%0 Journal Article
%T Fluorescence Enhancement of CdTe Nanocystals Induced by Ag/TiO2 Core-shell Nanoparticles<br>银/二氧化钛核壳纳米颗粒对碲化镉纳米晶的荧光增强研究
%A XIA Zheng-rong
%A LI Rong-qing
%A <br>夏峥嵘
%A 李荣青
%J 光子学报
%D 2012
%I 
%X 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.
%K Ag/TiO2 core/shell nanoparticles
%K Spin-coated
%K Absorption spectra
%K Surface plasmon
%K Enhanced fluorescence<br>银/二氧化钛核壳纳米颗粒
%K 旋转涂覆
%K 吸收光谱
%K 表面等离子体
%K 荧光增强
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=9F6139E34DAA109F9C104697BF49FC39&aid=1D36885FD7A8294B1A88720B14F9A437&yid=99E9153A83D4CB11&vid=2001E0D53B7B80EC&iid=0B39A22176CE99FB&sid=43608FD2E15CD61B&eid=954CE65414DD94CA&journal_id=1004-4213&journal_name=光子学报&referenced_num=1&reference_num=22