caa a22 4500 445866241 CHVBK 20180317145458.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1140/epjd/e2011-10529-2 doi (NATIONALLICENCE)springer-10.1140/epjd/e2011-10529-2 Kinetics of the plasmon optical response of Au nanoparticles/TiO2 catalyst under O2 and H2 followed by differential diffuse reflectance spectroscopy [Elektronische Daten] [Y. Borensztein, L. Delannoy, R. Barrera, C. Louis] The changes in the optical properties of Au/TiO2 powder catalyst, prepared by the deposition-precipitation method, are measured in the visible range by use of a home-made diffuse differential reflectance spectrometer, when the ambient atmosphere is switched between H2 and O2. Two main features are observed: (i) a short wavelength one, located between400 and 600nm, is shown to be related to the modifications of the plasmon resonance of the 3-dimensional metallic gold particles with mean size around 4nm, induced by the exposure to oxygen or by its removal; (ii) a second feature, observed at long wavelengths between600 and 1100nm, is extremely sensitive to the exposure to oxygen. This optical feature could be due to the presence in the catalyst, either of Au0 clusters of several tens atoms, which are expected to display molecular-like transitions in this optical range, or to specific sites of the Au particles (edge atoms or peripheral atoms at the interface with the TiO2 support), which could be highly reactive to oxygen. EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg, 2011 Borensztein Y. Institut des NanoSciences de Paris, CNRS and UPMC Univ. Paris 6, UMR 7588, 4 place Jussieu, case courrier 840, 75252, Paris Cedex 05, France aut Delannoy L. Laboratoire de Réactivité des Surfaces, CNRS and UPMC Univ. Paris 6, UMR 7197, 4 place Jussieu, 75252, Paris Cedex 05, France aut Barrera R. Instituto de Fisica, Universidad Nacional Autonoma de Mexico, Mexico D.F., Mexico aut Louis C. Instituto de Fisica, Universidad Nacional Autonoma de Mexico, Mexico D.F., Mexico aut The European Physical Journal D Springer-Verlag 63/2(2011-07-01), 235-240 1434-6060 63:2<235 2011 63 10053 https://doi.org/10.1140/epjd/e2011-10529-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1140/epjd/e2011-10529-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Borensztein Y. Institut des NanoSciences de Paris, CNRS and UPMC Univ. Paris 6, UMR 7588, 4 place Jussieu, case courrier 840, 75252, Paris Cedex 05, France aut NATIONALLICENCE 700 1- Delannoy L. Laboratoire de Réactivité des Surfaces, CNRS and UPMC Univ. Paris 6, UMR 7197, 4 place Jussieu, 75252, Paris Cedex 05, France aut NATIONALLICENCE 700 1- Barrera R. Instituto de Fisica, Universidad Nacional Autonoma de Mexico, Mexico D.F., Mexico aut NATIONALLICENCE 700 1- Louis C. Instituto de Fisica, Universidad Nacional Autonoma de Mexico, Mexico D.F., Mexico aut NATIONALLICENCE 773 0- The European Physical Journal D Springer-Verlag 63/2(2011-07-01), 235-240 1434-6060 63:2<235 2011 63 10053 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer