An effective sonication-assisted reduction approach to synthesize highly dispersed Co nanoparticles on SiO2

Wallace Tse Loong Lim, Ziyi Zhong, Armando Borgna*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

A sonication-assisted method to synthesize supported Co/SiO2 nanoparticles was developed using NaBH4 as reducing agent. Co nanoparticles with an average size of 2.4 nm were obtained. Further fine-tuning of the particle size was achieved by adding stabilizer. TEM and XPS confirmed that the dispersion was significantly improved by using sonication. After calcination at 400 oC or 600 oC for 2 h, the size of the Co3O4 nanoparticles was increased to ca. 8 and 11 nm, respectively. Traces of Co2SiO4, B2O3 and Co(B4O7) were also detected after calcination at high temperatures. This method provides a new approach to the controlled synthesis of supported transition metal nanoparticles.

Original languageEnglish
Pages (from-to)122-127
Number of pages6
JournalChemical Physics Letters
Volume471
Issue number1-3
DOIs
StatePublished - 16 Mar 2009
Externally publishedYes

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