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Son, Jae Sung
Nanomaterials Science and Engineering Lab (NSE)
Research Interests
  • Nanoparticle, 3D printing, Thermoelectrics, Electronics

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Colloidal synthesis and thermoelectric properties of La-doped SrTiO3 nanoparticles

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Title
Colloidal synthesis and thermoelectric properties of La-doped SrTiO3 nanoparticles
Author
Park, KunsuSon, Jae SungWoo, Sung IllShin, KwangsooOh, Min-WookPark, Su-DongHyeon, Taeghwan
Keywords
FIGURE-OF-MERIT; HYDROTHERMAL SYNTHESIS; SILICON NANOWIRES; NANOCRYSTALS; PERFORMANCE; OXIDE; NANOSTRUCTURES; ENHANCEMENT; CU2CDSNSE4; EFFICIENCY
Issue Date
2014-03
Publisher
ROYAL SOC CHEMISTRYROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.2, no.12, pp.4217 - 4224
Abstract
We describe n-type nanostructured bulk thermoelectric La-doped SrTiO3 materials produced by spark plasma sintering of chemically synthesized colloidal nanocrystals. The La doping levels could be readily controlled from 3 to 9.0 at% by varying the experimental conditions. We found that nanoscale interfaces were preserved even after the sintering process, and the thermoelectric properties of the nanostructured bulk La-doped SrTiO3 were characterized. An enhanced thermoelectric efficiency was observed and attributed to the large decrease in thermal conductivity obtained with no significant change in the Seebeck coefficient or electrical conductivity. The nanostructured bulk of the La-doped SrTiO3 exhibited a maximum ZT of similar to 0.37 at 973 K at 9.0 at% La doping, which is one of the highest values reported for doped SrTiO3. Furthermore, the materials showed high thermal stability, which is important for practical high-temperature thermoelectric applications. This report demonstrates the high potential for low-cost thermoelectric energy production using highly stable and inexpensive oxide materials.
URI
https://scholarworks.unist.ac.kr/handle/201301/10167
DOI
10.1039/c3ta14699e
ISSN
2050-7488
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