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

Jong Gil Oh, Hansung Kim

Research output: Contribution to journalArticle

19 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

Fingerprint

Silicon Dioxide
Silica
Nanoparticles
silicon dioxide
nanoparticles
synthesis
Ammonia
ammonia
Condensation reactions
tetraethyl orthosilicate
Water content
Hydrolysis
Ethanol
moisture content
Metals
hydrolysis
ethyl alcohol
condensation
Coatings
Catalysts

All Science Journal Classification (ASJC) codes

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

Cite this

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Synthesis of core-shell nanoparticles with a Pt nanoparticle core and a silica shell. / Oh, Jong Gil; Kim, Hansung.

In: Current Applied Physics, Vol. 13, No. 1, 01.01.2013, p. 130-136.

Research output: Contribution to journalArticle

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