first 2D material with exceptional mechanical, electronic and thermal properties. Pristine Graphene is notoriously difficult to process for macroscale applications, to overcome this many people use graphene oxide (GO) instead. GO is water soluble and easily functionalised and so can be simply processed into various systems. GO lacks the exceptional electronic properties of graphene due to structural disorder, therefore an important area of research is on the reduction of GO, which partly restores the structure and properties of graphene. Various techniques have been developed to perform the reduction step. We report a simple approach for preparing conductive Polymer Latex-rGO composites by using a latex-assembly method. After a treatment in the oven at low T, we can reduce the GO in situ. We make use of the inherent GO properties to optimise the aqueous composite fabrication, which is scalable and adaptable, and then restore conductivity with a simple, low temperature, heating step; opening up pathways to tunable electronic composite materials on a large scale.

Published
2019

22. Sonochemical edge functionalisation of molybdenum disulfide

Author

European Commission, Ministerio de Economía y Competitividad (España), Gobierno de Aragón, Science Foundation Ireland, European Research Council, Universidad de Zaragoza, Amorim Graf, Aline [0000-0003-3071-2255], Large, Matthew J. [0000-0001-7295-7619], Ray, Santanu [0000-0002-2414-2930], Arenal, Raul [0000-0002-2071-9093], Dalton, Alan B. [0000-0001-8043-1377], Amorim Graf, Aline, Large, Matthew J., Ogilvie, Sean P., Rong, Yuanyang, Lynch, Peter J., Fratta, Giuseppe, Ray, Santanu, Shmeliov, Aleksey, Nicolosi, Valeria, Arenal, Raúl, King, Alice A. K., Dalton, Alan B., European Commission, Ministerio de Economía y Competitividad (España), Gobierno de Aragón, Science Foundation Ireland, European Research Council, Universidad de Zaragoza, Amorim Graf, Aline [0000-0003-3071-2255], Large, Matthew J. [0000-0001-7295-7619], Ray, Santanu [0000-0002-2414-2930], Arenal, Raul [0000-0002-2071-9093], Dalton, Alan B. [0000-0001-8043-1377], Amorim Graf, Aline, Large, Matthew J., Ogilvie, Sean P., Rong, Yuanyang, Lynch, Peter J., Fratta, Giuseppe, Ray, Santanu, Shmeliov, Aleksey, Nicolosi, Valeria, Arenal, Raúl, King, Alice A. K., and Dalton, Alan B.

Abstract

Liquid-phase exfoliation (LPE) has been shown to be capable of producing large quantities of high-quality dispersions suitable for processing into subsequent applications. LPE typically requires surfactants for aqueous dispersions or organic solvents with high boiling point. However, they have major drawbacks such as toxicity, aggregation during solvent evaporation or the presence of residues. Here, dispersions of molybdenum disulfide in acetone are prepared and show much higher concentration and stability than predicted by Hansen parameter analysis. Aiming to understand these enhanced properties, the nanosheets were characterised using UV-visible spectroscopy, zeta potential measurements, atomic force microscopy, Raman spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and scanning transmission microscopy combined with spatially-resolved electron energy loss spectroscopy. Also, the performance of the MoS2 nanosheets exfoliated in acetone was compared to that of those exfoliated in isopropanol as a catalyst for the hydrogen evolution reaction. The conclusion from the chemical characterisation was that MoS2 nanosheets exfoliated in acetone have an oxygen edge functionalisation, in the form of molybdenum oxides, changing its interaction with solvents and explaining the observed high-quality and stability of the resulting dispersion in a low boiling point solvent. Exfoliation in acetone could potentially be applied as a pretreatment to modify the solubility of MoS2 by edge functionalisation.

