377391 Facile Synthetic Approach for PbTe and CuFeS2 Nanocrystals and Their Preliminary Thermoelectric Device Setup

Thursday, November 20, 2014: 9:06 AM
International 4 (Marriott Marquis Atlanta)
Daxin Liang, Materials Science and Engineering, Northeast Forestry University, Harbin, China

Recent years have witnessed increasing public concern on environmental issues caused by industrial operations[1] and unsustainable consumption of fossil fuel[2]. Thermoelectric (TE) materials are capable of converting waste heat into electricity, and are emerging as a promising alternative source of energy. When the dimensions of the material are reduced to nanometer scale, quantum confinement effects are introduced, which can alter the electronic structure[3], resulting in an improvement of thermoelectric efficiency[4].

    In this presentation, altaite phase PbTe[5] and chalcopyrite phase CuFeS2[6] were synthesized using a facile solution-phase method. The average diameters of as-synthesized PbTe and CuFeS2 nanocrystals are 13 ± 3 nm and 6.4 ± 0.5 nm, respectively. At the same time, both of them show outstanding thermoelectric properties (ZT of PbTe nanocrystals can reach 0.9, while ZT of CuFeSis 77 times the value of bulk chalcopyrite). The success of functional thermoelectric devices through a simple low-temperature solution coating of nanocrystals on glass fibers suggests the possibility of combining the high performance with other attractive properties including flexibility, lightweight and shock resistance.

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[6] D. Liang, R. Ma, S. Jiao, G. Pang and S. Feng, Nanoscale, 2012, 4, 6265-6268.

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