標題: | Power Factor Enhancement for Few-Layered Graphene Films by Molecular Attachments |
作者: | Sim, Daohao Liu, Dayong Dong, Xiaochen Xiao, Ni Li, Sean Zhao, Yang Li, Lain-Jong Yan, Qingyu Hng, Huey Hoon 田家炳光電中心 Tin Ka Ping Photonics Center |
公開日期: | 10-二月-2011 |
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. |
URI: | http://dx.doi.org/10.1021/jp1103609 http://hdl.handle.net/11536/9308 |
ISSN: | 1932-7447 |
DOI: | 10.1021/jp1103609 |
期刊: | JOURNAL OF PHYSICAL CHEMISTRY C |
Volume: | 115 |
Issue: | 5 |
起始頁: | 1780 |
結束頁: | 1785 |
顯示於類別: | 期刊論文 |