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나노입자 연구단
나노입자 연구단
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Colloidal synthesis and thermoelectric properties of La-doped SrTiO 3 nanoparticles

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Title
Colloidal synthesis and thermoelectric properties of La-doped SrTiO 3 nanoparticles
Author(s)
Kunsu Park; Jae Sung Son; Woo S.I.; Kwangsoo Shin; Oh M.-W.; Park S.-D.; Taeg Hwan Hyeon
Publication Date
2014-03
Journal
JOURNAL OF MATERIALS CHEMISTRY A, v.2, no.12, pp.4217 - 4224
Publisher
ROYAL SOC CHEMISTRYROYAL SOC CHEMISTRY
Abstract
We describe n-type nanostructured bulk thermoelectric La-doped SrTiO 3 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 SrTiO 3 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 ∼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. © 2014 The Royal Society of Chemistry.
URI
https://pr.ibs.re.kr/handle/8788114/1091
ISSN
2050-7488
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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