Preparation of Pt nanoparticles dispersed in mesoporous silica

Yukitoshi Chiba, Hirobumi Shibata, Daichi Nagata, Takahiro Gunji, Ryuji Tamura, Tohru Kineri, Keishi Nishio

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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)Ci4 as a Pt source and 1,10-phenanthroline as a chelating agent. The obtained Pt-l,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-l,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 m 2/g). Furthermore, results of a TEM investigation showed that Pt nanoparticles were generated only in mesopores of mesoporous silica.

Original languageEnglish
Title of host publicationCatalytic Materials for Energy, Green Processes and Nanotechnology
Pages45-50
Number of pages6
Publication statusPublished - 3 Sep 2010
Event2009 MRS Fall Meeting - Boston, MA, United States
Duration: 30 Nov 20093 Dec 2009

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1217
ISSN (Print)0272-9172

Conference

Conference2009 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period30/11/093/12/09

Cite this

Chiba, Y., Shibata, H., Nagata, D., Gunji, T., Tamura, R., Kineri, T., & Nishio, K. (2010). Preparation of Pt nanoparticles dispersed in mesoporous silica. In Catalytic Materials for Energy, Green Processes and Nanotechnology (pp. 45-50). (Materials Research Society Symposium Proceedings; Vol. 1217).