Synthesis of core-shell nanoparticles with a Pt nanoparticle core and a silica shell

Jong Gil Oh, Hansung Kim

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

A method to prepare a core-shell structure consisting of a Pt metal core coated with a silica shell (Pt(in)SiO 2) is described herein. A silica shell was grown on poly(vinylpyrrolidone) (PVP)-stabilized Pt nanoparticles 2-3 nm in size through hydrolysis and condensation reactions of tetraethyl orthosilicate (TEOS) in a water/ethanol mixture with ammonia as a catalyst. This process requires precise control of the reaction conditions to avoid the formation of silica particles containing multiple Pt cores and core-free silica. The length of PVP molecules, water content, concentration of ammonia and Pt nanoparticles in solution were found to significantly influence the core-shell structure. By optimizing these parameters, it was possible to prepare core-shell particles each containing a single Pt nanoparticle with a silica layer coating approximately 10 nm thick.

Original languageEnglish
Pages (from-to)130-136
Number of pages7
JournalCurrent Applied Physics
Volume13
Issue number1
DOIs
Publication statusPublished - 2013 Jan 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)

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