期刊
ADVANCED ELECTRONIC MATERIALS
卷 4, 期 7, 页码 -出版社
WILEY
DOI: 10.1002/aelm.201800073
关键词
covalent functionalization; edge functionalization; electrical properties; fluorine content; fluorographene
资金
- Deutsche Forschungsgemeinschaft (DFG) [SFB 953]
- European Union Seventh Framework Programme [FP7-PEOPLE-2013-IRSES, 612577]
The conductivity of few- and monolayer graphene with covalently bound moieties is a key-point in the potential application of these materials in any electrical and optoelectronic device. In particular, fluorination of such graphene-based systems is of interest, as fluorine is expected to have a strong influence on the charge-carrier density due to its high electronegativity, and therefore modify the electrical transport properties significantly. Here it is shown that, depending on the device architecture, the electrical properties of fluorinated graphene-based devices are significantly different. It is found that the conductivity of thin films of few-layer graphene decreases by several orders of magnitude with fluorine content increasing from 2.4 to 16.6 at%, whereas individual flakes show a significant increase in both conductivity and charge carrier mobility. This observation, combined with Raman microscopy study, points toward the fact that the edges of the flakes are primary sites for fluorine within the experimental range of fluorine content. The strong decrease in conductivity in the film devices is therefore associated with the high contact resistance between the fluorine saturated edges of the individual flakes.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据