期刊
NANOTECHNOLOGY
卷 25, 期 47, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/25/47/475705
关键词
nanocomposites; graphene; transport properties; electrical conductivity; thermal conductivity; polyaniline
资金
- UDSMM/University of Lille I (Villeneuve d'Ascq) [F-59650]
- Univ. of Science and Arts of Oklahoma-Gladys Anderson Emerson Fund
Polyanilines (PANI)/reduced graphene oxide (RGO) nanocomposites are chemically synthesized. Their structure and morphology are characterized by scanning and transmission electron microscopies, x-ray diffraction and Raman spectroscopy. In addition, the nanocomposites' electrical, thermal and thermoelectric (TE) transport characteristics are investigated as a function of RGO content. The power factor and figure of merit (ZT) of PANI/RGO hybrids are deduced from measurements of the electrical conductivity (sigma), Seebeck coefficient (alpha) and thermal conductivity (kappa). Experimental results reveal that the properties of PANI/RGO composites are inherently dependent on the volume fraction of RGO. It is observed that electrical percolation follows a 2D conduction process which takes place for samples having 0.099 vol% RGO content. Unlike electrical conductivity, the thermal conductivity of PANI/RGO increases only slightly with the RGO fraction and is successfully fitted using a modified MGEMA model which provides an interfacial (PANI/RGO nanoplatelets) resistance (R-k) of 4.9 x 10(-10) m(2)KW(-1). This low Rk value is attributed to good interactions between the planar geometry of RGO platelets and PANI aromatic rings through pi-pi stackings as evidenced by Raman spectroscopy and x-ray studies. Compared to that of pure PANI, the TE performance of PANI/RGO composites exhibits a ZT enhancement of two orders of magnitude.
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