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

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• 作者：Daohao Sim ; Dayong Liu ; Xiaochen Dong ; Ni Xiao ; Sean Li ; Yang Zhao ; Lain-Jong Li ; Qingyu Yan ; Huey Hoon Hng
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：February 10, 2011
• 年：2011
• 卷：115
• 期：5
• 页码：1780-1785
• 全文大小：885K
• 年卷期：v.115,no.5(February 10, 2011)
• ISSN：1932-7455

文摘

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 40 渭V/K. We further processed these FLG films by attaching them with 1,1鈥?azobis(cyanocyclohexane) or 1,3,6,8-pyrenetetrasulfonic acid. The thermopower of FLG films with attached molecules increased to above 180 渭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鈥檚 formula provided qualitative support to our experimental results.