The electrical properties of graphene modified by bromophenyl groups derived from a diazonium compound

被引：44

作者：

Dong, Xiaochen ^{[2
]}

Long, Qing ^{[2
]}

Wei, Ang ^{[2
]}

Zhang, Wenjing ^{[3
]}

Li, Lain-Jong ^{[3
]}

Chen, Peng ^{[1
]}

Huang, Wei ^{[2
]}

机构：

[1] Nanyang Technol Univ, Sch Chem & Biomed Engn, Singapore 637457, Singapore

[2] NUPT, IAM, KLOEID, Nanjing 210046, Jiangsu, Peoples R China

[3] Acad Sinica, Res Ctr Appl Sci, Taipei 11529, Taiwan

来源：

CARBON | 2012年 / 50卷 / 04期

基金：

新加坡国家研究基金会;

关键词：

WALLED CARBON NANOTUBES; ELECTROCHEMICAL REDUCTION; CHEMICAL-MODIFICATION; COVALENT MODIFICATION; BILAYER GRAPHENE; SINGLE-LAYER; FUNCTIONALIZATION; MULTILAYERS; REACTIVITY; SCATTERING;

D O I：

10.1016/j.carbon.2011.11.029

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Graphene field-effect transistors were fabricated with mechanically exfoliated single-layer graphene (SLG) and bilayer graphene (BLG) sheets and the functionalization effects of bromophenyl groups derived from a diazonium compound on its transfer properties were explored. Spectroscopic and electrical studies reveal that the bromophenyl grafting imposes p-doping to both SLG and BLG. The modification of SLG by bromophenyl groups significantly reduces the hole carrier mobility and the saturation current in SLG transistors, suggesting an increase in both long-range impurity and short-range defect scattering. Unexpectedly, the bromophenyl group functionalization on BLG does not obviously increase both types of scattering, indicating that the BLG is relatively more resistant to charge- or defect-induced scattering. The results indicate that chemical modification is a simple approach to tailor the electrical properties of graphene sheets with different numbers of layers. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：1517 / 1522

页数：6

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