Transparent and conductive films from liquid phase exfoliated graphene

Tomašević-Ilić, Tijana; Pešić, Jelena; Milošević, Ivana; Vujin, Jasna; Matković, Aleksandar; Spasenović, Marko; Gajić, Radoš

doi:10.1007/s11082-016-0591-1

Cited by 23 publications

(23 citation statements)

References 21 publications

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“…However, all self-assembled films suffer from a large density of defects that often leads to a high sheet resistance of deposited film. Conversely, the large defect density offers an opportunity for surface treatment such as annealing, chemical doping and functionalization [3,12], all of which can reduce sheet resistance or produce other desirable effects. The susceptibility of a film to treatment as well as its initial sheet resistance depend on the nature of the prevalent defects, such as impurities, vacancies, nanoplatelet edges, and topological defects, as well as the defect density.…”

Section: Introductionmentioning

confidence: 99%

Reducing sheet resistance of self-assembled transparent graphene films by defect patching and doping with UV/ozone treatment

Tomašević-Ilić

Jovanović

Popov

et al. 2018

Applied Surface Science

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Highlights Photochemical oxidation (UV/ozone treatment) of self-assembled solution-processed graphene films is demonstrated for the first time  The effect that photochemical oxidation has on self-assembled graphene films is a reduction of sheet resistance, the opposite of the earlier reported effect on CVD or mechanically exfoliated graphene  Edges as the dominant defect type in self-assembled graphene films play a crucial role in the presented defect density decrease  Photochemical oxidation is proposed as a method of increasing the carrier mean free path, doping, and lowering sheet resistance of solution-processed graphene films Abstract Liquid phase exfoliation followed by Langmuir-Blodgett self-assembly (LBSA) is a promising method for scalable production of thin graphene films for transparent conductor applications.However, monolayer assembly into thin films often induces a high density of defects, resulting in a large sheet resistance that hinders practical use. We introduce UV/ozone as a novel photochemical treatment that reduces sheet resistance of LBSA graphene threefold, while preserving the high optical transparency. The effect of such treatment on our films is opposite to the effect it has on mechanically exfoliated or CVD films, where UV/ozone creates additional defects in the graphene plane, increasing sheet resistance. Raman scattering shows that exposure to UV/ozone reduces the defect density in LBSA graphene, where edges are the dominant defect type. FTIR spectroscopy indicates binding of oxygen to the graphene lattice during exposure to ozone. In addition, work function measurements reveal that the treatment dopes the LBSA film, making it more conductive. Such defect patching paired with doping leads to an accessible way of improving the transparent conductor performance of LBSA graphene, making solution-processed thin films a candidate for industrial use.

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Section: Introductionmentioning

confidence: 99%

Reducing sheet resistance of self-assembled transparent graphene films by defect patching and doping with UV/ozone treatment

Tomašević-Ilić

Jovanović

Popov

et al. 2018

Applied Surface Science

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“…This was later shown by Hernandez et al [37], who tested 40 different solvents for graphene. Unfortunately, many of these organic solvents possess high boiling points, making them hard to remove after dispersion [34,35,[40][41][42][43]. Fig.…”

Section: Liquid Exfoliationmentioning

confidence: 99%

Review of fabrication methods of large-area transparent graphene electrodes for industry

Mustonen

Mackenzie

Lipsanen

2020

Front. Optoelectron.

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Graphene is a two-dimensional material showing excellent properties for utilization in transparent electrodes; it has low sheet resistance, high optical transmission and is flexible. Whereas the most common transparent electrode material, tin-doped indium-oxide (ITO) is brittle, less transparent and expensive, which limit its compatibility in flexible electronics as well as in low-cost devices. Here we review two large-area fabrication methods for graphene based transparent electrodes for industry: liquid exfoliation and low-pressure chemical vapor deposition (CVD). We discuss the basic methodologies behind the technologies with an emphasis on optical and electrical properties of recent results. State-of-the-art methods for liquid exfoliation have as a figure of merit an electrical and optical conductivity ratio of 43:5, slightly over the minimum required for industry of 35, while CVD reaches as high as 419.

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“…Coleman [22] 在NMP中剥离得到浓度约为0.01 mg mL −1 的石墨烯分散液以来, 异丙醇(IPA) [23] 、N,N′-二甲基甲酰胺(DMF) [ 2 4 ] 、邻二氯苯(o-DCB) [ 2 5 ] 、γ-丁内酯 (GBL) [19] 、N,N′-二甲基乙酰胺(DMA) [26] 、氯仿 [27] 等有机溶剂均被应用到液相剥离中来. Hernandez等 [19] [28] , Hansen溶解度参数可用来预测纳米材料在液体中的分散性.…”

Section: 传统的剥离溶剂是从有机溶剂开始的自2009年unclassified

Application of ionic liquids on green exfoliation preparation of graphene in large scale

Wu¹,

Yan²

2018

Sci. Sin.-Chim

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The preparation of supported ionic liquids (SILs) and their application in rare metals separation SCIENCE CHINA Chemistry 55, 1479 (2012); a novel family of green ionic liquids with surface activities Science in China Series B-Chemistry 50, 238 (2007); Research progress in preparation of graphene and its composites based on ionic liquids SCIENTIA SINICA Chimica 46, 1277 (2016); Ionic liquids as green reaction media for synthesis of poly(aryl ether ketone)s

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Transparent and conductive films from liquid phase exfoliated graphene

Cited by 23 publications

References 21 publications

Reducing sheet resistance of self-assembled transparent graphene films by defect patching and doping with UV/ozone treatment

Reducing sheet resistance of self-assembled transparent graphene films by defect patching and doping with UV/ozone treatment

Review of fabrication methods of large-area transparent graphene electrodes for industry

Application of ionic liquids on green exfoliation preparation of graphene in large scale

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