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On the behaviour of Au plasmonic nanoparticles during hydrogen evolution at p-Si |
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| Authors: | M. Lublow K. Skorupska S. Zoladek P.J. Kulesza T. Vo-Dinh H.J. Lewerenz |
| Affiliation: | 1. Institute for Solar Fuels and Energy Storage Materials, Helmholtz Centre Berlin for Materials and Energy, Berlin, Germany;2. Institute for Solid State Physics, Technical University Berlin, Germany;3. Department of Chemistry, University of Warsaw, Warsaw, Poland;4. Fitzpatrick Institute for Photonics, Duke University, Durham, NC, USA;5. Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, USA |
| Abstract: | Brewster Angle Reflectometry (BAR) and spectral photocurrent analysis show that Au nanoparticles are in a resonant state during light-induced hydrogen evolution with unpolarized light near-normal incidence. Keggin-type phosphododecamolybdate (PMo12O403?) anions were used as reducing and stabilizing agents to form novel Au nanoparticles (Au-NPs). BAR was employed to analyze the resonant optical response after adsorption to the surface of hydrogen terminated p-Si(111):H (1 × 1) and SiO2. Proton reduction in 1 M H2SO4 occurs at asymmetric Au-NPs where also multipole field effects influence the plasmonic behaviour. In a comparative discussion, the contribution of surface plasmon polariton excitation to the observed pronounced photocurrent enhancement is outlined. |
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