Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 242, Issue -, Pages 932-939Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.09.162
Keywords
TiO2 nanosheet; SERS; {001} Facets; charge-transfer
Funding
- National Natural Science Foundation of China [51472003, 51272001, 51576208, 91326101, 51572002]
- National Key Basic Research Program [2013CB632705]
- National Magnetic Confinement Fusion Science Program of China [2013GB113004, 2015GB15007, 2015GB120006]
- Doctor Scientific Research Fund
- Cooperative Innovation Research Center for Weak Signal-Detecting Materials and Devices Integration of Anhui University
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In this paper, single-crystalline TiO2 nanosheet (TNS) arrays with dominant {001} facets decorated with Ag nanoparticles were synthesized on fluorine-doped tin oxide (FFO) substrate by a simple hydrothermal method and a magnetron sputtering method. Using Rhodamine 6G (R6G) as the probe molecule, we investigated the sensitivity, reversibility and uniformity of surface-enhanced Raman scattering (SERS) substrates. It is noted that the TNS with 10s Ag-sputtering achieves the highest Raman signals, and the intensity of the SERS spectra on TNS/Ag has a significant enhancement compared with Ag film. The excellent SERS performance is attributed to synergistic effect of electromagnetic mechanism (EM) and charge-transfer (CT) enhancement mechanism. Furthermore, the band bending of the adjacent region between {001} and {101} facets, provides an additional CT from Ag to TNS, which would result in strong enhancement of the SERS signal. (C) 2016 Elsevier B.V. All rights reserved.
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