Size effects in thermal and photochemistry of (NO)2 on Ag nanoparticles

Daniel Mulugeta, Ki Hyun Kim, Kazuo Watanabe, Dietrich Menzel, Hans Joachim Freund

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42 Scopus citations

Abstract

NO dimers adsorbed on alumina supported silver nanoparticles (Ag NPs, radii R∼1-6nm) show decreasing desorption temperatures and complex behavior of photoinduced desorption with decreasing NP size. In particular, for resonant excitation of the (1,0) Mie plasmon at 3.5 eV the photoinduced desorption cross section increases with 1/R, showing a pronounced enhancement (40 times) at R∼2.5nm compared to Ag(111). At 4.7 eV the translational temperature of photodesorbed NO increases strongly with 1/R. We discuss these trends and peculiarities in terms of the size-dependent properties of the Ag NPs.

Original languageEnglish
Article number146103
JournalPhysical Review Letters
Volume101
Issue number14
DOIs
StatePublished - 1 Oct 2008

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