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Ag synchronously deposited and doped TiO2 hybrid as ultrasensitive SERS substrate: A multi-function platform for SERS detection and photocatalytic degradation

Abstract

Ag simultaneously deposited and doped TiO2 (Ag-TiO2) hybrid nanoparticles (NPs) were prepared via a sol-hydrothermal method, as both sensitive surface enhanced Raman scattering (SERS) substrate and superior photocatalyst for the first time. Ag-TiO2 hybrid NPs exhibit an excellent SERS performance for several probe molecules and the enhancement factor is calculated to be 1.86×105. The detection limit of 4-mercaptobenzoic acid (4-MBA) probe on Ag-TiO2 substrate is 1×10-9 mol/L, which is four orders of magnitude lower than that on pure TiO2 as a consequence of the synergistic effects of TiO2 and Ag. This is the highest SERS sensitivity among the reported semiconductor substrates and even compares to the noble metal substrates, and a SERS enhancement mechanism from the synergistic contribution of semiconductor and noble metal was proposed. And importantly, Ag-TiO2 hybrid shows an excellent photocatalytic degradation activity for detection species under the irradiation of UV light at the lower concentration condition, even for hard-degraded 4-MBA molecule. This makes Ag-TiO2 hybrid promising as a dual-function platform for both high sensitive SERS detection and photocatalytic degradation of pollutant system. Moreover, it also proves that Ag-TiO2 hybrid can be severed as a promising recyclable SERS-active substrate by virtue of its photocatalytic self-cleaning property for some specific desires, for instance the comparative studies of different species on the same SERS platform besides view of economic benefit.

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Publication details

The article was received on 15 Mar 2018, accepted on 26 Apr 2018 and first published on 01 May 2018


Article type: Paper
DOI: 10.1039/C8CP01680A
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Ag synchronously deposited and doped TiO2 hybrid as ultrasensitive SERS substrate: A multi-function platform for SERS detection and photocatalytic degradation

    L. Yang, Q. Sang, J. Du, M. Yang, X. Li, Y. Shen, X. X. Han, X. Jiang and B. Zhao, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP01680A

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