Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
111 facet oriented Au nanoplatelets on multilayer G films on quartz (Au /ml-G, Au meaning 111 oriented Au, ml-G meaning multilayer graphene) have been prepared in a single step by pyrolysis at 900 oC of chitosan films containing HAuCl4. After pyrolysis the resulting Au /ml-G films were characterized by chemical analysis (Au content 1 mg×cm-2), Raman spectroscopy (G and D bands, IG/ID ratio of 1.13), AFM (dimensions of Au nanoplatelets 10-20 nm high, 5-25 nm wide), XRD (single diffraction peak at 38 o) and electron microscopy. Orientation of 111 facet was determined by comparison of the FESEM images with that of Kikuchi images of back scattered electron diffraction in electron microscopy. The resulting (Au /ml-G) was found to be a highly active photocatalyst for overall water splitting into H2 and O2 in the absence of sacrificial electron donors, achieving H2 production rate of 1.2 molH2 gcomposite-1 h-1. Photo response measurements show that the material exhibits catalytic activity upon irradiation to the Au plasmon band in the visible region (φ = 560 nm). This remarkable photocatalytic activity arises from the strong Au-G interaction.
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