Ag nanoparticles were photodeposited on the {101} crystal facets of the TiO2 anatase nanoplates. This was achieved with the photoreduction of AgNO3 in methanol solution in which TiO2 anatase nanoplates were suspended while UVA irradiation was performed. The manipulation of their size was achieved by controlling the UVA light irradiation period of time. Under illumination, electron and hole pairs are created which move to the surface of the nanoplates and are spatially separated. The electrons migrate to the {101} facets while the holes migrate to the {001} facets. As a result, Ag clusters are formed exclusively located on the {101} facets of the nanoplates.

TEM micrographs of the Ag-decorated TiO2 anatase nanoplates for the shortest illumination period t=1min (a) and the longest t=20min (b)

TEM micrographs of the Ag-decorated TiO2 anatase nanoplates for the shortest illumination period t=1min (a) and the longest t=20min (b).

All Ag-decorated TiO2 nanoplates exhibited enhanced photocatalytic properties, regarding NO oxidation and acetaldehyde decomposition, in comparison to the pure TiO2 nanoplates due to the lower recombination rate of the photogenerated electrons and holes.

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