Preparation of platinum nanoparticles on TiO2 from DNA-protected particles

Hisahiro Einaga; Junki Kawarada; Kana Kimura; Yasutake Teraoka

doi:10.1016/j.colsurfa.2014.04.056

Preparation of platinum nanoparticles on TiO₂ from DNA-protected particles

Hisahiro Einaga, Junki Kawarada, Kana Kimura, Yasutake Teraoka

Functional Materials Science

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

This paper reports on preparation methods for TiO₂-supported Pt catalysts (Pt/TiO₂) using colloidal DNA-protected Pt particles. Pt nanoparticles with the average size of 1.4nm were prepared by reduction of H₂PtCl₆ with NaBH₄ in aqueous solution in the presence of salmon sperm deoxyribonucleic acid (DNA). The Pt particles were deposited on TiO₂ with high dispersion by mixing the TiO₂ powder with the Pt particles in the solution. The DNA polymer was completely removed from the Pt/TiO₂ surface by centrifugation and washing processes. XAFS studies revealed that the DNA-stabilized Pt particles mainly consisted of Pt oxides. The Pt dispersion on TiO₂ did not depend on the amount of DNA in colloidal Pt dispersion, whereas the Pt loading level increased with the increase in the DNA amount. The Pt/TiO₂ catalysts after oxidation-reduction treatment have both high oxidizability and reducibility, and the catalysts exhibited higher activity for CO oxidation than the PtTiO₂ catalyst prepared by impregnation technique.

Original language	English
Pages (from-to)	179-184
Number of pages	6
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	455
Issue number	1
DOIs	https://doi.org/10.1016/j.colsurfa.2014.04.056
Publication status	Published - Aug 5 2014

All Science Journal Classification (ASJC) codes

Surfaces and Interfaces
Physical and Theoretical Chemistry
Colloid and Surface Chemistry

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10.1016/j.colsurfa.2014.04.056

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title = "Preparation of platinum nanoparticles on TiO2 from DNA-protected particles",

abstract = "This paper reports on preparation methods for TiO2-supported Pt catalysts (Pt/TiO2) using colloidal DNA-protected Pt particles. Pt nanoparticles with the average size of 1.4nm were prepared by reduction of H2PtCl6 with NaBH4 in aqueous solution in the presence of salmon sperm deoxyribonucleic acid (DNA). The Pt particles were deposited on TiO2 with high dispersion by mixing the TiO2 powder with the Pt particles in the solution. The DNA polymer was completely removed from the Pt/TiO2 surface by centrifugation and washing processes. XAFS studies revealed that the DNA-stabilized Pt particles mainly consisted of Pt oxides. The Pt dispersion on TiO2 did not depend on the amount of DNA in colloidal Pt dispersion, whereas the Pt loading level increased with the increase in the DNA amount. The Pt/TiO2 catalysts after oxidation-reduction treatment have both high oxidizability and reducibility, and the catalysts exhibited higher activity for CO oxidation than the PtTiO2 catalyst prepared by impregnation technique.",

author = "Hisahiro Einaga and Junki Kawarada and Kana Kimura and Yasutake Teraoka",

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T1 - Preparation of platinum nanoparticles on TiO2 from DNA-protected particles

AU - Einaga, Hisahiro

AU - Kawarada, Junki

AU - Kimura, Kana

AU - Teraoka, Yasutake

PY - 2014/8/5

Y1 - 2014/8/5

N2 - This paper reports on preparation methods for TiO2-supported Pt catalysts (Pt/TiO2) using colloidal DNA-protected Pt particles. Pt nanoparticles with the average size of 1.4nm were prepared by reduction of H2PtCl6 with NaBH4 in aqueous solution in the presence of salmon sperm deoxyribonucleic acid (DNA). The Pt particles were deposited on TiO2 with high dispersion by mixing the TiO2 powder with the Pt particles in the solution. The DNA polymer was completely removed from the Pt/TiO2 surface by centrifugation and washing processes. XAFS studies revealed that the DNA-stabilized Pt particles mainly consisted of Pt oxides. The Pt dispersion on TiO2 did not depend on the amount of DNA in colloidal Pt dispersion, whereas the Pt loading level increased with the increase in the DNA amount. The Pt/TiO2 catalysts after oxidation-reduction treatment have both high oxidizability and reducibility, and the catalysts exhibited higher activity for CO oxidation than the PtTiO2 catalyst prepared by impregnation technique.

AB - This paper reports on preparation methods for TiO2-supported Pt catalysts (Pt/TiO2) using colloidal DNA-protected Pt particles. Pt nanoparticles with the average size of 1.4nm were prepared by reduction of H2PtCl6 with NaBH4 in aqueous solution in the presence of salmon sperm deoxyribonucleic acid (DNA). The Pt particles were deposited on TiO2 with high dispersion by mixing the TiO2 powder with the Pt particles in the solution. The DNA polymer was completely removed from the Pt/TiO2 surface by centrifugation and washing processes. XAFS studies revealed that the DNA-stabilized Pt particles mainly consisted of Pt oxides. The Pt dispersion on TiO2 did not depend on the amount of DNA in colloidal Pt dispersion, whereas the Pt loading level increased with the increase in the DNA amount. The Pt/TiO2 catalysts after oxidation-reduction treatment have both high oxidizability and reducibility, and the catalysts exhibited higher activity for CO oxidation than the PtTiO2 catalyst prepared by impregnation technique.

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Preparation of platinum nanoparticles on TiO₂ from DNA-protected particles

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