Power factor enhancement for few-layered graphene films by molecular attachments

Daohao Sim, Dayong Liu, Xiaochen Dong, Ni Xiao, Sean Li, Yang Zhao, Lain-Jong Li, Qingyu Yan*, Huey Hoon Hng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

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 μV/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 ∼180 μV/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.

Original languageEnglish (US)
Pages (from-to)1780-1785
Number of pages6
JournalJournal of Physical Chemistry C
Volume115
Issue number5
DOIs
StatePublished - Feb 10 2011

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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