Lublow, M.; Skorupska, K.; Zoladek, S.; Kulesza, P.J.; Vo-Dinh, T.; Lewerenz, H.J.: On the behaviour of Au plasmonic nanoparticles during hydrogen evolution at p-Si. Electrochemistry Communications 12 (2010), p. 1298-1301

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 agent 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 (1x1) and SiO2. Proton reduction in 1M 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.