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Open AccessArticle

Charge Transfer Tuned by the Surrounding Dielectrics in TiO2-Ag Composite Arrays

School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
Zhonggong Education and Technology Co., Ltd., Changchun 130000, China
College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Authors to whom correspondence should be addressed.
Nanomaterials 2018, 8(12), 1019;
Received: 10 November 2018 / Revised: 27 November 2018 / Accepted: 4 December 2018 / Published: 7 December 2018
TiO2/Ag bilayer films sputtered onto a 2D polystyrene (PS) bead array in a magnetron sputtering system were found to form a nanocap-shaped nanostructure composed of a TiO2-Ag composite on each PS bead, in which the Ag nanoparticles were trapped partially or fully in the TiO2 matrix, depending on the TiO2 thickness. X-ray Photoelectron Spectroscopy (XPS) results showed the opposite shifts of binding energy for Ti 2p and Ag 3d, indicating the transfer of electrons from metallic Ag to TiO2 owing to the Ag-O-TiO2 composite formation. UV-Vis absorption spectra showed the blue shifts of the surface plasma resonance peaks, and the maximum absorption peak intensity was obtained for TiO2 at 30 nm. The surface-enhanced Raman scattering (SERS) peak intensity first increased and then decreased when the TiO2 thickness changed. The observations of SERS, XPS, and UV-Vis absorption spectra were explained by the dependency of the charge-transfer process on TiO2 thickness, which was ascribed to the changing dielectric properties in the metal/semiconductor system. View Full-Text
Keywords: TiO2-Ag composites; electronic transfer; surrounding dielectrics TiO2-Ag composites; electronic transfer; surrounding dielectrics
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MDPI and ACS Style

Wang, Y.; Yan, C.; Li, C.; Lu, Z.; Ma, C.; Yan, Y.; Zhang, Y. Charge Transfer Tuned by the Surrounding Dielectrics in TiO2-Ag Composite Arrays. Nanomaterials 2018, 8, 1019.

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