Power Factor Enhancement for Few-Layered Graphene Films by Molecular Attachments

被引：35

作者：

Sim, Daohao ^{[1
]}

Liu, Dayong ^{[1
]}

Dong, Xiaochen ^{[2
]}

Xiao, Ni ^{[1
]}

Li, Sean ^{[3
]}

Zhao, Yang ^{[1
]}

Li, Lain-Jong ^{[4
]}

Yan, Qingyu ^{[1
]}

Hng, Huey Hoon ^{[1
]}

机构：

[1] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore

[2] Nanjing Univ Posts & Telecommun, Inst Adv Mat, Nanjing 210046, Peoples R China

[3] Univ New S Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia

[4] Natl Chiao Tung Univ, Res Ctr Appl Sci, Acad Sinica, Tin Ka Ping Photon Ctr R517, Hsinchu 300, Taiwan

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 05期

关键词：

WALLED CARBON NANOTUBES; SUSPENDED GRAPHENE; SINGLE; CONDUCTIVITY; FIELD;

D O I：

10.1021/jp1103609

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：

In this work, we prepared few-layered graphene (FLG) films and investigated their thermoelectric properties. It was found that pristine FLG films showed a low thermopower of similar to 40 mu V/K. We further processed these FLG films by attaching them with 1,1'-azobis(cyanocyclohexane) or 1,3,6,8-pyrenetetrasulfonic acid. The thermopower of FLG films with attached molecules increased to above similar to 180 mu V/K. Such enhancement in the thermopower led to an increase in their power factor by more than 4.5 times. Theoretical investigation indicated that a potential difference can be introduced between the outer layer and inner layer of FLG films upon molecule attachments. Simulation of the thermopower based on Kubo's formula provided qualitative support to our experimental results.

引用

页码：1780 / 1785

页数：6

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