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Plasmonic enhanced photoelectrochemical and photocatalytic performances of 1D coaxial Ag@Ag2S hybrids

Abstract

Silver (Ag) as one of the most important plasmonic metals has attracted enormous attention due to its distinct surface plasmon resonance (SPR) absorption and high electrical conductivity. Here, we use Ag nanowires (NWs) as the starting material to prepare a series of core-shell structured Ag@Ag2S composites through an in-situ controllable and spontaneous sulfidation process at room temperature. It has been found that the obtained coaxial Ag@Ag2S hybrid with optimized ratio of Ag NWs exhibits enhanced photoelectrochemical and photocatalytic performance under visible light irradiation. The underlying contribution of Ag SPR to the enhancement of photoelectrochemical and photocatalytic activities of the Ag@Ag2S hybrids has been elucidated through wavelength-dependent experiments and transient absorption spectroscopy. The results indicate that the SPR phenomenon of Ag NWs has influential effect on the photoelectrochemical and photocatalytic activity enhancement of Ag@Ag2S hybrids, which is often overlooked in the previous reports. An ultrafast electron transfer process (~350 fs) from Ag core to Ag2S shells is measured. This work provides a valuable insight into the role of Ag component in improving the photoelectrochemical and photocatalytic performance of Ag-Ag2S hybrid nanosystems, which is expected to promote comprehensive understanding and better exploitation of plasmonic Ag in universal photophysical and photochemical systems.

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Publication details

The article was accepted on 14 Sep 2017 and first published on 15 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA06473J
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Plasmonic enhanced photoelectrochemical and photocatalytic performances of 1D coaxial Ag@Ag2S hybrids

    N. Zhang, M. Li, C. F. Tan, C. K. N. Peh, T. C. Sum and G. W. W. Ho, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06473J

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