Gold decoration of silica by decomposition of aqueous gold(iii) hydroxide at low temperatures

M. A. Macchione, J. E. Samaniego, R. Moiraghi, N. Passarelli, V. A. Macagno, E. A. Coronado, M. J. Yacaman, M. A. Pérez

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The decomposition of gold hydroxide to give metallic gold is known to take place around 300 °C in dry environments. However, little information about the gold hydroxide stability in wet environments has been recorded. Here, we present experimental evidence which shows that aqueous/water-enriched gold(iii) hydroxide colloids decompose spontaneously to form gold nanoparticles at temperature values above the freezing point of water. Based on this reaction, we developed a method to decorate silica spheres with gold nanoparticles by precipitation and decomposition of gold(iii) hydroxide onto the silica surface in wet media by a simple one-pot/one-step protocol. The silica-gold nanostructures are prepared in high yield and with a low level of by-products.

Original languageEnglish (US)
Pages (from-to)19979-19989
Number of pages11
JournalRSC Advances
Volume8
Issue number36
DOIs
StatePublished - 2018
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering

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