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Thermal behavior of localized surface plasmon resonance of Au/TiO2 core/shell nanoparticle arrays

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7 Author(s)
Zheng, Yue Bing ; Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, Pennsylvania 16802 ; Huang, Po-Hsun ; Desai, Amit Yogesh ; Wang, Shi Jie
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The authors investigate the thermal behavior of localized surface plasmon resonance (LSPR) of Au/TiO2 core/shell nanoparticle arrays. Thermal annealing is carried out in three different routes, i.e., pre-TiO2 annealing, post-TiO2 annealing, and combinational annealing. It is found that the pre-TiO2 annealing causes a blueshift in LSPR, the combinational annealing results in a redshift, and the post-TiO2 annealing leads to an initial blueshift, followed by a redshift, and finally reverts to a blueshift. These resonance shifts correlate well with morphologic changes in Au cores and crystallization of TiO2 shells revealed by atomic force microscopy, x-ray diffraction, and x-ray photoemission spectroscopy.

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Applied Physics Letters  (Volume:90 ,  Issue: 18 )