功能化金银合金纳米粒子传感器在汞离子测定中的研究

项目名称： 功能化金银合金纳米粒子传感器在汞离子测定中的研究

项目编号： No.61505049

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 毕宁

作者单位： 河南理工大学

项目金额： 21万元

中文摘要： 汞是环境中最有害的有毒金属离子之一，能够破坏大脑，引起一系列慢性疾病。因此，对环境和生物样品中Hg2+进行高灵敏度和高选择性的检测有着非常重要的意义。目前，常用的检测Hg2+的方法通常需要昂贵的仪器设备，样品的制备过程繁琐，需要对样品进行分离和富集，从而需要大量的时间。而光学传感器不需要特殊的仪器，还可以对Hg2+进行视觉检测，引起人们的广泛关注。近年来，由于贵金属纳米粒子特殊的光学性质，人们对贵金属纳米粒子的研究日益增多。但研究的主要是单金属纳米粒子，对于双金属纳米粒子的研究很少。我们提出以未经修饰的金银合金纳米粒子为探针，利用金银合金纳米粒子的光学特性，通过在金银合金纳米粒子表面修饰带有巯基的化合物，改变金银合金纳米粒子的聚集状态，从而使其吸收光谱发生变化，利用吸光度比值的变化达到检测Hg2+的目的，以解决目前Hg2+检测方法单一、灵敏度差等科学问题，为环境中Hg2+测定奠定一定的理论

中文关键词： 紫外-可见吸收光谱；金银合金纳米粒子；局域表面等离子体共振；汞离子

英文摘要： Mercury is one of the major environmental pollutants which bring adverse effect on human brain and can cause long-term damage to biological systems. It is necessary to develop methods for the highly selective and highly efficient determination of Hg2+ in environmental and biomedical samples. Recently, the determination of Hg2+ is mainly carried out by instrumental methods, the complication of the sample preparation and the high cost of the equipment are disadvantages for the determination of Hg2+. The The separation and concentration of the analyte are not required. The determination of Hg2+ by optical sensor used widely for any specialized equipments were not required and vision inspection. The study of noble metal nanoparticles was increased for the special optical properties. However, the research focuses on the single metal nanoparticle rather than compound metal nanoparticles. In this work, unmodified Au-Ag nanoparticles as the probe was proposed for the optical properties. When the thiol compound was added into the Au-Ag nanoparticles solution, the aggregation state of Au-Ag nanoparticles was changed, which caused the shift of absorption spectra, the differences of ratios of absorbances at two wavelengths are directly proportional to the Hg2+ concentrations, to solve the scientific problems of the determination of Hg2+ was singly and insensitively. Furthermore, the experimental results can be applied to the determination of Hg2+ in environmental samples.

英文关键词： UV-vis absorption spectra;Au-Ag alloy nanoparticle;Localized surface plasmon resonance (LSPR);Mercury (II) ion (Hg2+)