高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (5): 887.doi: 10.7503/cjcu20180722

• 分析化学 • 上一篇    下一篇

双金属双硅层核-壳纳米结构Au@SiO2@Ag@SiO2用于葡萄糖检测

齐琪1, 鲁冰新1, 车玉萍1, 汪洋2, 翟锦1()   

  1. 1. 北京航空航天大学化学学院, 北京 100191
    2. 中国科学院化学研究所, 北京 100190
  • 收稿日期:2018-10-23 出版日期:2019-04-15 发布日期:2019-04-15
  • 作者简介:

    联系人简介: 翟 锦, 女, 博士, 教授, 主要从事仿生光电转换纳米材料和器件研究. E-mail: zhaijin@buaa.edu.cn

  • 基金资助:
    国家重点研究发展计划项目(批准号: 2017YFA0206902,2017YFA0206900)、 国家自然科学基金(批准号: 21471012,21771016)和国际科学和中国技术合作项目(批准号: 2014DFA52820)资助.

Bimetallic Multi-core Nanoparticles with Dual SiO2 Layer Au@SiO2@Ag@SiO2 for the Detection of Glucose

QI Qi1, LU Bingxin1, CHE Yuping1, WANG Yang2, ZHAI Jin1,*()   

  1. 1. School of Chemistry, Beihang University, Beijing 100191, China
    2. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2018-10-23 Online:2019-04-15 Published:2019-04-15
  • Contact: ZHAI Jin E-mail:zhaijin@buaa.edu.cn
  • Supported by:
    † Supported by the National Key Research and Development Program of China(Nos.2017YFA0206902, 2017YFA0206900), the National Natural Science Foundation of China(Nos.21471012,21771016) and the International Science and Technology Cooperation Program of China(No.2014DFA52820)

摘要:

制备了一种灵敏度高、 稳定性强的双金属双硅层核-壳结构纳米材料Au@SiO2@Ag@SiO2. 由于双金属之间的硅层促进了远程等离子体的激发转移, 使该纳米粒子具有良好的表面增强拉曼散射(SERS)的特性及优异的稳定性. 利用这种SERS活性材料能直接检测出人体尿液的主要成分, 且该材料呈现出对低浓度(10-6 mol/L)葡萄糖的无标记高效检出能力. 此外, 还实现了人工尿液中等浓度(10-3 mol/L)葡萄糖和尿素分子的同时检测, 以及实际尿液中10-3 mol/L葡萄糖的检测. Au@SiO2@Ag@SiO2纳米粒子具有在多种生物分子存在时快速检测葡萄糖的实际应用潜力.

关键词: Au@SiO2@Ag@SiO2, 表面增强拉曼散射, 无标记, 葡萄糖检测, 尿液

Abstract:

Surface-enhanced Raman scattering(SERS) was demonstrated as a highly efficient approach for the amplification of extremely low signals due to the strong electromagnetic field enhancement that occurs near closely-packed metallic nanostructures, which was dependent on the unique localized surface plasmon resonance(LSPR). To develop sensitive SERS probes, different geometric configurations as approaches are focusing on the synthesis of advanced nanostructures, or efficient Raman label compounds that are resonant with excitation light. These geometric factors affect the polarization direction and magnitude of plasmonic coupling and the SERS signal intensity. As we know, plasmonic properties of Au and Ag NPs are highly sensitive to their shapes. In order to improve the performance of metal nanoparticles in SERS detection, we prepared a highly sensitive and stable bimetallic double silicon core-shell nanostructured material of Au@SiO2@Ag@SiO2. The nanoparticles have good Raman scattering properties and excellent stability, since the silicon layer between the bimetals promotes remote plasma excitation transfer. The main component of human urine can be directly detected by using this SERS active material, and the material exhibits the ability to detect highly effectiveness 10-6 mol/L glucose with label-free Au@SiO2@Ag@SiO2 nanoparticles. In addition, simultaneous detection of medium concentrations of 10-3 mol/L glucose and urea molecules in artificial urine and detection of 10-3 mol/L glucose in actual urine were also achieved. The Au@SiO2@Ag@SiO2 nanoparticles show the potential for detection glucose in the presence of multiple biomolecules.

Key words: Au@SiO2@Ag@SiO2, Surface-enhanced Raman scattering, Label-free, Detection of glucose, Urine

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