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Flat TiO$_2$ layers are deposited by magnetron sputtering on Ti/Si wafers.The TiO$_2$ surfaces are then sputter-coated with thin Au films of a nominalthickness of 0.5-10 nm that are converted by solid-state dewetting into Aunanoparticles of tuneable size and spacing; the Au nanoparticle size can betuned over a broad range, i.e. ca. 3-200 nm. The Au-decorated TiO$_2$ surfacesenable plasmonic photo-electrochemical water splitting under visible lightillumination (450-750 nm). The water splitting performance reaches a maximumfor TiO$_2$ layers decorated with ~ 30 nm-sized Au particles. As expected,optical absorption measurements show a red shift of the plasmonic extinctionband with increasing the Au nanoparticle size. However, the plasmonicphotocurrent is found to peak at ~ 600 nm regardless of the size of the Aunanoparticles, i.e. the plasmonic photocurrent band position issize-independent. Such a remarkable observation can be ascribed to a hotelectron injection cut-off effect.

Dewetted Au nanoparticles on TiO$_2$ surfaces -- Evidence of a size-independent plasmonic photo-electrochemical response