Abstract
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.
Highlights
Surface enhanced Raman scattering (SERS) was initially observed by Fleischmann in 1974, and was further developed by Jeanmaire and Van Duyne in 1977 [1,2]
The intensity of SERS signal is greatly improved, and the enhancement factor can be as high as 1014 so that single molecule detection can be realized by SERS technology
The composite substrate of noble metals and semiconductor functional materials have attracted researchers’ interests because their combination can improve the property of SERS substrates, but can extend SERS substrates’ applications, in contrast to substrates consisting of a single component [13,14,15,16]
Summary
Surface enhanced Raman scattering (SERS) was initially observed by Fleischmann in 1974, and was further developed by Jeanmaire and Van Duyne in 1977 [1,2]. The intensity of SERS signal is greatly improved, and the enhancement factor can be as high as 1014 so that single molecule detection can be realized by SERS technology. Compared with other noble metals, Ag material is widely used in SERS substrates because of its high surface plasmon resonance in the visible region that can provide great contributions to the electromagnetic field and high SERS activity. The semiconductor material TiO2 with a wide band gap is electromagnetic field and high SERS activity. The semiconductor material TiO2 with a wide band Ngaanpomiasteruiaslsu2a0l1l7y, 7,s1e5l9ected in many important applications areas, such as catalytic [17,18,19,20]2 oafn1d1 antimicrobial [21,22,23] applications, due to its merits including low cost, high stability, and ubsiou-aclolymspelaetcibteidlitiyn.mMaonsyt iSmEpRoSrstaunbtsatrpaptleiscawtiiotnhsAargeasn,dsuTcihOa2sccoamtaplyotsiicte[1c7o–m20p]oannednatns taimreicprroebpialre[2d1b–2y3a].
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