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Structure and optical properties of Ag/CeO2 nanocomposites

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Abstract

Silver/ceria (Ag/CeO2) nanocomposites were prepared from Ce(NO3)3⋅6H2O, AgNO3, and NH4OH with different molar ratios through a hydrothermal process, and then were completed by carrying out the precursors calcining at 750 °C for 2 h under air atmosphere. Below 1 % of Ag concentration in Ag/CeO2 nanocomposites, the Ag crystalline structure does not appear. XRD and TEM results show evidence of two different effects (the agglomeration and the barrier effects) governing the process of crystal growth. HR-TEM image and EDX elemental analysis of the Ag/CeO2 nanocomposite confirmed that isolated Ag nanocrystals are dispersed in the CeO2 matrix. The red shifts are attributed to the quantum confinement effect and the valence change of the Ce+ ions. Ag nanoparticles can help to improve the absorption of visible light, enhancing the absorption intensity of Ag/CeO2 nanocomposite. These results are of great significance for the control of microstructure, crystallinity, and applications for the development of nanocomposite materials.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, National Cheng Kung University, Tainan, 701, Taiwan

    I-Tsan Liu, Min-Hsiung Hon & Chi-Yun Kuan

  2. Department of Mechanical Engineering, National Pingtung University of Science and Technology, Neipu, Pingtung, 912, Taiwan

    Lay-Gaik Teoh

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  1. I-Tsan Liu
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  2. Min-Hsiung Hon
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Correspondence to Lay-Gaik Teoh.

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Liu, IT., Hon, MH., Kuan, CY. et al. Structure and optical properties of Ag/CeO2 nanocomposites. Appl. Phys. A 111, 1181–1186 (2013). https://doi.org/10.1007/s00339-012-7339-y

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  • DOI: https://doi.org/10.1007/s00339-012-7339-y

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