摘要
采用一种简单、低成本的方法制备了单分散不同壳层厚度的Au@SiO2核壳纳米粒子。以结晶紫为探针分子,研究了核壳纳米粒子的壳层隔离纳米粒子增强拉曼光谱(SHINERS)效应与二氧化硅壳层厚度之间的关系。结果表明:随着壳层厚度从30nm减小到4nm,粒子之间局域电磁场作用逐渐增加,探针分子的拉曼信号强度大幅度增强。用增强效果最佳的4nm SiO 2壳层厚度的核壳纳米粒子可检测到浓度低达10-5mo l/L溶液中的西维因,希望结合便携拉曼仪实现农产品中残留农药西维因的现场检测。
Au @SiO2 core-shell nanoparticles with different shell thickness were prepared uniformly by an easy and low-cost method. The relationship between Shell-Isolated Nanoparticles- Enhanced Raman Spectroscopy （SHINERS） and shell thickness of the core-shell nanoparticles was studied using crystal violet （CV） as probe molecules. It is. found that the SHINERS signal intensity of CV increased dramatically with the decreasing of the shell thickness. Core-shell nanoparticles with shell thickness of 4 nm were used for the detection of carbaryl at concentrations of 10-Smol/L. It is expected that this SHINERS substrate is applicable for in situ detection of carbaryl residue in most farm produces by using the portable Raman spectrometer.
出处
《光谱实验室》
CAS
2013年第5期2512-2516,共5页
Chinese Journal of Spectroscopy Laboratory
基金
国家自然科学基金(No.20873153)
