Study on the electrical and thermal conductivity of ordered mesoporous TiO2 thin film incorporated with Pt nanoparticles

Tae Jung Ha, Yong June Choi, Sin Young Jung, Won Seon Seo, Young Soo Lim, Sangwoo Shin, Hyung Hee Cho, Hyung Ho Park

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Abstract

Ordered mesoporous TiO2 films with incorporated Pt nanoparticles were prepared using titanium tetraisopropoxide, hexachloroplatinic acid hexahydrate, and Pluronic P-123 as a titania precursor, a Pt precursor, and a structure-directing agent, respectively. Pt nanoparticles were introduced to enhance the electrical properties of the mesoporous films, which have excellent thermal insulation properties. We confirmed that the synthesized composite films with Pt nanoparticles had an ordered pore structure with anatase phase TiO 2 by both small-angle and wide-angle Xray diffraction analyses. Although the porosity of the composite film decreased from 37.6 to 29.3% when Pt nanoparticles were included, the conductivity ratio (σ=κ.) of the film increased greatly, up to approximately 1370 KVv-2, due to the greater increase in electrical conductivity than thermal conductivity. Based on our results, we conclude that by incorporating Pt nanoparticles into ordered mesoporous TiO2 film, the thermoelectric properties of the mesoporous films can be improved.

Original languageEnglish
Article number075001
JournalJapanese journal of applied physics
Volume50
Issue number7 PART 1
DOIs
Publication statusPublished - 2011 Jul 1

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All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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