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391 results on '"Giansante, Carlo"'

1. Temporal Evolution of Self-Assembled Lead Halide Perovskite Nanocrystal Superlattices: Effects on Photoluminescence and Energy Transfer

Author

Baranov, Dmitry, Fieramosca, Antonio, Yang, Ruo Xi, Polimeno, Laura, Lerario, Giovanni, Toso, Stefano, Giansante, Carlo, De Giorgi, Milena, Tan, Liang Z., Sanvitto, Daniele, and Manna, Liberato

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

Excitonic/electronic coupling and cooperative interactions in self-assembled lead halide perovskite nanocrystals were reported to give rise to a collective low energy emission peak with accelerated dynamics. Here we report that similar spectroscopic features could appear as a result of the nanocrystal reactivity within the self-assembled superlattices. This is demonstrated by using CsPbBr3 nanocrystal superlattices under room temperature and cryogenic micro-photoluminescence spectroscopy. It is shown that keeping such structures under vacuum, a gradual contraction of the superlattices and subsequent coalescence of the nanocrystals occurs over several days. As a result, a narrow, low energy emission peak is observed at 4 K with a concomitant shortening of the photoluminescence lifetime due to the energy transfer between nanocrystals. When exposed to air, self-assembled CsPbBr3 nanocrystals develop bulk-like CsPbBr3 particles on top of the superlattices. At 4 K, these particles produce a distribution of narrow, low energy emission peaks with short lifetimes and excitation fluence-dependent, oscillatory decays, resembling the features of superfluorescence. Overall, the reactivity of CsPbBr3 nanocrystals dramatically alters the emission of their assemblies, which should not be overlooked when studying collective optoelectronic properties nor confused with superfluorescence effects., Comment: 50 pages, 26 figures

Published
2020
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2. Aging of Self-Assembled Lead Halide Perovskite Nanocrystal Superlattices: Effects on Photoluminescence and Energy Transfer

Author

Baranov, Dmitry, Fieramosca, Antonio, Yang, Ruo Xi, Polimeno, Laura, Lerario, Giovanni, Toso, Stefano, Giansante, Carlo, De Giorgi, Milena, Tan, Liang Z, Sanvitto, Daniele, and Manna, Liberato

Subjects
Macromolecular and Materials Chemistry, Chemical Sciences, Physical Chemistry, Affordable and Clean Energy, perovskite nanocrystals, self-assembly, nanocrystal superlattices, environmental stability, reactivity, low-temperature photoluminescence, energy transfer, physics.app-ph, cond-mat.mes-hall, cond-mat.mtrl-sci, Nanoscience & Nanotechnology
Abstract

Excitonic coupling, electronic coupling, and cooperative interactions in self-assembled lead halide perovskite nanocrystals were reported to give rise to a red-shifted collective emission peak with accelerated dynamics. Here we report that similar spectroscopic features could appear as a result of the nanocrystal reactivity within the self-assembled superlattices. This is demonstrated by studying CsPbBr3 nanocrystal superlattices over time with room-temperature and cryogenic micro-photoluminescence spectroscopy, X-ray diffraction, and electron microscopy. It is shown that a gradual contraction of the superlattices and subsequent coalescence of the nanocrystals occurs over several days of keeping such structures under vacuum. As a result, a narrow, low-energy emission peak is observed at 4 K with a concomitant shortening of the photoluminescence lifetime due to the energy transfer between nanocrystals. When exposed to air, self-assembled CsPbBr3 nanocrystals develop bulk-like CsPbBr3 particles on top of the superlattices. At 4 K, these particles produce a distribution of narrow, low-energy emission peaks with short lifetimes and excitation fluence-dependent, oscillatory decays. Overall, the aging of CsPbBr3 nanocrystal assemblies dramatically alters their emission properties and that should not be overlooked when studying collective optoelectronic phenomena nor confused with superfluorescence effects.

Published
2021

3. There's Plenty of Surface at the Bottom: Surface Chemistry Enhances Light Absorption by Colloidal Semiconductor Nanocrystals

Author

Giansante, Carlo

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

The paraphrasis of Feynman's statement is used to highlight the inherent relevance of surfaces -- and interfaces -- at the nanoscale. Here, the marked impact of the surface chemistry on the light absorption by colloidal inorganic semiconductor nanocrystals is discussed and demonstrated as general. Chemical species at the surface (ligands) of colloidal metal chalcogenide quantum dots (QDs) are shown to induce broadband absorption enhancement and band gap reduction. A comprehensive library of chalcogenol(ate) ligands is exploited to infer the role of surface chemistry on the QD optical absorption properties: ligand chalcogen binding atoms mainly determine band gap reduction, related to np occupied orbital contribution to the valence band edge, and mediates broadband absorption enhancement, fostered by the conjugation of the ligand pendant moiety, with further contribution from electron donor substituents. These findings point to a description of colloidal QDs that may conceive ligands as part of the overall QD electronic structure, beyond common models derived from analogies with core/shell heterostructures depicting ligands as mere perturbation to the core properties.

