Enhanced thermopower of graphene films with oxygen plasma treatment

Ni Xiao, Xiaochen Dong, Li Song, Dayong Liu, Yeeyan Tay, Shixin Wu, Lain Jong Li, Yang Zhao, Ting Yu, Hua Zhang, Wei Huang, Huey Hoon Hng, Pulickel M. Ajayan, Qingyu Yan

Research output: Contribution to journalArticlepeer-review

179 Scopus citations


In this work, we show that the maximum thermopower of few layers graphene (FLG) films could be greatly enhanced up to ∼700 μV/K after oxygen plasma treatment. The electrical conductivities of these plasma treated FLG films remain high, for example, ∼104 S/m, which results in power factors as high as ∼4.5 × 10-3 W K-2 m -1. In comparison, the pristine FLG films show a maximum thermopower of ∼80 μV/K with an electrical conductivity of ∼5 × 10 4 S/m. The proposed mechanism is due to generation of local disordered carbon that opens the band gap. Measured thermopowers of single-layer graphene (SLG) films and reduced graphene oxide (rGO) films were in the range of -40 to 50 and -10 to 20 μV/K, respectively. However, such oxygen plasma treatment is not suitable for SLG and rGO films. The SLG films were easily destroyed during the treatment while the electrical conductivity of rGO films is too low.

Original languageEnglish (US)
Pages (from-to)2749-2755
Number of pages7
JournalACS Nano
Issue number4
StatePublished - Apr 26 2011
Externally publishedYes


  • graphene film
  • oxygen plasma
  • thermopower

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy


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