Tuning the shape and thermoelectric property of PbTe nanocrystals by bismuth doping

Nanoscale
Qian ZhangXiaogang Liu

Abstract

We report the synthesis of a series of monodispersed Bi-doped PbTe nanocrystals with tunable morphologies by using a doping precursor of bismuth(III) 2-ethylhexanoate. The as-synthesized Pb(1-x)Bi(x)Te (x = 0.005, 0.010, 0.015, 0.020) nanocrystals are characterized by X-ray diffraction, X-ray photoelectron spectroscopy and Hall measurements. The nanocrystals with controlled spherical, cuboctahedral, and cubic shapes were readily prepared by varying the Bi doping concentration. Thermoelectric investigation of these nanocrystals shows that the Bi(3+) doping increases electrical conductivity from 350 to 650 K and changes the Seebeck coefficient sign from positive to negative.

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Citations

Oct 11, 2011·ACS Nano·Marcus ScheeleHorst Weller
Aug 10, 2016·ACS Applied Materials & Interfaces·Chengjun SunDong-Kyun Ko
Jul 28, 2018·Chemical Communications : Chem Comm·Zhongyong WangRobert Y Wang
Nov 1, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Tingting ChenChunlei Wang
Oct 3, 2012·Journal of the American Chemical Society·Qian ZhangZhifeng Ren

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