Published
2018

4. UV Light Detection from CdS Nanocrystal Sensitized Graphene Photodetectors at kHz Frequencies

Author

Spirito, Davide, Kudera, Stefan, Miseikis, Vaidotas, Giansante, Carlo, Coletti, Camilla, and Krahne, Roman

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

We have fabricated UV-sensitive photodetectors based on colloidal CdS nanocrystals and graphene. The nanocrystals act as a sensitizer layer that improves light harvesting leading to high responsivity of the detector. Despite the slow relaxation of the photogenerated charges in the nanocrystal film, faster processes allowed to detect pulses up to a repetition rate of 2 kHz. We have performed time-resolved analysis of the processes occurring in our hybrid system, and discuss possible photo-induced charge transfer mechanisms., Comment: 11 pages, 5 figures

Published
2018
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9. Polariton Induced Enhanced Emission from an Organic Dye under Strong Coupling Regime

Author

Ballarini, Dario, De Giorgi, Milena, Gambino, Salvatore, Lerario, Giovanni, Mazzeo, Marco, Genco, Armando, Accorsi, Gianluca, Giansante, Carlo, Colella, Silvia, D'Agostino, Stefania, Cazzato, Paolo, Sanvitto, Daniele, and Gigli, Giuseppe

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Exciton-polaritons in semiconductors are quasi-particles which have recently shown the capability to undergo phase transition into a coherent hybrid state of light and matter. The observation of such quasi-particles in organic microcavities has attracted increasing attention for their characteristic of reaching condensation at room temperature. In this work we demonstrate that the emission properties of organic polaritons do not depend on the overlap between the absorption and emission states of the molecule and that the emission dynamics are modified in the strong coupling regime, showing a significant enhancement of the photoluminescence intensity as compared to the bare dye. This paves the way to the investigation of molecules with large absorption coefficients but poor emission efficiencies for the realization of polariton condensates and organic electrically injected lasers by exploiting strong exciton-photon coupling regimes.

Published
2014
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10. Molecular-Level Switching of Polymer/Nanocrystal Non-Covalent Interactions and Application in Hybrid Solar Cells

Author

Giansante, Carlo, Mastria, Rosanna, Lerario, Giovanni, Moretti, Luca, Kriegel, Ilka, Scotognella, Francesco, Lanzani, Guglielmo, Carallo, Sonia, Esposito, Marco, Biasiucci, Mariano, Rizzo, Aurora, and Gigli, Giuseppe

Subjects
Condensed Matter - Materials Science
Abstract

Hy brid composites obtained upon blending conjugated polymers and colloidal inorganic semiconductor nanocrystals are regarded as attractive photo-active materials for optoelectronic applications. Here we demonstrate that tailoring nanocrystal surface chemistry permits to exert control on non-covalent bonding and electronic interactions between organic and inorganic components. The pendant moieties of organic ligands at the nanocrystal surface do not merely confer colloidal stability while hindering charge separation and transport, but drastically impact morphology of hybrid composites during formation from blend solutions. The relevance of our approach to photovoltaic applications is demonstrated for composites based on poly(3-hexylthiophene) and Pbs nanocrystals, considered as inadequate before the submission of this manuscript, which enable the fabrication of hybrid solar cells displaying a power conversion efficiency that reaches 3 %. Upon (quasi)steady-state and time-resolved analisys of the photo-induced processes in the nanocomposites and their organic and inorganic components, we ascertained that electron transfer occurs at the hybrid interface yielding long-lived separated charge carriers, whereas interfacial hole transfer appears slow. Here we provide a reliable alternative aiming at gaining control over macroscopic optoelectronic properties of polymer/nanocrystal composites by acting at the molecular-level via ligands' pendant moieties, thus opening new possibilities towards efficient solution-processed hybrid solar cells.

