期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 279, 期 -, 页码 313-319出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.10.010
关键词
Surface-enhanced Raman scattering; TiO2 nanowire array; Au nanoparticle; Charge transfer; Recyclable detection
资金
- National Natural Science Foundation of China [61575225, 11374377, 11074312, 11404414]
- Undergraduate Research Training Program of Minzu University of China [GCCX2017110006, GCCX2017110007, URTP20170007]
We apply a facile photoreduction deposition strategy to grow Au nanoparticles (NPs) on the surfaces of TiO2 nanowire arrays (TiO2/Au NWAs) as a Raman sensitive substrate. The fabricated TiO2/Au NWAs can be used as a highly sensitive and recyclable SERS sensor for detecting the rhodamine 6 G (R6 G) molecules with a concentration as low as 10(-9) M. Moreover, when irradiated with UV light, the SERS sensor with high sensitivity can be fully reproduced due to the superior self-cleaning capability of the substrate. By a comparative study on the SERS activities of R6 G molecules over the substrates of pure TiO2 NWAs, pure Au NPs and TiO2/Au NWAs, as well as the photoresponse performance of pure TiO2 and TiO2/Au NWAs under visible light illumination, we provide an illuminating insight into enhanced mechanism of SERS activity for TiO2/Au NWAs. The photoresponse performances and SERS activities provide experimental evidence that enhanced SERS activity of TiO2/Au NWAs is ascribed to the efficient charge transfer among Au, TiO2 and R6 G. This work throws a new light on enhanced mechanism for SERS activity of semiconductor/noble-metal substrates, which are expected to find potential applications to fabricate highly sensitive SERS sensors for the detection of analytes.
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