CO-Induced Smoluchowski Ripening of Pt Cluster Arrays on the Graphene/Ir(111) Moire
Författare
Summary, in English
Regular Pt cluster arrays grown on the moire template formed by graphene on Ir(111) were tested for their stability with respect to CO gas exposure. Cluster stability and adsorption-Induced processes were analyzed as a function of cluster size, with In situ scanning tunneling microscopy and X-ray photoelectron spectroscopy. Small clusters containing fewer than 10 atoms were unstable upon CO adsorption. They sintered through Smoluchowski ripening-cluster diffusion and coalescence rather than the frequently reported Ostwald ripening mediated by metal-adsorbate complexes. Larger dusters remained immobile upon CO adsorption but became more three-dimensional. Careful analysis of the experimental data complemented by ab initio density functional theory calculations provides insight Into the origin of the CO-induced Pt cluster ripening and shape transformations.
Avdelning/ar
Publiceringsår
2013
Språk
Engelska
Sidor
2020-2031
Publikation/Tidskrift/Serie
ACS Nano
Volym
7
Issue
3
Dokumenttyp
Artikel i tidskrift
Förlag
The American Chemical Society (ACS)
Ämne
- Nano Technology
Nyckelord
- graphene
- cluster
- Smoluchowski ripening
- sintering
- carbon monoxide
- diffusion
- adsorption
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1936-086X