Published
2013
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11. NADH Photoregeneration in a Fully Automated Microfluidic Setup

Author

Bianco, Alberto, McMillan, Alexander H., Giansante, Carlo, and Bergamini, Giacomo

Abstract

Enzyme catalysis is a powerful tool in chemical transformations, with the potential to aid the transition from fossil fuels to alternative energy carries. However, the application of enzymes is hindered by reduced cofactors’ high cost. This work focuses on efficient cofactor regeneration, exploring a photochemical approach inspired by natural photosynthesis. Utilizing mixed valence Bi13S18Br2nanocrystals as photoactive catalysts, triethanolamine (TEOA) was photo-oxidized to glycolaldehyde, crucial for β-nicotinamide adenine dinucleotide (NAD+) reduction. Batch and microfluidic systems were employed, emphasizing the role of molecular oxygen in TEOA light-driven and auto-oxidation mechanisms. Indeed, the introduction of oxygen microbubbles in the microfluidic system significantly enhanced TEOA autocatalytic oxidative mechanism leading to a fivefold increase in NADH production compared to batch methods. To streamline the process and minimize operator intervention, a fully automated microfluidic system was designed, demonstrating excellent stability and reproducibility. This work provides a practical, automated, and scalable platform for real-world applications.

Published
2024
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12. Direct Band Gap Chalcohalide Semiconductors: Quaternary AgBiSCl2 Nanocrystals

Author

Quarta, Danila, primary, Toso, Stefano, additional, Fieramosca, Antonio, additional, Dominici, Lorenzo, additional, Caliandro, Rocco, additional, Moliterni, Anna, additional, Tobaldi, David Maria, additional, Saleh, Gabriele, additional, Gushchina, Irina, additional, Brescia, Rosaria, additional, Prato, Mirko, additional, Infante, Ivan, additional, Cola, Adriano, additional, Giannini, Cinzia, additional, Manna, Liberato, additional, Gigli, Giuseppe, additional, and Giansante, Carlo, additional

Published
2023
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14. Mixed Valence of Bismuth in Hexagonal Chalcohalide Nanocrystals

Author

Quarta, Danila, primary, Toso, Stefano, additional, Saleh, Gabriele, additional, Caliandro, Rocco, additional, Moliterni, Anna, additional, Griesi, Andrea, additional, Divitini, Giorgio, additional, Infante, Ivan, additional, Gigli, Giuseppe, additional, Giannini, Cinzia, additional, Manna, Liberato, additional, and Giansante, Carlo, additional

Published
2023
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19. Derivation and Validation of a Biomarker-Based Clinical Algorithm to Rule Out Sepsis From Noninfectious Systemic Inflammatory Response Syndrome at Emergency Department Admission: A Multicenter Prospective Study*

Author

Mearelli, Filippo, Fiotti, Nicola, Giansante, Carlo, Casarsa, Chiara, Orso, Daniele, De Helmersen, Marco, Altamura, Nicola, Ruscio, Maurizio, Castello, Luigi Mario, Colonetti, Efrem, Marino, Rossella, Barbati, Giulia, Bregnocchi, Andrea, Ronco, Claudio, Lupia, Enrico, Montrucchio, Giuseppe, Muiesan, Maria Lorenza, Di Somma, Salvatore, Avanzi, Gian Carlo, and Biolo, Gianni

Published
2018
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21. Colloidal Bismuth Chalcohalide Nanocrystals

Author

Quarta, Danila, primary, Toso, Stefano, additional, Giannuzzi, Roberto, additional, Caliandro, Rocco, additional, Moliterni, Anna, additional, Saleh, Gabriele, additional, Capodilupo, Agostina‐Lina, additional, Debellis, Doriana, additional, Prato, Mirko, additional, Nobile, Concetta, additional, Maiorano, Vincenzo, additional, Infante, Ivan, additional, Gigli, Giuseppe, additional, Giannini, Cinzia, additional, Manna, Liberato, additional, and Giansante, Carlo, additional

Published
2022
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23. Genetic Variants of Matrix Metalloproteinase and Sepsis: The Need Speed Study

Author

Fiotti, Nicola, primary, Mearelli, Filippo, additional, Di Girolamo, Filippo Giorgio, additional, Castello, Luigi Mario, additional, Nunnari, Alessio, additional, Di Somma, Salvatore, additional, Lupia, Enrico, additional, Colonetti, Efrem, additional, Muiesan, Maria Lorenza, additional, Montrucchio, Giuseppe, additional, Giansante, Carlo, additional, Avanzi, Gian Carlo, additional, and Biolo, Gianni, additional

Published
2022
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38. Host-guest complexes between an aromatic molecular tweezer and symmetric and unsymmetric dendrimers with a 4,4'-bipyridinium core

