A comparative study of the deposition of nanoscale Au–S intermediates from aqueous solutions on CuO, TiO2, AND α-Fe2O3 surfaces

M. N. Likhatskii, A. A. Karacharov, A. S. Romanchenko, V. I. Zaikovskii, Yu L. Mikhlin

Research output: Contribution to journalArticlepeer-review

Abstract

Products of the interaction between dispersed copper(II), iron(III) (hematite), and titanium(IV) (rutile) oxides and aqueous solutions containing liquid prenucleation intermediates formed in the reaction of HAuCl4 and sodium sulfide with the initial 1:3 molar ratio of the reagents are studied by X-ray photoelectron spectroscopy, Cu L-, Fe L-, Ti L-, O K X-ray absorption near edge structure spectroscopy in combination with transmission electron microscopy. It is found that in comparison with treatment of supports with a HAuCl4 solution, the amount of deposited gold significantly increases in the presence of sulfide ions. Gold nanoparticles covered with adsorbed sulfur form on three studied oxides as a decomposition product of strongly disordered gold(I) sulfide. On copper oxide, discernibly larger gold nanoparticles (with a diameter of about 10 nm against 3-5 nm on hematite and rutile) are observed. The surface of the support is sulfidized.

Original languageEnglish
Pages (from-to)613-621
Number of pages9
JournalJournal of Structural Chemistry
Volume62
Issue number4
DOIs
Publication statusPublished - Apr 2021

Keywords

  • gold nanoparticles
  • gold on oxides
  • gold(I) sulfide
  • transmission electron microscopy
  • XANES
  • XPS

OECD FOS+WOS

  • 2.05 MATERIALS ENGINEERING
  • 1.04 CHEMICAL SCIENCES

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