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Preparation of Pt Nanoparticles Dispersed in Mesoporous Silica

Published online by Cambridge University Press:  31 January 2011

Yukitoshi Chiba ,
Hirobumi Shibata ,
Daichi Nagata ,
Takahiro Gunji ,
Ryuji Tamura ,
Tohru Kineri  and
Keishi Nishio
Yukitoshi Chiba
Affiliation:
[email protected]
Hirobumi Shibata
Affiliation:
[email protected], Tokyo University of Science, Materials Science and Technology, Noda-shi, Japan
Daichi Nagata
Affiliation:
[email protected], Tokyo University of Science, Materials Science and Technology, Noda-shi, Japan
Takahiro Gunji
Affiliation:
[email protected], Tokyo University of Science, Pure and Applied Chemistry, Noda-shi, Japan
Ryuji Tamura
Affiliation:
[email protected], Tokyo University of Science, Materials Science and Technology, Noda-shi, Japan
Tohru Kineri
Affiliation:
[email protected], Tokyo University of Science, Yamaguchi, Applied Chemistry, Sanyo-Onoda-shi, Japan
Keishi Nishio
Affiliation:
[email protected], Tokyo University of Science, Materials Science and Technology, Noda-shi, Japan
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Abstract

Platinum nanoparticles were dispersed in mesopores of mesoporous silica using a sol-gel process with a composite template consisting of an amphiphilic triblock copolymer (Pluronic P123 or F127) and a Pt-organic complex, which was prepared with K2Pt(II)Cl4 as a Pt source and 1,10-phenanthroline as a chelating agent. The obtained Pt-1,10-phenanthroline complex did not dissolve in any of several solvents, e.g., hexane, benzene, toluene, THF, H2O, CH3OH, and C2H5OH. However, when the Pt-1,10-phenanthroline complex was reacted with ethylenediamine it dissolved in many solvents. Platinum nanoparticles dispersed in mesoporous silica were obtained using a sol-gel process with a complex template consisting of Pt-1,10-phenanthroline-ethylenediamine, and an amphiphilic triblock copolymer (Pluronic P123 or F127). A sample dried at 353 K was bright yellow. When it was subsequently heat-treated at 823 K, it turned light gray. This change indicates that Pt nanoparticles can be obtained by heat-treatment at high temperature, because, to generate Pt nanoparticles, the organics chelated to Pt ions must be removed. Measurements from small-angle x-ray scattering show that mesoporous silica obtained using a complex template has a much more highly ordered pore structure than that obtained using only an amphiphilic triblock copolymer. It has both large pores (above 8 nm) and a large surface area (about 290 m2/g). Furthermore, results of a TEM investigation showed that Pt nanoparticles were generated only in mesopores of mesoporous silica.

Keywords

Ptsol-gelchemical synthesis
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1217: Symposium Y – Catalytic Materials for Energy, Green Processes and Nanotechnology , 2009 , 1217-Y08-24
Copyright
Copyright © Materials Research Society 2010

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