Published
2019

23. Cell–substrate interactions lead to internalization and localization of layered MoS₂ nanosheets

Author

Harries, Rhiannon W, Brown, Christopher J, Woodbine, Lisa, Amorim Graf, Aline, Large, Matthew J, Clifford, Keiran, Lynch, Peter J, Ogilvie, Sean P, Dalton, Alan B, and King, Alice A K

Abstract

Using an ultrathin film substrate, the first internalization of MoS2 nanosheets through mechanotransduction is demonstrated. The usual method of dispersing nanomaterials in the media limits interactions to random, serendipitous surface contact, and the nanoparticles must be dispersible in media. A substrate approach means that cells directly engage with the nanomaterial, sensing and adhering through sustained interaction and actively internalizing the nanomaterial. This activates previously unobserved cell–substrate mechanotransduction mechanisms and receptor-mediated uptake pathways. Moreover, a wide variety of nonsoluble nanomaterials can be used, improving control over the amount of material exposed to a cell through tunable deposition density. Volumetric Raman mapping demonstrates localization of material to the endoplasmic reticulum, a historically hard-to-target region. The nanosheets do not cause cytotoxicity, are transferred to daughter cells, and have applicability across multiple cell lines. The innate fluorescence or Raman signal of the nanosheet can be utilized for live cell imaging, and targeted accumulation within specific cellular organelles offers potential for photothermal treatments or drug delivery vectors. This substrate-mediated approach provides a step change to studying nanomaterial–cellular interactions, taking advantage of the broad palette of available two-dimensional (2D) materials and making use of mechanosensing to stimulate tunable responses, with potential for therapies and diagnostics.

Published
2021

24. Ultrasensitive strain gauges enabled by graphene-stabilized silicone emulsions

Author

O'Mara, Marcus A, Ogilvie, Sean P, Large, Matthew J, Salvage, Jonathan P, Graf, Aline Amorim, Sehnal, Anne C, Lynch, Peter J, Jurewicz, Izabela, King, Alice A K, and Dalton, Alan B

Subjects
Coalescence (physics), Materials science, Graphene, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Silicone rubber, Elastomer, Microstructure, 01 natural sciences, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, law.invention, Biomaterials, chemistry.chemical_compound, Silicone, chemistry, Gauge factor, law, Electrochemistry, Composite material, 0210 nano-technology, Strain gauge
Abstract

Here, we present an approach to incorporate graphene nanosheets into a silicone rubber matrix via solid stabilization of oil-in-water emulsions. These emulsions can be cured into discrete, graphenecoated silicone balls or continuous, elastomeric films by controlling the degree of coalescence. We characterize the electromechanical properties of the resulting composites as a function of interdiffusion time and graphene loading level. With conductivities approaching 1 S m-1, elongation to break up to 160% and a gauge factor of ~20 in the low-strain linear regime, we can accurately measure small strains such as pulse. At higher strains, the electromechanical response exhibits a robust exponential dependence, allowing accurate readout for higher strain movements such as chest motion and joint bending. The exponential gauge factor is found to be ~20, independent of loading level and valid up to 80% strain; this consistent performance is due to the emulsiontemplated microstructure of the composites. The robust behavior may facilitate high-strain sensing in the non-linear regime using nanocomposites, where relative resistance change values in excess of 107 enable highly accurate bodily motion monitoring.

Published
2020

25. Ultra-Sensitive Strain Gauges Enabled by Graphene-Stabilized Silicone Emulsions

Author

O'Mara, Marcus A., Ogilvie, Sean P., Large, Matthew J., Salvage, Jonathan P., Graf, Aline Amorim, Sehnal, Anne C., Lynch, Peter J., Jurewicz, Izabela, King, Alice A.K, and Dalton, Alan B.

Abstract

Here, we present an approach to incorporate graphene nanosheets into a silicone rubber matrix via solid stabilization of oil-in-water emulsions. These emulsions can be cured into discrete, graphenecoated silicone balls or continuous, elastomeric films by controlling the degree of coalescence. We characterize the electromechanical properties of the resulting composites as a function of interdiffusion time and graphene loading level. With conductivities approaching 1 S m-1, elongation to break up to 160% and a gauge factor of ~20 in the low-strain linear regime, we can accurately measure small strains such as pulse. At higher strains, the electromechanical response exhibits a robust exponential dependence, allowing accurate readout for higher strain movements such as chest motion and joint bending. The exponential gauge factor is found to be ~20, independent of loading level and valid up to 80% strain; this consistent performance is due to the emulsiontemplated microstructure of the composites. The robust behavior may facilitate high-strain sensing in the non-linear regime using nanocomposites, where relative resistance change values in excess of 107 enable highly accurate bodily motion monitoring.

