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189 results on '"Engquist, Isak"'

1. Digital Cellulose: Recent Advances in Electroactive Paper

Author

Brooke, Robert, primary, Jain, Karishma, additional, Isacsson, Patrik, additional, Fall, Andreas, additional, Engquist, Isak, additional, Beni, Valerio, additional, Wågberg, Lars, additional, Granberg, Hjalmar, additional, Hass, Ursula, additional, and Edberg, Jesper, additional

Published
2024
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6. Redox-tunable structural colour images based on UV-patterned conducting polymers

Author

Chen, Shangzhi, Rossi, Stefano, Shanker, Ravi, Cincotti, Giancarlo, Gamage, Sampath, Kuhne, Philipp, Stanishev, Vallery, Engquist, Isak, Berggren, Magnus, Edberg, Jesper, Darakchieva, Vanya, and Jonsson, Magnus P.

Subjects
Physics - Optics, Condensed Matter - Materials Science, Physics - Applied Physics
Abstract

Precise manipulation of light-matter interaction has enabled a wide variety of approaches to create bright and vivid structural colours. Techniques utilizing photonic crystals, Fabry-P\'erot cavities, plasmonics, or high-refractive index dielectric metasurfaces have been studied for applications ranging from optical coatings to reflective displays. However, complicated fabrication procedures for sub-wavelength nanostructures, limited active areas, and inherent absence of tunability with these approaches significantly impede their further developments towards flexible, large-scale, and switchable devices compatible with facile and cost-effective production. Herein, we present a way to generate structural colours based on conducting polymer thin films prepared on metallic surfaces via vapour phase polymerization and ultraviolet (UV) light patterning. Varying the UV dose leads to synergistic variation of film absorption and thickness, which generates controllable colours from violet to red. Together with greyscale photomasks this enables fabrication of high-resolution colour images using single exposure steps. We further demonstrate spatiotemporal tuning of the structurally coloured surfaces and images via electrochemical modulation of the polymer redox state. The simple structure, facile fabrication, wide colour gamut, and dynamic colour tuning make this concept competitive for future multi-functional and smart displays.

Published
2021

14. Nanocellulose and PEDOT:PSS composites and their applications

Author

Brooke, Robert, primary, Lay, Makara, additional, Jain, Karishma, additional, Francon, Hugo, additional, Say, Mehmet Girayhan, additional, Belaineh, Dagmawi, additional, Wang, Xin, additional, Håkansson, Karl M. O., additional, Wågberg, Lars, additional, Engquist, Isak, additional, Edberg, Jesper, additional, and Berggren, Magnus, additional

Published
2022
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23. Production of energy-storage paper electrodes using a pilot-scale paper machine

Author

Isacsson, Patrik, primary, Jain, Karishma, additional, Fall, Andreas, additional, Chauve, Valerie, additional, Hajian, Alireza, additional, Granberg, Hjalmar, additional, Boiron, Lucie, additional, Berggren, Magnus, additional, Håkansson, Karl, additional, Edberg, Jesper, additional, Engquist, Isak, additional, and Wågberg, Lars, additional

Published
2022
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26. Tunable Structural Color Images by UV‐Patterned Conducting Polymer Nanofilms on Metal Surfaces (Adv. Mater. 33/2021)

Author

Chen, Shangzhi, primary, Rossi, Stefano, additional, Shanker, Ravi, additional, Cincotti, Giancarlo, additional, Gamage, Sampath, additional, Kühne, Philipp, additional, Stanishev, Vallery, additional, Engquist, Isak, additional, Berggren, Magnus, additional, Edberg, Jesper, additional, Darakchieva, Vanya, additional, and Jonsson, Magnus P., additional

Published
2021
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31. Direct Ink Writing of Nanocellulose and PEDOT:PSS for Flexible Electronic Patterned and Supercapacitor Papers.

Author

Lay, Makara, Say, Mehmet Girayhan, and Engquist, Isak

Subjects
ELECTRONIC paper, CARBON nanofibers, ORGANIC electronics, FLEXIBLE electronics, CLEAN energy, ELECTRIC currents, SUPERCAPACITORS
Abstract

Printed electronic paper identifies its interest in flexible organic electronics and sustainable and clean energy applications because of its straightforward production method, cost‐effectiveness, and positive environmental impact. However, current limitations include restricted material thickness and the use of supporting substrate for printing. Here, 2D and 3D electronic patterned paper are fabricated from direct ink writing (DIW) nanocellulose and PEDOT:PSS‐based materials using syringe deposition and 3D printing. The conductor patterns are integrated in the bulk of the paper, while non‐conductive sections are used as support to form free‐standing paper. The strong interface between the patterns of electronic patterned paper gives mechanical stability for practical handling. The conductive paper‐based electrode has 202 S cm−1 and is capable of handling electric current up to 0.7 A, which can be used for high‐power devices. Printed supercapacitor papers show high specific energy of 4.05 Wh kg−1, specific power of 4615 W kg−1 at 0.06 A g−1, and capacitance retention above 95% after 2000 cycles. The new design structure of electronic patterned papers presents a solution for additive manufacturing of paper‐based composites for supercapacitors, wearable electronics, or sensors for smart packaging. [ABSTRACT FROM AUTHOR]

