期刊
NANOMATERIALS
卷 7, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/nano7070159
关键词
SERS; TiO2-Ag nanocap array; magnetron sputtering; metal-semiconductor composite
类别
资金
- National Natural Science Foundation of China [61575080, 61675090, 21676115]
- National Youth Program Foundation of China [21546013, 61405072, 51609100]
- Program for the development of Science and Technology of Jilin province [20150519024JH, 20150520015JH, 20160101287JC, 20140519003JH]
- Technology of Education Department of Jilin Province [2016-217, JJKH20170374KJ]
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.
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