Published
2020

26. Structural Defects Modulate Electronic and Nanomechanical Properties of 2D Materials

Author

Tripathi, Manoj, primary, Lee, Frank, additional, Michail, Antonios, additional, Anestopoulos, Dimitris, additional, McHugh, James G., additional, Ogilvie, Sean P., additional, Large, Matthew J., additional, Graf, Aline Amorim, additional, Lynch, Peter J., additional, Parthenios, John, additional, Papagelis, Konstantinos, additional, Roy, Soumyabrata, additional, Saadi, M. A. S. R., additional, Rahman, Muhammad M., additional, Pugno, Nicola Maria, additional, King, Alice A. K., additional, Ajayan, Pulickel M., additional, and Dalton, Alan B., additional

Published
2021
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27. Mechanochromic Sensors: Mechanochromic and Thermochromic Sensors Based on Graphene Infused Polymer Opals (Adv. Funct. Mater. 31/2020)

Author

Jurewicz, Izabela, primary, King, Alice A. K., additional, Shanker, Ravi, additional, Large, Matthew J., additional, Smith, Ronan J., additional, Maspero, Ross, additional, Ogilvie, Sean P., additional, Scheerder, Jurgen, additional, Han, Jun, additional, Backes, Claudia, additional, Razal, Joselito M., additional, Florescu, Marian, additional, Keddie, Joseph L., additional, Coleman, Jonathan N., additional, and Dalton, Alan B., additional

Published
2020
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29. Laser-Deposited Carbon Aerogel Derived from Graphene Oxide Enables NO2-Selective Parts-per-Billion Sensing

Author

Nufer, Sebastian, primary, Lynch, Peter J., additional, Large, Matthew J., additional, Ogilvie, Sean P., additional, Salvage, Jonathan P., additional, Pelaez-Fernandez, Mario, additional, Waters, Thomas, additional, Jurewicz, Izabela, additional, Muñoz, Edgar, additional, Arenal, Raul, additional, Benito, Ana M., additional, Maser, Wolfgang K., additional, Tagmatarchis, Nikos, additional, Ewels, Christopher P., additional, Brunton, Adam, additional, and Dalton, Alan B., additional

Published
2020
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32. Characterization of an organic semiconductor diode for dosimetry in radiotherapy

Author

Posar, Jessie A., primary, Davis, Jeremy, additional, Large, Matthew J., additional, Basiricò, Laura, additional, Ciavatti, Andrea, additional, Fraboni, Beatrice, additional, Dhez, Olivier, additional, Wilkinson, Dean, additional, Sellin, Paul J., additional, Griffith, Matthew J., additional, Lerch, Michael L. F., additional, Rosenfeld, Anatoly, additional, and Petasecca, Marco, additional

Published
2020
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34. Mechanochromic and Thermochromic Sensors Based on Graphene Infused Polymer Opals

Author

Jurewicz, Izabela, primary, King, Alice A. K., additional, Shanker, Ravi, additional, Large, Matthew J., additional, Smith, Ronan J., additional, Maspero, Ross, additional, Ogilvie, Sean P., additional, Scheerder, Jurgen, additional, Han, Jun, additional, Backes, Claudia, additional, Razal, Joselito M., additional, Florescu, Marian, additional, Keddie, Joseph L., additional, Coleman, Jonathan N., additional, and Dalton, Alan B., additional

Published
2020
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35. Functionalization of silver nanowire transparent electrodes with self-assembled 2-Dimensional tectomer nanosheets

