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Title: Thermoelectric Characteristics of Solvothermally Prepared (Bi,Sb)2Te3 Mats Containing Nanosize of Sheet-Tubes
Authors: Liu, Chia-Jyi;Liu, Gao-Jhih;Tsao, Chun-Wei;Lu, Yu-Feng;Chang, Li-Shin
Contributors: 物理學系
Date: 2007-06
Issue Date: 2012-09-10T06:15:04Z
Publisher: IEEE
Abstract: We report thermoelectric characterization of Bi2-xSbxTe3
(x = 0.5, 1.0, and 1.5) synthesized by a solvothermal method
using DMF as solvent. For Bi2Te3, the size of the edge and
thickness of the hexagonal nanoplatelets are 200-250 nm and
20-25 nm, respectively. Bi2Te3 nanosheets appear to grow
epitaxially from the surface of the Te tubes, which forms in
the first step and acts as the template for the formation of the
nanostructure. Upon doping with Sb, the morphology of
Bi1.5Sb0.5Te3 changes to a cluster of nanoparticles with the
size of ~100 nm. The morphology of Bi0.5Sb1.5Te3 consists of
mainly nanoplatelets with a size of less than 100 nm and
warped nanosheets growing along the Te tube. The nominal
composition of Bi2Te3 mats containing sheet-tubes shows a
negative thermopower of ca. -94 μV/K at 280 K, whereas
Bi0.5Sb1.5Te3 shows a positive thermopower of ca. 200 μV/K
at 280 K.
Relation: The 26th International Conference on Thermoelectrics, : 30-33
Appears in Collections:[物理學系] 會議論文

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