Synthesis of high-performance graphene nanosheets by thermal reduction of graphene oxide
以氧化石墨烯热还原法制备高性能石墨烯
A B S T R A C T
摘要
High-performance graphene nanosheets have been synthesized by thermal reduction of graphene oxide (GO) under ethanol atmosphere. The reduced GO nanosheets were characterized by X-ray photoelectron spectroscopy, Raman spectroscopy and electrical transport measurements, respectively. The results indicated that the thermal reduction of GO under ethanol atmosphere can effectively remove the oxygen-containing functional groups and restore its graphic structure compared to the ones obtained using hydrazine or hydrogen. The electrical measurements indicated that the electrical mobility of single-layer graphene sheet reduced under ethanol atmosphere at 900 8C can reach 29.08 cm2 V 1 S 1.
高性能石墨烯纳米片已经由氧化石墨烯在乙醇的气氛下热还原制成。分别用X射线光电子能谱表征减少的纳米片、拉曼光谱和电输运测量技术。结果表明，相比使用肼或氢得到的那些，乙醇气氛下的热还原可以有效去除氧气 泰宁官能团和恢复其图形结构。电气测量表明，单层电迁移率 R的石墨烯片下大气减少乙醇在900度可以达到29.08 cm2 V 1 S 1。
Keyword:Electrical properties
关键词：电气性能
1. Introduction
1.简介
Graphene, as the two-dimensional monolayer form of sp2-bonded carbon atoms [1], has attracted significant attention because of its unique electrical and physical properties and high potential applications in electrics, sensors, transparent electrodes [2–6]. To realize the fabrication of single or few layer graphene films, several methods have been explored. Mechanical exfoliation of graphite is an easy approach to obtain pure graphene sheets and it leads to the discovery of isolated single layer graphene films on bulk substrate [1]. However, the productivity of mechanical exfoliation of graphite is too low for large-scale applications. Chemical vapor deposition on different substrates is another alternative approach for the growth of single or few layer graphene [7–9]. Although, this method can obtain high quality and ultra-large graphene films, it is difficult to realize the synthesis of graphene films for any large-scale utilization in industry. Chemical reduction of exfoliated graphite oxide (GO), a chemical synthesis approach using nature graphite as initial materials, is one of the candidate for bulk production of graphene films at low cost [10]. However, the electrical properties of the GO nanosheets reduced by traditional chemical and thermal reduction methods are not high enough, and cannot meet the real applications of nano-electrics. To obtain high performance reduced GO (rGO) nanosheets, many different kinds of reduction approaches have been reported [11–14]. However, there are still significant challenges to prepare high-performance graphene sheets by reduction of GO.
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