石墨烯表界面化學修飾及其功能調控，化學學報，2014, 72(3)，277-288
石墨烯表界面化學修飾及其功能調控
林源為a,b, 郭雪峰b,c
a beat365前沿交叉學科研究院 納米科學與技術研究中心 北京 100871;
b beat365納米化學研究中心 北京分子科學國家實驗室 分子動态與穩态國家重點實驗室 beat365 北京 100871;
c beat365工學院材料科學與工程系 北京 100871
Chemical Modification of Graphene and Its Applications
Lin Yuanwei a,b, Guo Xuefeng b,c
a Center for Nanoscience and Nanotechnology, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871;
b Center for NanoChemistry, Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871;
c Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871
摘要
石墨烯屬于碳納米材料家族中的一員，是一種單層的二維原子晶體，具有高硬度、高導熱性、高載流子遷移率等諸多優良特性，被認為是新一代電子學器件的重要基礎材料. 近年來我們課題組利用石墨烯的這些優良特性在其表界面化學修飾及其功能調控方面開展了一系列研究工作. 我們對石墨烯表界面進行了共價或非共價化學修飾，在一定程度上打開了石墨烯的帶隙，并發展了具有傳感功能的石墨烯器件. 我們還制備了基于石墨烯的納米電極，發展了新一代分子電子器件的普适性制備方法，實現了單分子器件的功能化. 展望未來，以石墨烯為代表的碳基納米材料将繼續在納電子器件研究領域發揮重要作用.
關鍵詞 ： 石墨烯, 化學修飾, 功能調控, 納米電極, 分子電子器件
Abstract：
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
http://sioc-journal.cn/Jwk_hxxb/CN/abstract/abstract343640.shtml
