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Issue 8, 2018
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Thermoelectric properties of Ag-doped CuS nanocomposites synthesized by a facile polyol method

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Abstract

We report the first thermoelectric properties of Cu1−xAgxS, x = 0–0.75 nanocomposites, synthesized by using a facile polyol method. Systematic characterizations using powder XRD, Rietveld refinement of XRD, EDAX, XPS and Raman spectroscopy confirmed their single phase, hexagonal crystal structure with the space group P63/mmc, nominal elemental composition, valence states of the constituent elements and stoichiometric nature. The TEM images showing the CuS formation of nearly perfect hexagonal disk-like particles of average thickness 26.7 nm and breadth ranging in a few hundreds of nanometers with nanorods stacked from these hexagonal nanodisks (NDs) elongated along the c axis corroborate the FESEM images. Attributed to structural phase transition, an anomaly at 55 K is clearly observed in both the thermopower and Hall resistivity data. By increasing x, a systematic reduction in thermal conductivity was observed near 300 K. Consequently, a 50% enhancement in figure of merit was observed for Cu0.9Ag0.1S as compared to pure CuS at 300 K. These results therefore are expected to provide a new direction in improving ZT near 300 K.

Graphical abstract: Thermoelectric properties of Ag-doped CuS nanocomposites synthesized by a facile polyol method

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Publication details

The article was received on 28 Nov 2017, accepted on 24 Jan 2018 and first published on 25 Jan 2018


Article type: Paper
DOI: 10.1039/C7CP07986A
Citation: Phys. Chem. Chem. Phys., 2018,20, 5926-5935
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    Thermoelectric properties of Ag-doped CuS nanocomposites synthesized by a facile polyol method

    Tarachand, S. Hussain, N. P. Lalla, Y.-K. Kuo, A. Lakhani, V. G. Sathe, U. Deshpande and G. S. Okram, Phys. Chem. Chem. Phys., 2018, 20, 5926
    DOI: 10.1039/C7CP07986A

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