Tuning the shape and thermoelectric property of PbTe nanocrystals by bismuth doping.
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.
Zhang
Qian
Q
Department of Chemistry, National University of Singapore, Singapore.
Sun
Ting
T
Cao
Feng
F
Li
Ming
M
Hong
Minghui
M
Yuan
Jikang
J
Yan
Qingyu
Q
Hng
Huey Hoon
HH
Wu
Nianqiang
N
Liu
Xiaogang
X
D001729:Bismuth / Q000737:chemistry*; D002208:Caproates / Q000737:chemistry; D006358:Hot Temperature; D007854:Lead / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D056951:Photoelectron Spectroscopy; D013691:Tellurium / Q000737:chemistry*; D014961:X-Ray Diffraction
D002208:Caproates; C040668:2-ethylhexanoic acid; D007854:Lead; D013691:Tellurium; D001729:Bismuth