Author

Engineering and Physical Sciences Research Council (UK), Ministerio de Economía y Competitividad (España), European Commission, Jurewicz, Izabela [0000-0003-0237-8384], Garriga, Rosa [0000-0003-2607-7834], Large, Matthew J. [0000-0001-7295-7619], Bardi, Niki [0000-0002-2679-5150], King, Alice A. K. [0000-0002-1637-757X], Velliou, Eirini G. [0000-0003-3313-4446], Watts, John F. [0000-0003-2109-0335], Muñoz, Edgar [0000-0001-9309-2394], Dalton, Alan B. [0000-0001-8043-1377], Jurewicz, Izabela, Garriga, Rosa, Large, Matthew J., Burn, Jake, Bardi, Niki, King, Alice A. K., Velliou, Eirini G., Watts, John F., Hinder, Steven J., Muñoz, Edgar, Dalton, Alan B., Engineering and Physical Sciences Research Council (UK), Ministerio de Economía y Competitividad (España), European Commission, Jurewicz, Izabela [0000-0003-0237-8384], Garriga, Rosa [0000-0003-2607-7834], Large, Matthew J. [0000-0001-7295-7619], Bardi, Niki [0000-0002-2679-5150], King, Alice A. K. [0000-0002-1637-757X], Velliou, Eirini G. [0000-0003-3313-4446], Watts, John F. [0000-0003-2109-0335], Muñoz, Edgar [0000-0001-9309-2394], Dalton, Alan B. [0000-0001-8043-1377], Jurewicz, Izabela, Garriga, Rosa, Large, Matthew J., Burn, Jake, Bardi, Niki, King, Alice A. K., Velliou, Eirini G., Watts, John F., Hinder, Steven J., Muñoz, Edgar, and Dalton, Alan B.

Abstract

Here, we describe the unusual self-assembly of amine-terminated oligoglycine peptides into extended two-dimensional sheets in the presence of silver nanowires. The resulting tectomer sheets are shown to have a strong affinity for the nanowires through a charge-transfer interaction as evidenced by X-ray photoelectron spectroscopy. We show that extended assemblies of metal–peptide hybrids offer additional augmentative functionalities; for instance, the tectomer sheets are hydrophobic in nature and act as a protective layer preventing oxidation and degradation of the nanowires when exposed to atmospheric conditions. Moreover, for silver nanowire percolating networks the presence of the peptide markedly increases the overall electrical conductivity through mechanical squeezing of wire–wire junctions in the network. The peptide–metal interface can be controlled by pH stimulus thus potentially offering new directions where silver nanowire assemblies are used for transparent electrodes ranging from antimicrobial coatings to biosensors.

Published
2018

36. Percolating metallic structures templated on laser-deposited carbon nanofoams derived from graphene oxide: applications in humidity sensing

Author

European Commission, Ministerio de Economía y Competitividad (España), Gobierno de Aragón, Nufer, Sebastian [0000-0003-2636-8738], Fantanas, Dimitrios [0000-0002-4068-123X], Ogilvie, Sean P. [0000-0002-0433-8186], Large, Matthew J. [0000-0001-7295-7619], Winterauer, Dominik J. [0000-0002-0117-258X], Meloni, Manuela [0000-0001-7009-3140], King, Alice A. K. [0000-0002-1637-757X], Schellenbergerb, Pascale [0000-0002-3719-3120], Shmeliov, Aleksey [0000-0002-0697-2885], Víctor-Román, Sandra [0000-0003-0924-5840], Peláez-Fernández, Mario [0000-0001-5079-621X], Nicolosi, Valeria [0000-0002-7637-4813], Arenal, Raúl [0000-0002-2071-9093], Benito, Ana M. [0000-0002-8654-7386], Nufer, Sebastian, Fantanas, Dimitrios, Ogilvie, Sean P., Large, Matthew J., Winterauer, Dominik J., Salvage, Jonathan P., Meloni, Manuela, King, Alice A. K., Schellenberger, Pascale, Shmeliov, Aleksey, Víctor-Román, Sandra, Peláez-Fernández, Mario, Nicolosi, Valeria, Arenal, Raúl, Benito, Ana M., Maser, Wolfgang K., Brunton, Adam, Dalton, Alan B., European Commission, Ministerio de Economía y Competitividad (España), Gobierno de Aragón, Nufer, Sebastian [0000-0003-2636-8738], Fantanas, Dimitrios [0000-0002-4068-123X], Ogilvie, Sean P. [0000-0002-0433-8186], Large, Matthew J. [0000-0001-7295-7619], Winterauer, Dominik J. [0000-0002-0117-258X], Meloni, Manuela [0000-0001-7009-3140], King, Alice A. K. [0000-0002-1637-757X], Schellenbergerb, Pascale [0000-0002-3719-3120], Shmeliov, Aleksey [0000-0002-0697-2885], Víctor-Román, Sandra [0000-0003-0924-5840], Peláez-Fernández, Mario [0000-0001-5079-621X], Nicolosi, Valeria [0000-0002-7637-4813], Arenal, Raúl [0000-0002-2071-9093], Benito, Ana M. [0000-0002-8654-7386], Nufer, Sebastian, Fantanas, Dimitrios, Ogilvie, Sean P., Large, Matthew J., Winterauer, Dominik J., Salvage, Jonathan P., Meloni, Manuela, King, Alice A. K., Schellenberger, Pascale, Shmeliov, Aleksey, Víctor-Román, Sandra, Peláez-Fernández, Mario, Nicolosi, Valeria, Arenal, Raúl, Benito, Ana M., Maser, Wolfgang K., Brunton, Adam, and Dalton, Alan B.

