Charge Transfer Tuned by the Surrounding Dielectrics in TiO<sub>2</sub>-Ag Composite Arrays

Charge Transfer Tuned by the Surrounding Dielectrics in TiO<sub>2</sub>-Ag Composite Arrays

TiO<sub>2</sub>/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 TiO<sub>2</sub>-Ag composite on each PS bead, in which the Ag nanoparticles were trapped partially...

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Main Authors: Yaxin Wang, Chao Yan, Chunxiang Li, Ziyang Lu, Changchang Ma, Yongsheng Yan, Yongjun Zhang
Format: Article
Language:English
Published: MDPI AG 2018-12-01
Series:Nanomaterials
Subjects:
TiO<sub>2</sub>-Ag composites
electronic transfer
surrounding dielectrics
Online Access:https://www.mdpi.com/2079-4991/8/12/1019
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spelling doaj-d808a3b2ddb74f309b8d652eb13b28bc2020-11-24T23:24:15ZengMDPI AGNanomaterials2079-49912018-12-01812101910.3390/nano8121019nano8121019Charge Transfer Tuned by the Surrounding Dielectrics in TiO<sub>2</sub>-Ag Composite ArraysYaxin Wang0Chao Yan1Chunxiang Li2Ziyang Lu3Changchang Ma4Yongsheng Yan5Yongjun Zhang6School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, ChinaZhonggong Education and Technology Co., Ltd., Changchun 130000, ChinaSchool of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, ChinaSchool of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, ChinaSchool of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, ChinaSchool of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, ChinaCollege of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, ChinaTiO<sub>2</sub>/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 TiO<sub>2</sub>-Ag composite on each PS bead, in which the Ag nanoparticles were trapped partially or fully in the TiO<sub>2</sub> matrix, depending on the TiO<sub>2</sub> 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 TiO<sub>2</sub> owing to the Ag-O-TiO<sub>2</sub> 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 TiO<sub>2</sub> at 30 nm. The surface-enhanced Raman scattering (SERS) peak intensity first increased and then decreased when the TiO<sub>2</sub> thickness changed. The observations of SERS, XPS, and UV-Vis absorption spectra were explained by the dependency of the charge-transfer process on TiO<sub>2</sub> thickness, which was ascribed to the changing dielectric properties in the metal/semiconductor system.https://www.mdpi.com/2079-4991/8/12/1019TiO<sub>2</sub>-Ag compositeselectronic transfersurrounding dielectrics
collection DOAJ
language English
format Article
sources DOAJ
author Yaxin Wang
Chao Yan
Chunxiang Li
Ziyang Lu
Changchang Ma
Yongsheng Yan
Yongjun Zhang
spellingShingle Yaxin Wang
Chao Yan
Chunxiang Li
Ziyang Lu
Changchang Ma
Yongsheng Yan
Yongjun Zhang
Charge Transfer Tuned by the Surrounding Dielectrics in TiO<sub>2</sub>-Ag Composite Arrays
Nanomaterials
TiO<sub>2</sub>-Ag composites
electronic transfer
surrounding dielectrics
author_facet Yaxin Wang
Chao Yan
Chunxiang Li
Ziyang Lu
Changchang Ma
Yongsheng Yan
Yongjun Zhang
author_sort Yaxin Wang
title Charge Transfer Tuned by the Surrounding Dielectrics in TiO<sub>2</sub>-Ag Composite Arrays
title_short Charge Transfer Tuned by the Surrounding Dielectrics in TiO<sub>2</sub>-Ag Composite Arrays
title_full Charge Transfer Tuned by the Surrounding Dielectrics in TiO<sub>2</sub>-Ag Composite Arrays
title_fullStr Charge Transfer Tuned by the Surrounding Dielectrics in TiO<sub>2</sub>-Ag Composite Arrays
title_full_unstemmed Charge Transfer Tuned by the Surrounding Dielectrics in TiO<sub>2</sub>-Ag Composite Arrays
title_sort charge transfer tuned by the surrounding dielectrics in tio<sub>2</sub>-ag composite arrays
publisher MDPI AG
series Nanomaterials
issn 2079-4991
publishDate 2018-12-01
description TiO<sub>2</sub>/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 TiO<sub>2</sub>-Ag composite on each PS bead, in which the Ag nanoparticles were trapped partially or fully in the TiO<sub>2</sub> matrix, depending on the TiO<sub>2</sub> 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 TiO<sub>2</sub> owing to the Ag-O-TiO<sub>2</sub> 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 TiO<sub>2</sub> at 30 nm. The surface-enhanced Raman scattering (SERS) peak intensity first increased and then decreased when the TiO<sub>2</sub> thickness changed. The observations of SERS, XPS, and UV-Vis absorption spectra were explained by the dependency of the charge-transfer process on TiO<sub>2</sub> thickness, which was ascribed to the changing dielectric properties in the metal/semiconductor system.
topic TiO<sub>2</sub>-Ag composites
electronic transfer
surrounding dielectrics
url https://www.mdpi.com/2079-4991/8/12/1019
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AT yongshengyan chargetransfertunedbythesurroundingdielectricsintiosub2subagcompositearrays
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