Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 18, Issue 2, Pages 743-748Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp06116d
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Funding
- National Natural Science Foundation of China [21103226, 21273278]
- Ministry of Science and Technology of China [2012YQ22011307]
- Fundamental Research Funds for the Central Universities
- Science & Technology Commission of Shanghai Municipality [14DZ2261100]
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Exploring the reactivity of metal clusters is an important task in cluster science, while only a few previous studies involve the reactions of nano-sized ones. Here we report a kinetic measurement on reactions of Ag-n(-) (n = 6-69) with O-2 using a flow reactor running at 120 K. Their relative rates were obtained by fitting decay processes of parent ions at different O-2 flow rates. Comparing the variations of the kinetic rates and the photodetachment energies of Ag-n(-) (i.e. the binding energies of their excess electrons), we distinguished the separate effect of clusters' spins or their electron binding strength. This work firstly shows that reactions of O-2 and Ag-n(-) up to nano sizes are still dominated by the clusters' global electronic properties. This conclusion is conceptually important for understanding the reaction mechanisms on silver based nanocatalysts.
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