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Structure transition, formation, and optical absorption property study of Ag/SiO2 nanofilm by sol–gel method

Published online by Cambridge University Press:  07 December 2012

Yan Li
Affiliation:
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Bo-Ping Zhang
Affiliation:
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Cui-Hua Zhao
Affiliation:
College of Materials Science and Engineering, Guangxi University, Nanning 530004, China
Jin-Xian Zhao
Affiliation:
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Corresponding
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Abstract

Ag nanoparticles dispersed SiO2 composite films were successfully prepared by a sol–gel method. The structural transition, formation, and optical property along with relevant band gap of Ag/SiO2 thin films during the annealing process were studied by Fourier transform infrared spectroscopy, thermogravimetry–differential thermal analysis, x-ray diffraction, and ultraviolet–visible spectroscopy, while the microstructure of thin films was revealed by transmission electron microscopy. The results indicate that the Ag spherical particles with the diameter of 10–20 nm were formed by breaking Si–O–Ag bonds above 200 °C and dispersed in the SiO2 matrix. The optical absorption property of Ag/SiO2 nanofilm in the visible range is enhanced, and the band gap (Eg) is widened with raising annealing temperatures, which is promising for the potential applications in nonlinear optical and related fields.

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Copyright © Materials Research Society 2012

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