Published
2023
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33. Spray-coated paper supercapacitors

Author

Say, Mehmet Girayhan, primary, Brooke, Robert, additional, Edberg, Jesper, additional, Grimoldi, Andrea, additional, Belaineh, Dagmawi, additional, Engquist, Isak, additional, and Berggren, Magnus, additional

Published
2020
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43. Electrical current modulation in wood electrochemical transistor.

Author

Van Chinh Tran, Mastantuoni, Gabriella G., Zabihipour, Marzieh, Lengwan Li, Berglund, Lars, Berggren, Magnus, Qi Zhou, and Engquist, Isak

Subjects
WOOD, TRANSISTORS, ELECTRIC conductivity, ELECTRONIC equipment, CONDUCTING polymers
Abstract

The nature of mass transport in plants has recently inspired the development of low-cost and sustainable wood-based electronics. Herein, we report a wood electrochemical transistor (WECT) where all three electrodes are fully made of conductive wood (CW). The CW is prepared using a two-step strategy of wood delignification followed by wood amalgamation with a mixed electron-ion conducting polymer, poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT:PSS). The modified wood has an electrical conductivity of up to 69 Sm-1 induced by the formation of PEDOT:PSS microstructures inside the wood 3D scaffold. CW is then used to fabricate the WECT, which is capable of modulating an electrical current in a porous and thick transistor channel (1 mm) with an on/off ratio of 50. The device shows a good response to gate voltage modulation and exhibits dynamic switching properties similar to those of an organic electrochemical transistor. This wood-based device and the proposed working principle demonstrate the possibility to incorporate active electronic functionality into the wood, suggesting different types of bio-based electronic devices. [ABSTRACT FROM AUTHOR]

Published
2023
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44. Nanocellulose and PEDOT:PSS composites and their applications.

Author

Brooke, Robert, Lay, Makara, Jain, Karishma, Francon, Hugo, Say, Mehmet Girayhan, Belaineh, Dagmawi, Wang, Xin, Håkansson, Karl M. O., Wågberg, Lars, Engquist, Isak, Edberg, Jesper, and Berggren, Magnus

Subjects
ELECTROACTIVE substances, BIODEGRADABLE materials, CONDUCTIVE ink, MOLECULAR interactions, ENERGY harvesting, CONDUCTING polymers
Abstract

The need for achieving sustainable technologies has encouraged research on renewable and biodegradable materials for novel products that are clean, green, and environmentally friendly. Nanocellulose (NC) has many attractive properties such as high mechanical strength and flexibility, large specific surface area, in addition to possessing good wet stability and resistance to tough chemical environments. NC has also been shown to easily integrate with other materials to form composites. By combining it with conductive and electroactive materials, many of the advantageous properties of NC can be transferred to the resulting composites. Conductive polymers, in particular poly(3,4-ethylenedioxythiophene:poly(styrene sulfonate) (PEDOT:PSS), have been successfully combined with cellulose derivatives where suspensions of NC particles and colloids of PEDOT:PSS are made to interact at a molecular level. Alternatively, different polymerization techniques have been used to coat the cellulose fibrils. When processed in liquid form, the resulting mixture can be used as a conductive ink. This review outlines the preparation of NC/PEDOT:PSS composites and their fabrication in the form of electronic nanopapers, filaments, and conductive aerogels. We also discuss the molecular interaction between NC and PEDOT:PSS and the factors that affect the bonding properties. Finally, we address their potential applications in energy storage and harvesting, sensors, actuators, and bioelectronics. [ABSTRACT FROM AUTHOR]

Published
2023
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50. Production of energy-storage paper electrodes using a pilot-scale paper machine

Author

Isacsson, Patrik, Jain, karishma, Fall, Andreas, Chauve, Valerie, Hajian, Alireza, Granberg, Hjalmar, Boiron, Lucie, Berggren, Magnus, Engquist, Isak, Edberg, Jesper, and W��gberg, Lars

Abstract

�� Retention laboratory trials �� Whitewater cationic demand �� Thermogravimetric analysis �� Scanning electron microscopy/Energy-dispersive X-ray spectroscopy �� Tensile strength and stiffness �� ��-radiography formation �� Conductivity �� Grammage & thickness �� Grammage �� Electrochemical characterization �� Statistical analysis (two-way ANOVA)

Published
2022
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