Abstract

Carbon nanofoam (CNF) is a low-density, high-surface-area material formed by aggregation of amorphous carbon nanoparticles into porous nanostructures. We report the use of a pulsed infrared laser to prepare CNF from a graphene oxide (GO) target material. Electron microscopy shows that the films consist of dendritic strings that form web-like three-dimensional structures. The conductivity of these structures can be modified by using the CNF as a nanostructured scaffold for gold nanoparticles deposited by sputter coating, controllably increasing the conductivity by up to 4 orders of magnitude. The ability to measure the conductivity of the porous structures allows electrochemical measurements in the environment. Upon decreasing humidity, the pristine CNF exhibits an increase in resistance with a quick response and recovery time. By contrast, the gold-sputtered CNF showed a decrease in resistance, indicating modification of the doping mechanism due to water adsorption. The sensitivity to humidity is eliminated at the percolation threshold of the metal on the CNF.

Published
2018

37. Mechanochromic and Thermochromic Sensors Based on Graphene Infused Polymer Opals

Author

Jurewicz, Izabela, King, Alice A. K., Shanker, Ravi, Large, Matthew J., Smith, Ronan J., Maspero, Ross, Ogilvie, Sean P., Scheerder, Jurgen, Han, Jun, Backes, Claudia, Razal, Joselito M., Florescu, Marian, Keddie, Joseph L., Coleman, Jonathan N., Dalton, Alan B., Jurewicz, Izabela, King, Alice A. K., Shanker, Ravi, Large, Matthew J., Smith, Ronan J., Maspero, Ross, Ogilvie, Sean P., Scheerder, Jurgen, Han, Jun, Backes, Claudia, Razal, Joselito M., Florescu, Marian, Keddie, Joseph L., Coleman, Jonathan N., and Dalton, Alan B.

Abstract

High quality opal-like photonic crystals containing graphene are fabricated using evaporation-driven self-assembly of soft polymer colloids. A miniscule amount of pristine graphene within a colloidal crystal lattice results in the formation of colloidal crystals with a strong angle-dependent structural color and a stop band that can be reversibly shifted across the visible spectrum. The crystals can be mechanically deformed or can reversibly change color as a function of their temperature, hence their sensitive mechanochromic and thermochromic response make them attractive candidates for a wide range of visual sensing applications. In particular, it is shown that the crystals are excellent candidates for visual strain sensors or integrated time-temperature indicators which act over large temperature windows. Given the versatility of these crystals, this method represents a simple, inexpensive, and scalable approach to produce multifunctional graphene infused synthetic opals and opens up exciting applications for novel solution-processable nanomaterial based photonics., Funding Agencies|EPSRCEngineering & Physical Sciences Research Council (EPSRC) [EP/L02263X/1 (EP/M008576/1), EP/M027791/1]

