TY - JOUR
T1 - Titania embedded with nanostructured sodium titanate
T2 - Reduced thermal conductivity for thermoelectric application
AU - Liu, Chengyan
AU - Miao, Lei
AU - Zhou, Jianhua
AU - Tanemura, Sakae
AU - Hu, Dongli
AU - Gu, Hui
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant No. 51172234), JSPS-CAS Joint Research Project: Enhancement of thermoelectric power of nano-titanate p-type material by metallic cation intercalation.
Copyright:
Copyright 2013 Elsevier B.V., All rights reserved.
PY - 2013/7
Y1 - 2013/7
N2 - Titania embedded with layer-cracking nanostructures (sodium titanate) was synthesized by a hydrothermal method and a subsequent sintering process. The structure and morphology were determined by x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and N 2 adsorption-desorption experiments. In thermoelectric investigations, this nanocomposite has reduced thermal conductivity, where the minimum reaches about 2.4 W/m K at 700 C. This value is relatively low among the transition-metal oxides. Strong boundary scattering at the interfaces of the layered nanostructures and point defect scattering resulting from volatilization of Na+ ions seem to be main reasons for the suppression of phonon heat transfer. On the other hand, the power factor shows no apparent deterioration. Our results suggest that introduction of proper layer-cracking nanostructures into thermoelectric hosts might be effective to enhance their performance.
AB - Titania embedded with layer-cracking nanostructures (sodium titanate) was synthesized by a hydrothermal method and a subsequent sintering process. The structure and morphology were determined by x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and N 2 adsorption-desorption experiments. In thermoelectric investigations, this nanocomposite has reduced thermal conductivity, where the minimum reaches about 2.4 W/m K at 700 C. This value is relatively low among the transition-metal oxides. Strong boundary scattering at the interfaces of the layered nanostructures and point defect scattering resulting from volatilization of Na+ ions seem to be main reasons for the suppression of phonon heat transfer. On the other hand, the power factor shows no apparent deterioration. Our results suggest that introduction of proper layer-cracking nanostructures into thermoelectric hosts might be effective to enhance their performance.
KW - Thermoelectric materials
KW - boundary scattering
KW - layer-cracking nanostructures
KW - point defect scattering
KW - thermal conductivity
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U2 - 10.1007/s11664-012-2384-z
DO - 10.1007/s11664-012-2384-z
M3 - Article
AN - SCOPUS:84879798504
VL - 42
SP - 1680
EP - 1687
JO - Journal of Electronic Materials
JF - Journal of Electronic Materials
SN - 0361-5235
IS - 7
ER -