一种基于碳点复合纳米材料的表面增强拉曼光谱研究

项目名称： 一种基于碳点复合纳米材料的表面增强拉曼光谱研究

项目编号： No.21473068

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 宋薇

作者单位： 吉林大学

项目金额： 90万元

中文摘要： 表面增强拉曼散射（SERS）是一种高灵敏的分子检测手段，传统SERS基底以贵金属和少量半导体纳米材料为主，对在其表面吸附性较弱的分子很难检测，因此限制了其应用。本项目拟通过将碳点与半导体或者金属复合，利用碳点/半导体(或金属)与分子之间强的电荷转移作用，增强复合基底的拉曼效应。探索碳点/半导体、碳点/金属复合纳米结构材料的尺寸、形貌、种类对其SERS性质的影响，揭示碳点/半导体、碳点/金属复合纳米结构材料的表面增强拉曼协同作用机理。利用碳点在半导体或者金属表面与探针分子的强吸附作用，实现对低拉曼散射截面分子（如多环芳烃）的高灵敏度检测。以细胞色素为探针分子，研究碳点/半导体、碳点/金属复合纳米结构材料的生物相容性与SERS性质之间的关系。利用碳点可吸收可见光并通过转换实现与其复合的半导体发生电荷分离的特性，实现碳点/半导体复合纳米材料对光催化反应进程的实时监测，扩大SERS的应用范围。

中文关键词： 表面增强拉曼光谱；碳点；复合物；半导体；金属

英文摘要： Surface enhanced Raman scattering (SERS)is a high sensitive detection method at molecular level. The traditional SERS substrate is mainly metal nanoparticles or a few kinds of semiconductors. These SERS substrates could not detect some molecules that have weak adsorption with them, limiting their widely applications. In this project, we proposed to prepare a series of carbon dots/semiconductor or carbon dots/metal nanocomposites as SERS substrate. By the electron transfer between carbon dots/semiconductors or carbon dots/metal nanoparticles and probe molecules, the SERS effect could be further enhanced. We will study the effects of the size, morphology, and types of the carbon dots/semiconductors or carbon dots/metal nanocomposites on the SERS properties, and investigate the SERS enhancement mechanism. By using the strong adsorption ability between carbon dots and some molecules, we could detect the polycyclic aromatic hydrocarbons (PAHs) with a high sensitivity. By using cytochrome molecules as probes, the relationship between the biocompatibility of the carbon dots nanocomposites and the SERS properties will be studied. In addition, we will use the good visible light adsorption ability of the carbon dots to be applicable in the photocatalytic reaction. We will study the in-situ SERS properties of the dyes on the surface of carbon dots/semiconductor nanocomposites under the irradiation of UV light, which expand the practicle applications of the SERS measurement.

英文关键词： Surface enhanced Raman Spectroscopy;Carbon Dot;Composite;Semiconductor;Metal