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Controlled oxidation level of reduced graphene oxides and its effect on thermoelectric properties

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Abstract

We investigated the thermoelectric properties of reduced graphene oxide (rGO) as a function of the oxidation level of rGO. rGO among graphene derivatives was selected as a thermoelectric material since rGO bucky paper shows low thermal conductivity due to the phonon scattering at the junctions of rGO nanoplatelets. The oxdation level of rGO was controlled by differing the amount of chemical reductant (hydrazine) used to reduce graphene oxide (GO) to rGO, which correspondingly affected the electrical conductivity and Seebeck coefficient of rGO film. In this study, the maximum of figure of merit (ZT) was found to reach to 1.1×10−4 at 298 K for rGO reduced with the hydrazine of 1000 μL. These results provide the first experimental evidence that the thermoelectric performance of graphene and its derivative can be controlled by the oxidation level of graphitic nanoplatelets.

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Authors and Affiliations

  1. Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul, 136-791, Korea

    Jaeyoo Choi, Nguyen D. K. Tu, Sang-Soo Lee & Heesuk Kim

  2. University of Science and Technology (UST), Daejeon, 305-333, Korea

    Nguyen D. K. Tu & Heesuk Kim

  3. KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, 136-701, Korea

    Sang-Soo Lee

  4. School of Advanced Materials and Engineering, Kookmin University, Seoul, 136-702, Korea

    Hyunjung Lee

  5. Electronic Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul, 136-791, Korea

    ** Sang Kim

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  1. Jaeyoo Choi
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  2. Nguyen D. K. Tu
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  4. Hyunjung Lee
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  5. ** Sang Kim
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  6. Heesuk Kim
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Correspondence to Heesuk Kim.

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Choi, J., Tu, N.D.K., Lee, SS. et al. Controlled oxidation level of reduced graphene oxides and its effect on thermoelectric properties. Macromol. Res. 22, 1104–1108 (2014). https://doi.org/10.1007/s13233-014-2160-4

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  • DOI: https://doi.org/10.1007/s13233-014-2160-4

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