基于光子晶体带边效应的表面增强拉曼基底

发布时间：2019-04-01 12:21

【摘要】：将光子晶体的带边效应与金纳米粒子的拉曼散射增强作用相结合,制备了一种新型光子晶体表面增强拉曼散射基底(PC-Au NPs),利用罗丹明B(Rh B)作为报告分子,对所得基底性能进行检测。PC-Au NPs基底的制备包括3个步骤:在Si O2微球表面修饰氨基,再通过垂直沉降自组装得到蛋白石结构光子晶体(PC),最后,在光子晶体表面负载金纳米粒子(Au NPs)。结果表明,光子晶体的带隙范围及Au NPs的负载量直接影响了PC-Au NPs基底的检测效果;以所得的PC-Au NPs基底测定Rh B分子,其拉曼散射特征峰强度与浓度对数值呈现良好的线性关系,线性方程为I=1711lg[Rh B(mol/L)]+15244,线性相关系数R~2=0.9994,检出限为1×10~(-8)mol/L,表明此PC-Au NPs基底可用于目标物的定性及定量检测。本方法提高了传统拉曼散射光谱检测灵敏度,操作简单,具有良好的重现性,可为其它新型检测基底的制备提供。
[Abstract]:A novel photonic crystal surface-enhanced Raman scattering substrate (PC-Au NPs),) was prepared by combining the band-edge effect of photonic crystals with the Raman scattering enhancement of gold nanoparticles (Rhodamine B (Rh B) as the reporter molecule). The preparation of PC-Au NPs substrate consists of three steps: modification of amino group on the surface of Si O2 microspheres and self-assembly of opal structure photonic crystal (PC), by vertical deposition. Gold nanoparticles (Au NPs). Loaded on the Surface of Photonic crystals The results show that the band gap range of photonic crystal and the loading amount of Au NPs directly affect the detection effect of PC-Au NPs substrate. The Raman scattering characteristic peak intensity and concentration logarithm of Rh B molecule were determined on the PC-Au NPs substrate. The linear equation was I=1711lg [Rh B (mol/L] 152444, and the linear correlation coefficient was R _ (2) ~ (2) ~ (0.999 ~ (4), P < 0.01). The detection limit of 1 脳 10 ~ (- 8) mol/L, indicates that the PC-Au NPs substrate can be used for qualitative and quantitative detection of target compounds. This method improves the detection sensitivity of traditional Raman scattering spectrum, and has the advantages of simple operation and good reproducibility. It can be used for the preparation of other new detection substrates.
【作者单位】：天津大学化工学院;天津市膜科学与海水淡化重点实验室;珠海出入境检验检疫局技术中心;天津大学化学工程联合国家重点实验室;
【基金】：国家重大科学仪器开发专项(No.2012YQ090194) 国家自然科学基金(Nos.21676191,21621004)项目资助~~
【分类号】：O657.37

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