Journal
ACS NANO
Volume 7, Issue 3, Pages 2020-2031Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn400082w
Keywords
graphene; cluster; Smoluchowski ripening; sintering; carbon monoxide; diffusion; adsorption
Categories
Funding
- DFG [MI581/17-2]
- Swedish Research Council
- Danish Council for Independent Research
- U.S. DOE Office of Basic Energy Sciences, Division of Materials Science and Engineering
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
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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.
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