Published
2020
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38. Laser-deposited carbon aerogel derived from graphene oxide enables NO2-selective parts-per-billion sensing

Author

European Commission, Ministerio de Economía y Competitividad (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Gobierno de Aragón, Nufer, Sebastian, Lynch, Peter J., Large, Matthew J., Ogilvie, Sean P., Salvage, Jonathan P., Peláez-Fernández, Mario, Waters, Thomas, Jurewicz, Izabela, Muñoz, Edgar, Arenal, Raúl, Benito, Ana M., Maser, Wolfgang K., Tagmatarchis, Nikos, Ewels, Christopher P., Brunton, Adam, Dalton, Alan B., European Commission, Ministerio de Economía y Competitividad (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Gobierno de Aragón, Nufer, Sebastian, Lynch, Peter J., Large, Matthew J., Ogilvie, Sean P., Salvage, Jonathan P., Peláez-Fernández, Mario, Waters, Thomas, Jurewicz, Izabela, Muñoz, Edgar, Arenal, Raúl, Benito, Ana M., Maser, Wolfgang K., Tagmatarchis, Nikos, Ewels, Christopher P., Brunton, Adam, and Dalton, Alan B.

Abstract

Laser-deposited carbon aerogel is a low-density porous network of carbon clusters synthesized using a laser process. A one-step synthesis, involving deposition and annealing, results in the formation of a thin porous conductive film which can be applied as a chemiresistor. This material is sensitive to NO2 compared to ammonia and other volatile organic compounds and is able to detect ultra-low concentrations down to at least 10 parts-per-billion. The sensing mechanism, based on the solubility of NO2 in the water layer adsorbed on the aerogel, increases the usability of the sensor in practically relevant ambient environments. A heating step, achieved in tandem with a microheater, allows the recovery to the baseline, making it operable in real world environments. This, in combination with its low cost and scalable production, makes it promising for Internet-of-Things air quality monitoring.

Published
2020

41. Charge Transfer Hybrids of Graphene Oxide and the Intrinsically Microporous Polymer PIM-1

Author

Rong, Yuanyang, primary, Large, Matthew J., additional, Tripathi, Manoj, additional, Ogilvie, Sean P., additional, Amorim Graf, Aline, additional, Mao, Boyang, additional, Tunesi, Jacob, additional, Salvage, Jonathan P., additional, King, Alice A. K., additional, Pasquazi, Alessia, additional, Peccianti, Marco, additional, Malpass-Evans, Richard, additional, McKeown, Neil B., additional, Marken, Frank, additional, and Dalton, Alan B., additional

Published
2019
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42. Size selection of liquid-exfoliated 2D nanosheets

Author

Ogilvie, Sean P, primary, Large, Matthew J, additional, O’Mara, Marcus A, additional, Lynch, Peter J, additional, Lee, Cheuk Long, additional, King, Alice A K, additional, Backes, Claudia, additional, and Dalton, Alan B, additional

Published
2019
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43. Novel materials for optoelectronic devices: Conjugated polymer nanoparticle-graphene oxide charge-transfer complexes

Author

Maser, Wolfgang K., Istif, Emin, Hernández-Ferrer, Javier, Urriolabeitia, Esteban P., Stergiou, Anastasios, Tagmatarchis, Nikos, Fratta, Giuseppe, Colchero, J., Palacios-Lidón, E., Kalbáč, Martin, Large, Matthew J., Dalton, Alan B., Benito, Ana M., Ministerio de Economía, Industria y Competitividad (España), European Commission, Gobierno de Aragón, and Ministerio de Economía y Competitividad (España)

