石墨烯表界面化学修饰及其功能调控

doi:10.6023/A13080908

摘要/Abstract

石墨烯属于碳纳米材料家族中的一员，是一种单层的二维原子晶体，具有高硬度、高导热性、高载流子迁移率等诸多优良特性，被认为是新一代电子学器件的重要基础材料. 近年来我们课题组利用石墨烯的这些优良特性在其表界面化学修饰及其功能调控方面开展了一系列研究工作. 我们对石墨烯表界面进行了共价或非共价化学修饰，在一定程度上打开了石墨烯的带隙，并发展了具有传感功能的石墨烯器件. 我们还制备了基于石墨烯的纳米电极，发展了新一代分子电子器件的普适性制备方法，实现了单分子器件的功能化. 展望未来，以石墨烯为代表的碳基纳米材料将继续在纳电子器件研究领域发挥重要作用.

关键词: 石墨烯, 化学修饰, 功能调控, 纳米电极, 分子电子器件

Graphene, a two-dimensional crystalline monolayer made of sp²-hybridized carbon atoms arranged in a honeycomb lattice, holds a set of remarkable electronic and physical properties, such as ballistic transport with low resistivity, high chemical stability, and high mechanical strength. By taking advantage of these, in recent years our research group has performed a series of studies for modifying the surfaces of graphene and tuning its properties. These studies can be mainly divided into two categories. First, we opened graphene's band gap to some extent through covalent and/or noncovalent chemical modifications, and installed sensing functions into graphene. In detail, we grafted nitrophenyl group onto graphene through an electrochemical method and methyl group onto graphene by plasma treatment to open its band gap. Also, we assembled lead sulfide or titanium dioxide onto graphene through electron beam evaporation to achieve optical or gas sensing. A rotaxane molecule with a bistable structure was also assembled onto graphene through π-π stacking to obtain optical switches with logic capability. On the other hand, we also fabricated graphene-based nanoelectrodes for making a new-generation molecular electronic devices with diverse functionalities. In detail, we cut graphene using electron beam lithography and reactive ion etching to obtain graphene electrodes. Poly(3-hexyl thiophene) or copper phthalocyanine was spin-coated onto these electrodes to achieve field effect transistors with the high carrier mobility and photoresponsive property. We further developed graphene nanoelectrodes by dash-line lithography, and molecular bridges with different functions were connected between these nanoelectrodes. These single molecule devices can switch their conductance upon exposure to external stimuli, such as metal ion, pH and light. Looking into the future, graphene, as a representative of carbon-based nanomaterials, will continue to play an important role in the area of nano/molecular electronics.

Key words: graphene, chemical modification, nanoelectrode, molecular electronic device

引用此文

林源为, 郭雪峰. 石墨烯表界面化学修饰及其功能调控[J]. 化学学报, 2014, 72(3): 277-288.

Lin Yuanwei, Guo Xuefeng. Chemical Modification of Graphene and Its Applications[J]. Acta Chimica Sinica, 2014, 72(3): 277-288.

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