Size-dependent surface reactions of Ag nanoparticles supported on highly oriented pyrolytic graphite

Langmuir : the ACS Journal of Surfaces and Colloids
Hui ZhangXinhe Bao

Abstract

Various sizes of Ag particles were grown on highly oriented pyrolytic graphite (HOPG) surfaces, which had previously been modified with nanopits to act as anchoring sites. Surface reactions of O2, CHCl3, and CCl4 on the Ag particles and bulk Ag(111) surfaces were studied by X-ray photoelectron spectroscopy (XPS), and it has been shown that size dependence of O2 and CHCl3 reactions on Ag differs from that of CCl4. Weak reactions of O2 and CHCl3 were observed on the bulk Ag(111) surfaces, while strong reactions occur on Ag particles with medium Ag coverage, suggesting that the reactions are controlled by the number of surface defect sites. On the contrary, the dissociation of CCl4 is mainly determined by the exposed Ag facet area, mainly Ag(111) facet, and strong dissociation reaction happens on the bulk Ag(111) surface. The results suggest that the size effects, which are often discussed in heterogeneous catalysis, are strongly dependent on the reaction mechanism.

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Citations

Jan 17, 2016·The Journal of Chemical Physics·Sufian AlnemratJoseph P Hooper
Sep 30, 2009·International Journal of Antimicrobial Agents·Gabriela CarjaKiyoshi Okada
May 29, 2015·Physical Chemistry Chemical Physics : PCCP·Randima P GalhenageDonna A Chen
Mar 31, 2010·Advanced Materials·Dehui DengXinhe Bao
Aug 5, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Yunxi YaoXinhe Bao
Dec 23, 2019·The Journal of Chemical Physics·Amy J BrandtDonna A Chen

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