Enhanced thermopower of graphene films with oxygen plasma treatment
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...
| Main Authors: | , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2012
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/93781 http://hdl.handle.net/10220/7452 |
| _version_ | 1811678169550290944 |
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| author | Ajayan, Pulickel M. Xiao, Ni Dong, Xiaochen Song, Li Liu, Dayong Tay, Yee Yan Wu, Shixin Li, Lain-Jong Zhao, Yang Yu, Ting Zhang, Hua Huang, Wei Hng, Huey Hoon Yan, Qingyu |
| author2 | School of Materials Science & Engineering |
| author_facet | School of Materials Science & Engineering Ajayan, Pulickel M. Xiao, Ni Dong, Xiaochen Song, Li Liu, Dayong Tay, Yee Yan Wu, Shixin Li, Lain-Jong Zhao, Yang Yu, Ting Zhang, Hua Huang, Wei Hng, Huey Hoon Yan, Qingyu |
| author_sort | Ajayan, Pulickel M. |
| collection | NTU |
| description | 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 x 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 x 104 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, which makes FLG films
unique for possible TE applications. |
| first_indexed | 2024-10-01T02:48:59Z |
| format | Journal Article |
| id | ntu-10356/93781 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:48:59Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | ntu-10356/937812023-07-14T15:57:49Z Enhanced thermopower of graphene films with oxygen plasma treatment Ajayan, Pulickel M. Xiao, Ni Dong, Xiaochen Song, Li Liu, Dayong Tay, Yee Yan Wu, Shixin Li, Lain-Jong Zhao, Yang Yu, Ting Zhang, Hua Huang, Wei Hng, Huey Hoon Yan, Qingyu School of Materials Science & Engineering DRNTU::Engineering::Materials::Nanostructured materials DRNTU::Engineering::Materials::Plasma treatment 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 x 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 x 104 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, which makes FLG films unique for possible TE applications. Accepted version 2012-01-06T06:54:08Z 2019-12-06T18:45:28Z 2012-01-06T06:54:08Z 2019-12-06T18:45:28Z 2011 2011 Journal Article Xiao, N., Dong, X., Song, L., Liu, D., Tay, Y. Y., Wu, S. et al. (2011). Enhanced Thermopower of Graphene Films with Oxygen Plasma Treatment. ACS Nano, 5 (4), 2749–2755. https://hdl.handle.net/10356/93781 http://hdl.handle.net/10220/7452 10.1021/nn2001849 en ACS nano © 2011 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by ACS Nano, American Chemical Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI: http://dx.doi.org/10.1021/nn2001849 ] 17 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Materials::Nanostructured materials DRNTU::Engineering::Materials::Plasma treatment Ajayan, Pulickel M. Xiao, Ni Dong, Xiaochen Song, Li Liu, Dayong Tay, Yee Yan Wu, Shixin Li, Lain-Jong Zhao, Yang Yu, Ting Zhang, Hua Huang, Wei Hng, Huey Hoon Yan, Qingyu Enhanced thermopower of graphene films with oxygen plasma treatment |
| title | Enhanced thermopower of graphene films with oxygen plasma treatment |
| title_full | Enhanced thermopower of graphene films with oxygen plasma treatment |
| title_fullStr | Enhanced thermopower of graphene films with oxygen plasma treatment |
| title_full_unstemmed | Enhanced thermopower of graphene films with oxygen plasma treatment |
| title_short | Enhanced thermopower of graphene films with oxygen plasma treatment |
| title_sort | enhanced thermopower of graphene films with oxygen plasma treatment |
| topic | DRNTU::Engineering::Materials::Nanostructured materials DRNTU::Engineering::Materials::Plasma treatment |
| url | https://hdl.handle.net/10356/93781 http://hdl.handle.net/10220/7452 |
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