金微/纳颗粒阵列的SERS效应研究  

SERS Effect of Au Micro/Nanoparticle Arrays

作　　者：朱储红 孟国文[1,2] 王秀娟 

机构地区：[1]中科院固体物理研究所中科院材料物理重点实验室安徽省纳米材料与技术重点实验室,合肥230031 [2]中国科学技术大学,合肥230026

出　　处：《光散射学报》2016年第2期116-119,共4页The Journal of Light Scattering

基　　金：国家自然科学基金(21201168;51472245;11274312);国家重点基础研究发展规划(973计划:2013CB934304);中国科学院;国家外国专家局"创新团队国际合作伙伴计划";安徽省自然科学基金(1408085MKL53)

摘　　要：表面增强拉曼散射(surface-enhanced Raman scattering,简称为SERS)能够提供有机分子的指纹特征信息,且具有灵敏度高和响应时间快等优点,是一项具有发展前景的分析技术。纳米结构SERS基底是获得SERS信号的关键。本文利用简便的电沉积方法在硅片上制备大面积的金微/纳颗粒阵列。金纳米颗粒之间存在大量狭小的纳米间隙,在光激发下产生大量的SERS"热点",从而具有很高的SERS灵敏度。而且,这种金微/纳结构具有高结构稳定性和化学稳定性。该结构对浓度低至10-12 M的罗丹明6G(R6G)具有很高的SERS灵敏性,且具有很好的SERS信号均匀性。利用这种微/纳结构阵列SERS基底,实现对水中低浓度农药甲基对硫磷的成功检测。这表明我们制备的金微/纳颗粒阵列在检测环境中的毒性有机物污染物方面具有潜在的应用前景。Surface-enhanced Raman scattering（SERS）can provide＂fingerprint＂characteristic of molecular vibration with high sensitivity and rapid response,and thus is a promising analytical technique.The intensity of molecular Raman signal will be amplified by several orders and the so-called SERS effect occurs when molecules locate on the surface of noble metal or some semiconductor nanostructures.Therefore,nanostructured SERS substrates are essential to SERS effect.Here we report that Au micro/nanoparticle arrays are fabricated on a Si wafer by a simple electrodeposition approach.There are many nanoscale gaps between the neighboring nanoparticles,which can provide SERS＂hot spots＂upon laser excitation,therefore the arrays of Au micro/nanoparticles have high SERS sensitivity.Additionally,the Au micro/nanostructures are highly stable in both chemical and structure.The as-prepared Au micro/nanostructures showed high SERS sensitivity to ultratrace（10-12 M）rhodamine 6G（R6G）with good SERS signal uniformity.Successful detection of toxic methyl parathion with a low concentration in water was achieved by using the as-prepared Au micro/nanostructure arrays as SERS substrates.This result shows the promising application of our Au micro/nanostructure arrays in SERS monitoring of toxic organic environmental pollutants.

关 键 词：金微/纳米结构 表面增强拉曼散射 表面增强拉曼散射基底 甲基对硫磷 电沉积法 

分 类 号：O657.37[理学—分析化学]