Author

Balzani, Vincenzo, Bandmann, Heinz, Ceroni, Paola, Giansante, Carlo, Hahn, Uwe, Klarner, Frank-Gerrit, Muller, Ute, Muller, Walter M., Verhaelen, Carla, Vicinelli, Veronoca, and Vogtle, Fritz

Subjects
Dendrimers -- Chemical properties, Dendrimers -- Atomic properties, Electron donor-acceptor complexes -- Research, Pyridinium compounds -- Chemical properties, Pyridinium compounds -- Atomic properties, Chemistry
Abstract

The spectroscopic and electrochemical behavior of the symmetric and unsymmetric first-, second-, and third-generation dendrimers (Dn)(sub 2)B(super 2+) (symmetric dendrimers) and DnB(super 2+) (unsymmetric dendrimers) (n = 1,2,3) and their host-guest complexes with tweezer T is investigated. The host-guest complexes between the tweezer and the dendrimers are stabilized by electron donor-acceptor interactions and can be reversibly assembled or disassembled by electrochemical stimulation.

Published
2006

39. Aging of Self-Assembled Lead Halide Perovskite Nanocrystal Superlattices: Effects on Photoluminescence and Energy Transfer

Author

Baranov, Dmitry, primary, Fieramosca, Antonio, additional, Yang, Ruo Xi, additional, Polimeno, Laura, additional, Lerario, Giovanni, additional, Toso, Stefano, additional, Giansante, Carlo, additional, Giorgi, Milena De, additional, Tan, Liang Z., additional, Sanvitto, Daniele, additional, and Manna, Liberato, additional

Published
2020
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43. The Integration of qSOFA with Clinical Variables and Serum Biomarkers Improves the Prognostic Value of qSOFA Alone in Patients with Suspected or Confirmed Sepsis at ED Admission

Author

Mearelli, Filippo, primary, Barbati, Giulia, additional, Casarsa, Chiara, additional, Giansante, Carlo, additional, Breglia, Andrea, additional, Spica, Andrea, additional, Moras, Cristina, additional, Olivieri, Gaia, additional, Occhipinti, Alessandro Agostino, additional, De Nardo, Margherita, additional, Spagnol, Francesca, additional, Fiotti, Nicola, additional, Di Girolamo, Filippo Giorgio, additional, Ruscio, Maurizio, additional, Castello, Luigi Mario, additional, Colonetti, Efrem, additional, Marino, Rossella, additional, Ronco, Claudio, additional, Zanetti, Michela, additional, Lupia, Enrico, additional, Muiesan, Maria Lorenza, additional, Di Somma, Salvatore, additional, Avanzi, Gian Carlo, additional, and Biolo, Gianni, additional

Published
2020
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46. CONTRIBUTORS

