...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Metal-enhanced fluorescence of gold nanoclusters adsorbed onto Ag@ SiO2 core-shell nanoparticles
【24h】

Metal-enhanced fluorescence of gold nanoclusters adsorbed onto Ag@ SiO2 core-shell nanoparticles

机译：金属增强的金纳米蛋白荧光吸附到Ag /〜SiO2核 - 壳纳米粒子上

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The static and time-resolved metal-enhanced fluorescence (MEF) of Au-25-adsorbed Ag@SiO2 core-shell nanoparticles (NPs) has been studied systematically with the variation of shell thicknesses, core sizes, and excitation wavelengths. The emission of Au-25-adsorbed Ag@SiO2 NPs is blue-shifted and highly enhanced compared with that of free Au-25 clusters. The blue shift arises from the plasmonic coupling of Au-25 clusters with Ag NPs, which decreases exponentially with the increase of separation between Au-25 clusters and Ag NPs. The photoluminescence (PL) intensity of Au-25-adsorbed Ag@SiO2 NPs is higher by a factor of 7.4 than that of free Au-25 clusters. The PL enhancement of Au-25-adsorbed Ag@SiO2 NPs is determined by two competing processes of near-field enhancement and fluorescence resonance energy transfer (FRET). The increase of the radiative decay rate constant with separation is identical to that of PL enhancement, suggesting that the MEF of Au-25-adsorbed Ag@SiO2 NPs arises from the increase of the radiative decay rate constant induced by the near-field enhancement of plasmonic Ag NPs. Au-25-adsorbed Ag@SiO2 NPs have also been found to be a highly sensitive and selective 'turn-off' sensor for Cu2+ ions.
机译：通过壳体厚度，核心尺寸和激发波长的变化系统地研究了Au-25-Adshobled Ag / 2核 - 壳纳米粒子（NPS）的静态和时间分辨金属增强荧光（MEF）。与游离AU-25簇相比，Au-25吸附的AG @ SiO2 NPS的发射是蓝移和高度增强的。蓝移由Au-25簇具有AG NP的等离子体耦合，这随着AU-25簇和AG NPS之间的分离的增加而导致呈指数。 Au-25吸附剂的光致发光（PL）强度为AG-SiO2 NPS比自由Au-25簇的倍数更高为7.4。 AU-25吸附AG @ SiO2 NP的PL增强由近场增强和荧光共振能量转移（FRET）的两个竞争过程确定。分离的辐射衰减率常数的增加与PL增强的常量相同，表明AU-25吸附的AG @ SiO2 NP的MEF是由于近场增强诱导的辐射衰减率恒定的增加而产生的Plasmonic Ag nps。 AU-25吸附的AG @ SiO2 NPS也被发现是Cu2 +离子的高度敏感和选择性的“关断”传感器。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号