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Comparative study of thermal and photo-induced reactions of NO on particulate and flat silver surfaces

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons21715

Kim,  Ki Hyun
Chemical Physics, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22222

Watanabe,  Kazuo
Chemical Physics, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21866

Menzel,  Dietrich
Chemical Physics, Fritz Haber Institute, Max Planck Society;
Physik-Department E20, Technische Universität München;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons21524

Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Kim, K. H., Watanabe, K., Menzel, D., & Freund, H.-J. (2012). Comparative study of thermal and photo-induced reactions of NO on particulate and flat silver surfaces. Surface science, 606(15-16), 1142-1151. doi:10.1016/j.susc.2012.02.005.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-231D-2
Abstract
Adsorption states, thermal reactions, and photoreactions at photon energies 2.3–4.7 eV of NO dimers and monomers have been compared between 8-nm silver nanoparticles (Ag NPs) formed on an Al₂O₃/NiAl(110) substrate and flat Ag(111) surfaces, by thermal desorption (TPD) and by photodesorption using mass selected time-of flight measurements. On the Ag NPs, the (NO)₂ and NO species are bound more weakly and with broader variation of adsorption states, compared to Ag(111). For (NO)₂ excitation of the Mie plasmon of the Ag NPs with p-polarized 3.5-eV photons enhances the photodesorption cross section (PCS) of NO from (NO)₂ by a factor 15 compared to Ag(111); even off the plasmon resonance up to 3-fold PCS enhancement is obtained which we ascribe to hot electron confinement. However, since translational energy distributions of photodesorbed NO are roughly the same on Ag NPs and on Ag(111), common mechanisms of photoexcitation and photoreactions apply on both types of surfaces, and neither enhancement modifies the photoinduced dynamics. Stronger particle-induced influences are observed for the photoinduced NO monomer by changes in its properties, chemical environments, and formation/decay kinetics. Our results show that NPs can lead to considerable changes of efficiency and, under favorable cases, also of branching of photoinduced surface reactions.