Enhanced thermopower of graphene films with oxygen plasma treatment.
Enhanced thermopower of graphene films with oxygen plasma treatment.
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DOI：
10.1021/nn2001849
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发表时间：
2011-03
期刊：
影响因子：
17.1
通讯作者：
Ni Xiao;Xiaochen Dong;Li Song;Dayong Liu;Y. Tay;Shixin Wu;Lain‐Jong Li;Yang Zhao;T. Yu;Hua Zhang;Wei Huang;H. Hng;P. Ajayan;Q. Yan
中科院分区：
文献类型：
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作者：
Ni Xiao;Xiaochen Dong;Li Song;Dayong Liu;Y. Tay;Shixin Wu;Lain‐Jong Li;Yang Zhao;T. Yu;Hua Zhang;Wei Huang;H. Hng;P. Ajayan;Q. Yan
在这项工作中，我们表明，少层石墨烯（FLG）薄膜的最大热电势可以大大提高到700 μV/K的氧等离子体处理后。经等离子体处理的FLG薄膜的电导率仍然很高，例如，10（4）S/m，这导致功率因数高达10 4.5 × 10（-3）W K（-2）m（-1）。相比之下，原始的FLG薄膜显示出最大热电势为1080 μV/K，电导率为105 × 10（4）S/m。所提出的机制是由于产生局部无序碳，打开带隙。单层石墨烯（SLG）膜和还原氧化石墨烯（rGO）膜的测量热电势分别在-40至50和-10至20 μV/K的范围内。然而，这种氧等离子体处理不适合于SLG和rGO膜。SLG膜在处理过程中容易被破坏，而rGO膜的电导率太低。
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, ∼10(4) 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.