Variation of SMSI with the Au

Pd Ratio of Bimetallic Nanoparticles on TiO2(110)

Richard Gubó, Chi M. Yim, Michael Allan, Chi L. Pang, A. Berkó, Geoff Thornton

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Au/Pd nanoparticles are important in a number of catalytic processes. Here we investigate the formation of Au–Pd bimetallic nanoparticles on TiO2(110) and their susceptibility to encapsulation using scanning tunneling microscopy, as well as Auger spectroscopy and low energy electron diffraction. Sequentially depositing 5 MLE Pd and 1 MLE Au at 298 K followed by annealing to 573 K results in a bimetallic core and Pd shell, with TiOx encapsulation on annealing to ~ 800 K. Further deposition of Au on the pinwheel type TiOx layer results in a template-assisted nucleation of Au nanoclusters, while on the zigzag type TiOx layer no preferential adsorption site of Au was observed. Increasing the Au:Pd ratio to 3 MLE Pd and 2 MLE Au results in nanoparticles that are enriched in Au at their surface, which exhibit a strong resistance towards encapsulation. Hence the degree of encapsulation of the nanoparticles during sintering can be controlled by tuning the Au:Pd ratio.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalTopics in Catalysis
DOIs
Publication statusAccepted/In press - Sep 27 2017

Fingerprint

Maximum likelihood estimation
Encapsulation
Nanoparticles
Annealing
Low energy electron diffraction
Nanoclusters
Scanning tunneling microscopy
Nucleation
Sintering
Tuning
Spectroscopy
Adsorption

Keywords

  • Au–Pd alloys
  • Core–shell nanoparticles
  • Encapsulation
  • Scanning tunneling microscopy
  • SMSI

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

Cite this

Variation of SMSI with the Au : Pd Ratio of Bimetallic Nanoparticles on TiO2(110). / Gubó, Richard; Yim, Chi M.; Allan, Michael; Pang, Chi L.; Berkó, A.; Thornton, Geoff.

In: Topics in Catalysis, 27.09.2017, p. 1-10.

Research output: Contribution to journalArticle

Gubó, Richard ; Yim, Chi M. ; Allan, Michael ; Pang, Chi L. ; Berkó, A. ; Thornton, Geoff. / Variation of SMSI with the Au : Pd Ratio of Bimetallic Nanoparticles on TiO2(110). In: Topics in Catalysis. 2017 ; pp. 1-10.
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