Preparation of platinum nanoparticles on TiO2 from DNA-protected particles

Hisahiro Einaga, Junki Kawarada, Kana Kimura, Yasutake Teraoka

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)179-184
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume455
Issue number1
DOIs
Publication statusPublished - Aug 5 2014

Fingerprint

Platinum
platinum
DNA
deoxyribonucleic acid
Nanoparticles
nanoparticles
preparation
catalysts
Catalysts
oxidation
Centrifugation
washing
Carbon Monoxide
Catalyst supports
Washing
Impregnation
Powders
Oxides
Catalyst activity
Polymers

All Science Journal Classification (ASJC) codes

  • Colloid and Surface Chemistry

Cite this

Preparation of platinum nanoparticles on TiO2 from DNA-protected particles. / Einaga, Hisahiro; Kawarada, Junki; Kimura, Kana; Teraoka, Yasutake.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 455, No. 1, 05.08.2014, p. 179-184.

Research output: Contribution to journalArticle

@article{744eb1bb29b14da08e718b6e1d783da0,
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",
year = "2014",
month = "8",
day = "5",
doi = "10.1016/j.colsurfa.2014.04.056",
language = "English",
volume = "455",
pages = "179--184",
journal = "Colloids and Surfaces A: Physicochemical and Engineering Aspects",
issn = "0927-7757",
publisher = "Elsevier",
number = "1",

}

TY - JOUR

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.

UR - http://www.scopus.com/inward/record.url?scp=84900801061&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84900801061&partnerID=8YFLogxK

U2 - 10.1016/j.colsurfa.2014.04.056

DO - 10.1016/j.colsurfa.2014.04.056

M3 - Article

AN - SCOPUS:84900801061

VL - 455

SP - 179

EP - 184

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

SN - 0927-7757

IS - 1

ER -