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Open AccessArticle

Controllable Charge Transfer in Ag-TiO2 Composite Structure for SERS Application

1
Key Laboratory of Functional Materials Physics and Chemistry, Jilin Normal University, Ministry of Education, Siping 136000, China
2
Key Laboratory of Excited State Physics, Changchun Institute of Optics Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
*
Author to whom correspondence should be addressed.
Academic Editor: Yuying Zhang
Nanomaterials 2017, 7(7), 159; https://doi.org/10.3390/nano7070159
Received: 3 May 2017 / Revised: 1 June 2017 / Accepted: 16 June 2017 / Published: 28 June 2017
(This article belongs to the Special Issue Nanomaterials for SERS Applications)
The nanocaps array of TiO2/Ag bilayer with different Ag thicknesses and co-sputtering TiO2-Ag monolayer with different TiO2 contents were fabricated on a two-dimensional colloidal array substrate for the investigation of Surface enhanced Raman scattering (SERS) properties. For the TiO2/Ag bilayer, when the Ag thickness increased, SERS intensity decreased. Meanwhile, a significant enhancement was observed when the sublayer Ag was 10 nm compared to the pure Ag monolayer, which was ascribed to the metal-semiconductor synergistic effect that electromagnetic mechanism (EM) provided by roughness surface and charge-transfer (CT) enhancement mechanism from TiO2-Ag composite components. In comparison to the TiO2/Ag bilayer, the co-sputtered TiO2-Ag monolayer decreased the aggregation of Ag particles and led to the formation of small Ag particles, which showed that TiO2 could effectively inhibit the aggregation and growth of Ag nanoparticles. View Full-Text
Keywords: SERS; TiO2-Ag nanocap array; magnetron sputtering; metal-semiconductor composite SERS; TiO2-Ag nanocap array; magnetron sputtering; metal-semiconductor composite
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MDPI and ACS Style

Wang, Y.; Yan, C.; Chen, L.; Zhang, Y.; Yang, J. Controllable Charge Transfer in Ag-TiO2 Composite Structure for SERS Application. Nanomaterials 2017, 7, 159.

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