Structure of the Au-Rh bimetallic system formed on titanate nanowires and nanotubes

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Au, Rh and Au-Rh nanoclusters were studied on one-dimensional titania nanostructures by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and infrared spectroscopy (FT-IR). On titanate nanowire and tube supports the gold 4f7/2 XP emission appeared after reduction at 83.6 eV and 85.6 eV indicating two different sizes or chemical environments of gold nanoclusters. Small clusters also developed in rhodium containing samples besides the pure metallic state. Upon CO adsorption on the 1% Rh/titanate nanostructures the IR stretching frequencies characteristic of the twin (geminal) form were dominant, whereas bimetallic nanosystems featured a pronounced linear CO stretching vibration. At the same time the highest binding energy state disappeared almost completely indicating the enlargement of nanoclusters which was in agreement with SEM results. Very likely "core-shell" bimetallic clusters form, where gold covers the rhodium.

Original languageEnglish
Pages (from-to)1114-1119
Number of pages6
JournalVacuum
Volume85
Issue number12
DOIs
Publication statusPublished - Jun 5 2011

    Fingerprint

Keywords

  • Bimetallic
  • Core-shell structure
  • Gold
  • Nanotube
  • Nanowire
  • Rhodium
  • Titania

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films

Cite this