Abstract

Resumen del trabajo presentado al Nano Application Workshop, celebrado en Munich (Alemania) del 19 al 21 de septiembre de 2018., Conjugated polymers (CPs) constitute the base of organic thin film optoelectronic devices, such as organic photovoltaic solar cells (OSCs) and organic light emitting devices (OLEDs). Deposited onto large areas of any shape they critically contribute to the development of self-powered, smart and ubiquitous communication platforms. Operational performance and fabrication from 'green' solutions compatible with large-area coating or printing technologies are key requirements for their commercial implementation. Applying self-assembly strategies, CPs can be prepared in the form of water dispersible nanoparticles being of actual interest for achieving improved device performance. In this work we present novel pathways for the design of improved organic thin film optoelectronic devices by marrying nanoparticles of CPs (CPNPs) with 2D sheets of graphene oxide (GO). Using poly(3-hexylthiophene) (P3HT) as benchmark CP, we demonstrate the game-changing role of GO in tuning the excitonic aggregate behavior of P3HTNPs and the efficient formation P3HTNPs-GO charge-transfer complexes. Thin films thereof reveal improved separation of photo-generated charge carriers. Integration into a photoelectrochemical device shows significantly improved photoactivity. Moreover, the thin films reveal unique molecular switching behavior. The possibility to overcome external performance limitations and to employ 'green' processing technologies offers exciting possibilities for further progress in the field of organic thin film optoelectronic devices., EU Horizon 2020 Marie Sklodowska-Curie grant 642742 ("Enabling Excellence"), Spanish Ministry MINEICO (ENE2016-79282-C5-1-R), Government of Aragón (Recognized Group DGA-T03-17R).

Published
2018

44. Self-assembled poly (3-hexylthiophene) nanoparticles / graphene oxide donor-acceptor hybrids with tunable optoelectronic properties

Author

Istif, Emin, Hernández-Ferrer, Javier, Urriolabeitia, Esteban P., Stergiou, Anastasios, Tagmatarchis, Nikos, Fratta, Giuseppe, Large, Matthew J., Dalton, Alan B., Benito, Ana M., and Maser, Wolfgang K.

Abstract

Resumen del trabajo presentado al ChemOnTubes, International meeting on the chemistry of graphene and carbon nanotubes, celebrado en Biarritz (Francia) del 22 al 26 de abril de 2018.

Published
2018

45. Sonochemical edge functionalisation of molybdenum disulfide

Author

Amorim Graf, Aline, primary, Large, Matthew J., additional, Ogilvie, Sean P., additional, Rong, Yuanyang, additional, Lynch, Peter J., additional, Fratta, Giuseppe, additional, Ray, Santanu, additional, Shmeliov, Aleksey, additional, Nicolosi, Valeria, additional, Arenal, Raul, additional, King, Alice A. K., additional, and Dalton, Alan B., additional

Published
2019
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46. Cell–Substrate Interactions Lead to Internalization and Localization of Layered MoS2 Nanosheets.

Author

Harries, Rhiannon W., Brown, Christopher J., Woodbine, Lisa, Amorim Graf, Aline, Large, Matthew J., Clifford, Keiran, Lynch, Peter J., Ogilvie, Sean P., Dalton, Alan B., and King, Alice A. K.

Abstract

Using an ultrathin film substrate, the first internalization of MoS2 nanosheets through mechanotransduction is demonstrated. The usual method of dispersing nanomaterials in the media limits interactions to random, serendipitous surface contact, and the nanoparticles must be dispersible in media. A substrate approach means that cells directly engage with the nanomaterial, sensing and adhering through sustained interaction and actively internalizing the nanomaterial. This activates previously unobserved cell–substrate mechanotransduction mechanisms and receptor-mediated uptake pathways. Moreover, a wide variety of nonsoluble nanomaterials can be used, improving control over the amount of material exposed to a cell through tunable deposition density. Volumetric Raman mapping demonstrates localization of material to the endoplasmic reticulum, a historically hard-to-target region. The nanosheets do not cause cytotoxicity, are transferred to daughter cells, and have applicability across multiple cell lines. The innate fluorescence or Raman signal of the nanosheet can be utilized for live cell imaging, and targeted accumulation within specific cellular organelles offers potential for photothermal treatments or drug delivery vectors. This substrate-mediated approach provides a step change to studying nanomaterial–cellular interactions, taking advantage of the broad palette of available two-dimensional (2D) materials and making use of mechanosensing to stimulate tunable responses, with potential for therapies and diagnostics. [ABSTRACT FROM AUTHOR]

Published
2021
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