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

doi:10.1021/nn2001849

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

科研成果: 期刊稿件 › 文章 › 同行评审

185 引用（Scopus）

摘要

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.

源语言	英语
页（从-至）	2749-2755
页数	7
期刊	ACS Nano
卷	5
期	4
DOI	https://doi.org/10.1021/nn2001849
出版状态	已出版 - 26 4月 2011
已对外发布	是

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title = "Enhanced thermopower of graphene films with oxygen plasma treatment",

abstract = "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.",

keywords = "graphene film, oxygen plasma, thermopower",

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

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AU - Xiao, Ni

AU - Dong, Xiaochen

AU - Song, Li

AU - Liu, Dayong

AU - Tay, Yeeyan

AU - Wu, Shixin

AU - Li, Lain Jong

AU - Zhao, Yang

AU - Yu, Ting

AU - Zhang, Hua

AU - Huang, Wei

AU - Hng, Huey Hoon

AU - Ajayan, Pulickel M.

AU - Yan, Qingyu

PY - 2011/4/26

Y1 - 2011/4/26

N2 - 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.

AB - 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.

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Enhanced thermopower of graphene films with oxygen plasma treatment

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