Single-step fabrication and work function engineering of Langmuir-Blodgett assembled few-layer graphene films with Li and Au salts

Abstract To implement large-area solution-processed graphene films in low-cost transparent conductor applications, it is necessary to have the control over the work function (WF) of the film. In this study we demonstrate a straightforward single-step chemical approach for modulating the work functio...

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Autores principales:	Ivana R. Milošević, Borislav Vasić, Aleksandar Matković, Jasna Vujin, Sonja Aškrabić, Markus Kratzer, Thomas Griesser, Christian Teichert, Radoš Gajić
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b1adb936185f48739904a6b637ae616c
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spelling	oai:doaj.org-article:b1adb936185f48739904a6b637ae616c2021-12-02T14:59:12ZSingle-step fabrication and work function engineering of Langmuir-Blodgett assembled few-layer graphene films with Li and Au salts10.1038/s41598-020-65379-12045-2322https://doaj.org/article/b1adb936185f48739904a6b637ae616c2020-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-65379-1https://doaj.org/toc/2045-2322Abstract To implement large-area solution-processed graphene films in low-cost transparent conductor applications, it is necessary to have the control over the work function (WF) of the film. In this study we demonstrate a straightforward single-step chemical approach for modulating the work function of graphene films. In our approach, chemical doping of the film is introduced at the moment of its formation. The films are self-assembled from liquid-phase exfoliated few-layer graphene sheet dispersions by Langmuir-Blodgett technique at the water-air interfaces. To achieve a single-step chemical doping, metal standard solutions are introduced instead of water. Li standard solutions (LiCl, LiNO3, Li2CO3) were used as n-dopant, and gold standard solution, H(AuCl4), as p-dopant. Li based salts decrease the work function, while Au based salts increase the work function of the entire film. The maximal doping in both directions yields a significant range of around 0.7 eV for the work function modulation. In all cases when Li-based salts are introduced, electrical properties of the film deteriorate. Further, lithium nitrate (LiNO3) was selected as the best choice for n-type doping since it provides the largest work function modulation (by 400 meV), and the least influence on the electrical properties of the film.Ivana R. MiloševićBorislav VasićAleksandar MatkovićJasna VujinSonja AškrabićMarkus KratzerThomas GriesserChristian TeichertRadoš GajićNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-12 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ivana R. Milošević Borislav Vasić Aleksandar Matković Jasna Vujin Sonja Aškrabić Markus Kratzer Thomas Griesser Christian Teichert Radoš Gajić Single-step fabrication and work function engineering of Langmuir-Blodgett assembled few-layer graphene films with Li and Au salts
description	Abstract To implement large-area solution-processed graphene films in low-cost transparent conductor applications, it is necessary to have the control over the work function (WF) of the film. In this study we demonstrate a straightforward single-step chemical approach for modulating the work function of graphene films. In our approach, chemical doping of the film is introduced at the moment of its formation. The films are self-assembled from liquid-phase exfoliated few-layer graphene sheet dispersions by Langmuir-Blodgett technique at the water-air interfaces. To achieve a single-step chemical doping, metal standard solutions are introduced instead of water. Li standard solutions (LiCl, LiNO3, Li2CO3) were used as n-dopant, and gold standard solution, H(AuCl4), as p-dopant. Li based salts decrease the work function, while Au based salts increase the work function of the entire film. The maximal doping in both directions yields a significant range of around 0.7 eV for the work function modulation. In all cases when Li-based salts are introduced, electrical properties of the film deteriorate. Further, lithium nitrate (LiNO3) was selected as the best choice for n-type doping since it provides the largest work function modulation (by 400 meV), and the least influence on the electrical properties of the film.
format	article
author	Ivana R. Milošević Borislav Vasić Aleksandar Matković Jasna Vujin Sonja Aškrabić Markus Kratzer Thomas Griesser Christian Teichert Radoš Gajić
author_facet	Ivana R. Milošević Borislav Vasić Aleksandar Matković Jasna Vujin Sonja Aškrabić Markus Kratzer Thomas Griesser Christian Teichert Radoš Gajić
author_sort	Ivana R. Milošević
title	Single-step fabrication and work function engineering of Langmuir-Blodgett assembled few-layer graphene films with Li and Au salts
title_short	Single-step fabrication and work function engineering of Langmuir-Blodgett assembled few-layer graphene films with Li and Au salts
title_full	Single-step fabrication and work function engineering of Langmuir-Blodgett assembled few-layer graphene films with Li and Au salts
title_fullStr	Single-step fabrication and work function engineering of Langmuir-Blodgett assembled few-layer graphene films with Li and Au salts
title_full_unstemmed	Single-step fabrication and work function engineering of Langmuir-Blodgett assembled few-layer graphene films with Li and Au salts
title_sort	single-step fabrication and work function engineering of langmuir-blodgett assembled few-layer graphene films with li and au salts
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/b1adb936185f48739904a6b637ae616c
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Single-step fabrication and work function engineering of Langmuir-Blodgett assembled few-layer graphene films with Li and Au salts

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