• Acta Photonica Sinica
  • Vol. 41, Issue 2, 166 (2012)
XIA Zheng-rong* and LI Rong-qing
Author Affiliations
  • [in Chinese]
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    DOI: 10.3788/gzxb20124102.0166 Cite this Article
    XIA Zheng-rong, LI Rong-qing. Fluorescence Enhancement of CdTe Nanocystals Induced by Ag/TiO2 Core-shell Nanoparticles[J]. Acta Photonica Sinica, 2012, 41(2): 166 Copy Citation Text show less

    Abstract

    Metal-enhanced fluorescence from CdTe nanocrystals placed in close proximity to novel synthesized Ag/TiO2 core/shell nanoparticles films is studied. The Ag/TiO2 core-shell nanoparticles are synthesized in the aqueous solutions by colloid chemistry method. Transmission electron microscopy images show that mostly Ag/TiO2 core/shell nanoparticles are clearly core/shell structure and ball-shaped. The deep black cores are Ag nanoparticles and the light-colored shell are titania. In addition, the UV-Vis absorption spectra of Ag nanoparticles have a surface Plasmon absorption at 409 nm arising from the particles. A similar surface plasmon absorption due to Ag nanoparticles is observed for the titania-coated Ag nanoparticles at a wavelength longer than for the Ag nanoparticles. This absorption shift is caused by a high refractive index of the titania shell and strongly suggests a complete coverage of Ag nanoparticles with titania. The as-prepared Ag/TiO2 core-shell nanoparticles are assembled with the CdTe nanocrystals and spin-coated on the quartz glass. Significantly enhanced fluorescence emissions are observed, implying that enhanced fluorescence from Ag/TiO2 core/shell nanoparticles films is mostly due to an electric field enhancement effect. The current work is available for the applications in light emitting device, fluorescence imaging, and biological detection.
    XIA Zheng-rong, LI Rong-qing. Fluorescence Enhancement of CdTe Nanocystals Induced by Ag/TiO2 Core-shell Nanoparticles[J]. Acta Photonica Sinica, 2012, 41(2): 166
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