title: Tuning the shape and thermoelectric property of PbTe nanocrystals by bismuth doping.
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.
authors.affiliation: Department of Chemistry, National University of Singapore, Singapore.
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhang
authors.forename: Ting
authors.initials: T
authors.lastname: Sun
authors.forename: Feng
authors.initials: F
authors.lastname: Cao
authors.forename: Ming
authors.initials: M
authors.lastname: Li
authors.forename: Minghui
authors.initials: M
authors.lastname: Hong
authors.forename: Jikang
authors.initials: J
authors.lastname: Yuan
authors.forename: Qingyu
authors.initials: Q
authors.lastname: Yan
authors.forename: Huey Hoon
authors.initials: HH
authors.lastname: Hng
authors.forename: Nianqiang
authors.initials: N
authors.lastname: Wu
authors.forename: Xiaogang
authors.initials: X
authors.lastname: Liu
mesh_terms: 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
chemical_list: D002208:Caproates; C040668:2-ethylhexanoic acid; D007854:Lead; D013691:Tellurium; D001729:Bismuth