Author

Ahooja, Vineeta, primary, Ajay, Vamadevan S., additional, Amar, Laurence, additional, Appel, Lawrence J., additional, Azizi, Michel, additional, Bakris, George L., additional, Bazzano, Lydia A., additional, Beevers, D. Gareth, additional, Beilin, Lawrence J., additional, Blann, Andrew D., additional, Boegehold, Matthew A., additional, Booz, George W., additional, Braam, Branko, additional, Brandon, Elizabeth L., additional, Brands, Michael W., additional, Britton, Mark, additional, Brunner, Hans R., additional, Burke, Beverley, additional, Burke, Valerie, additional, Cappuccio, Francesco P., additional, Carey, Robert M., additional, Carter, Barry L., additional, Caulfield, Mark J., additional, Chen, Yuqing, additional, Cohn, Jay N., additional, Connell, John M.C., additional, Cox, Anthony, additional, Das, Madhusudan, additional, Davy, Kevin P., additional, Dennison, Cheryl R., additional, Sarkissian, Shant Der, additional, Díez, Javier, additional, Doris, Peter A., additional, Drummond, Heather A., additional, Duprez, Daniel A., additional, Elijovich, Fernando, additional, Elliott, Henry L., additional, Elliott, William J., additional, Eveson, David J., additional, Fink, Gregory D., additional, Fiotti, Nicola, additional, Flack, John M., additional, Flynn, Joseph T., additional, Foëx, Pierre, additional, Fortepiani, Lourdes A., additional, Fotherby, Martin D., additional, Fouad-Tarazi, Fetnat, additional, Franklin, Stanley S., additional, Friese, Ryan, additional, Funder, John W., additional, Galligan, James J., additional, Garvin, Jeffrey L., additional, Gentile, Christopher L., additional, George, Jacob, additional, Ghiadoni, Lorenzo, additional, Giansante, Carlo, additional, Gilbert, Richard E., additional, Gomez, Sabas I., additional, Gradman, Alan H., additional, Granger, Joey P., additional, Grassi, Guido, additional, Greenland, Philip, additional, Grossman, Ehud, additional, Gungadoo, Johannie, additional, Haas, John A., additional, Hahn, Peter Y., additional, Hall, John E., additional, Hamilton, Bruce A., additional, Haywood, Joseph R., additional, He, Jiang, additional, Herrera, Marcela, additional, Hill, Martha N., additional, Iliescu, Radu, additional, Isles, Chris, additional, Izzo, Joseph L., additional, Jaumdally, Rumi, additional, Jones, Daniel W., additional, Kearney, Patricia M., additional, Koomans, Hein A., additional, Krasuski, Richard A., additional, Krum, Henry, additional, Laffer, Cheryl L., additional, Lang, Chim C., additional, Langford, Nigel J., additional, Lawlor, Debbie A., additional, Lee, Dexter L., additional, Lévy, Bernard I., additional, Link, Daniel, additional, Lip, Gregory Y.H., additional, Lipkin, Graham W., additional, Lloyd-Jones, Donald M., additional, Lohmeier, Thomas E., additional, Loughrey, Brona V., additional, MacDonald, Thomas M., additional, MacFadyen, Robert J., additional, Mahata, Sushil K., additional, Mancia, Giuseppe, additional, Marçano, Ana Carolina B., additional, Martin, Jennifer, additional, McGiff, John C., additional, McInnes, Gordon T., additional, Messerli, Franz H., additional, Miller, Steven M., additional, Mitchell, Paul, additional, Moore, Jason, additional, Mori, Trevor A., additional, Moser, Marvin, additional, Mugo, Maryann N., additional, Munroe, Patricia B., additional, Naik, Nitish, additional, Nasser, Samar A., additional, Newhouse, Stephen J., additional, Ng, Leong L., additional, Northcott, Carrie A., additional, O'Connor, Shannon M., additional, O'Connor, Daniel T., additional, Oparil, Suzanne, additional, Ortiz, Pablo A., additional, Panjrath, Gurusher S., additional, Parthasarathy, Hari Krishnan, additional, Perry, Ivan J., additional, Pickering, Thomas G., additional, Plouin, Pierre-François, additional, Prabhakaran, Dorairaj, additional, Puddey, Ian B., additional, Quilley, John, additional, Raizada, Mohan K., additional, Rao, Fangwen, additional, Reckelhoff, Jane F., additional, Reddy, Kolli Srinath, additional, Rizzoni, Damiano, additional, Robertson, J. Ian S., additional, Robinson, Thompson G., additional, Romero, J. Carlos, additional, Rosei, Enrico Agabiti, additional, Rosenthal, Talma, additional, Rosskopf, Dieter, additional, Ryan, Michael J., additional, Safar, Michel E., additional, Salvetti, Antonio, additional, Sarafidis, Panteleimon A., additional, Sartori-Valinotti, Julio C., additional, Schork, Nicholas J., additional, Setaro, John F., additional, Shah, N.C., additional, Shiel, Julian, additional, Schiffrin, Ernesto L., additional, Sica, Domenic A., additional, Silva, Alexandre A. da, additional, Silva, Guillermo B., additional, Silva, J. Enrique, additional, Smith, George Davey, additional, Somers, Virend K., additional, Sowers, James R., additional, Spence, J. David, additional, Stanley, Adrian G., additional, Stec, David E., additional, Stranges, Saverio, additional, Struthers, Allan D., additional, Stump, Craig S., additional, Tabet, Fatiha, additional, Taddei, Stefano, additional, Taupenot, Laurent, additional, Tayebjee, Muzahir H., additional, Teixeira, Cleber E., additional, Thakali, Keshari M., additional, Touyz, Rhian M., additional, Traub, Darren, additional, Tse, Hung-Fat, additional, Umans, Jason G., additional, Uthappa, Puchimada, additional, Valina-Toth, Anna B., additional, Varughese, George I., additional, Virdis, Agostino, additional, Watts, Stephanie W., additional, Webb, R. Clinton, additional, Wen, Gen, additional, Whelton, Paul K., additional, Whitworth, Judith A., additional, Wong, Tien Yin, additional, Woodham, Ryan M., additional, Wyne, Kathleen, additional, Yanes, Licy Lorena, additional, Ying, Zhekang, additional, Young, Ian S., additional, Zanchetti, Alberto, additional, Zhang, Kuixing, additional, Zhang, Lian, additional, and Ziegler, Michael G., additional

Published
2007
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