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Photocatalytic growth and plasmonic properties of Ag nanoparticles on TiO2 films

Published online by Cambridge University Press:  22 December 2014

Shuai Li ,
Qiang Tao ,
Da-Wei Li ,
Kun Liu  and
Qing-Yu Zhang
Shuai Li
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, School of Physics & Opto-electronic Technology, Dalian University of Technology, Dalian 116024, China
Qiang Tao
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, School of Physics & Opto-electronic Technology, Dalian University of Technology, Dalian 116024, China
Da-Wei Li
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, School of Physics & Opto-electronic Technology, Dalian University of Technology, Dalian 116024, China
Kun Liu
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, School of Physics & Opto-electronic Technology, Dalian University of Technology, Dalian 116024, China
Qing-Yu Zhang*
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, School of Physics & Opto-electronic Technology, Dalian University of Technology, Dalian 116024, China
*
a)Address all correspondence to this author. e-mail: qyzhang@dlut.edu.cn
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Abstract

Using nanoparticulate TiO2 films, the photocatalytic growth of Ag nanoparticles (NPs) in the AgNO3 aqueous solution has been studied in terms of reduction, nucleation, and coalescence. It was proved that Ag primary particles were formed in a growth time of <1 s after the photocatalysis started. The growth dynamics was found to be critical for isotropic and anisotropic growth of Ag NPs, depending on the AgNO3 concentration and surface properties of TiO2 films. In the AgNO3 solutions of ≤300 mg/L, the isotropic growth dominates the growth dynamic behavior, producing irregularly spherical Ag NPs. In the AgNO3 solutions of ≥400 mg/L, the increased reduction rate promotes the formation of Ag nanoplates in the product. Ostwald ripening and oriented attachment were suggested to be the mechanisms dominating the isotropic and anisotropic growth, respectively. A photocatalytic growth model of Ag NPs was proposed by taking Ag atom and Ag+ ion diffusion into consideration. The plasmonic properties of the Ag–TiO2 films were studied in terms of extinction, surface enhanced Raman scattering, and fluorescence enhancement.

Keywords

Ag nanoparticlesphotocatalytic growthSERSfluorescence
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 2 , 28 January 2015 , pp. 304 - 314
Copyright
Copyright © Materials Research Society 2015 

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