Role of Oxygen in the Work Function Modification at Various Stages of Chemically Synthesized Graphene

Mishra, Mukesh; Joshi, Rakesh; Ojha, Sunil; Kanjilal, D.; Mohanty, T.

doi:10.1021/jp406712s

Cited by 24 publications

(35 citation statements)

References 26 publications

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“…The presence of different oxygen functional groups on the GO surface resulted in difference of its WF compared to graphene [147]. Among the different reduction methods of GO, thermal reduction was regularly reported as an effective method in changing the functional groups of GO and recovering the πconjugated structure of graphene sheets along with enhancing the electrical properties of the GO sheets.…”

Section: Effects Of Functional Groups Of Go On Its Work Functionmentioning

confidence: 99%

Tuning the work function of graphene toward application as anode and cathode

Naghdi

Sánchez‐Arriaga

Rhee

2019

Journal of Alloys and Compounds

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The rapid technological progress in the 21 st century demands new multi-functional materials applicable to a wide variety of industries. Two-dimensional (2D) materials are predicted to have a revolutionary impact on the cost, size, weight, and functions of future electronic and optoelectronic devices. Graphene, which shows potential as an alternative to conventional conductive transparent metal oxides, may play a central role. Since its work function (WF) is tunable, graphene exhibits the interesting ability to serve two different roles in electronic and optoelectronic devices, both as an anode and a cathode.After introducing some basic concepts, this work reviews the most important advances in controlling the tuned WF of graphene, highlighting special features of graphene electronic band structure and recognizing different methods for measuring WF. The impact of thickness, type of contact, chemical doping, UV and plasma treatments, defects, and functional groups of graphene oxide are considered and related with the applications of the modulated material. The results of the review, organized in lookup tables, have been used to identify the advantages and main challenges of the tuning methods.

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Section: Effects Of Functional Groups Of Go On Its Work Functionmentioning

confidence: 99%

Tuning the work function of graphene toward application as anode and cathode

Naghdi

Sánchez‐Arriaga

Rhee

2019

Journal of Alloys and Compounds

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“…According to Nair el al., the membranes only allow water vapour to pass through and completely block the vapours of ethanol and other alcohol molecules. In their work, GO was prepared by Hummers Method [38] and then through vigorous ultra-sonication and centrifugation, graphene oxide (GO) sheets with an average size of 1 m were prepared [39][40][41][42][43][44]. In order to make GO membranes, the GO solution can be vacuum filtered in a conventional way on an alumina template support.…”

Section: Go Membranes For Gas Separationmentioning

confidence: 99%

Graphene oxide: the new membrane material

Joshi

Alwarappan

Yoshimura

et al. 2015

Applied Materials Today

425

197

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a b s t r a c tA perfect molecular level separating unit for any kind of species to be filtered is on very high demand. In recent years, graphene oxide has emerged as an important material which can filter ions and molecules. This is an emerging field of research which has drawn extensive attention after the work by Nair et al.[1]. Following their work, various research groups started working in this area in last three years. Herein, we briefly review the recent development on graphene oxide membranes. This review is a summary of some very recent results and contributions made so far in this emerging research field. We have discussed recently developed mechanisms and models to understand the transport through GO based membranes. This review begins with a basic background on membrane technology followed by discussion related to developments of carbon materials based membrane technology. At the end we summarize advantages and disadvantages of membranes based on graphene oxide and discuss their future prospective.

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“…On that basis they projected a significant tunability in the WF of rGO (up to ~2.5 eV) by altering the composition of the oxygen-containing functional groups ( Figure 6 ). Mishra et al [ 119 ] experimentally evaluated the WF of GO as a function of oxygen content. They employed contact surface potential difference (CPD) estimation as an indicator of WF using a scanning Kelvin probe method (SKPM).…”

Section: Work Function and Tuning Of The Work Function Of Graphenementioning

confidence: 99%

Work Function Engineering of Graphene

2014

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Graphene is a two dimensional one atom thick allotrope of carbon that displays unusual crystal structure, electronic characteristics, charge transport behavior, optical clarity, physical & mechanical properties, thermal conductivity and much more that is yet to be discovered. Consequently, it has generated unprecedented excitement in the scientific community; and is of great interest to wide ranging industries including semiconductor, optoelectronics and printed electronics. Graphene is considered to be a next-generation conducting material with a remarkable band-gap structure, and has the potential to replace traditional electrode materials in optoelectronic devices. It has also been identified as one of the most promising materials for post-silicon electronics. For many such applications, modulation of the electrical and optical properties, together with tuning the band gap and the resulting work function of zero band gap graphene are critical in achieving the desired properties and outcome. In understanding the importance, a number of strategies including various functionalization, doping and hybridization have recently been identified and explored to successfully alter the work function of graphene. In this review we primarily highlight the different ways of surface modification, which have been used to specifically modify the band gap of graphene and its work function. This article focuses on the most recent perspectives, current trends and gives some indication of future challenges and possibilities.

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Role of Oxygen in the Work Function Modification at Various Stages of Chemically Synthesized Graphene

Cited by 24 publications

References 26 publications

Tuning the work function of graphene toward application as anode and cathode

Tuning the work function of graphene toward application as anode and cathode

Graphene oxide: the new membrane material

Work Function Engineering of Graphene

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