SnO_2纳米粒子作为SERS基底的研究  

Surface-enhanced Raman Scattering of Molecules Adsorbed on SnO_2 Nanoparticles

作　　者：侯近龙[1,2] 贾祥非[2] 薛向欣[1] 陈雷[1] 宋微[1] 徐蔚青[1] 赵冰[1] 

机构地区：[1]吉林大学超分子结构与材料国家重点实验室,长春130012 [2]齐齐哈尔大学化学与化学工程学院,齐齐哈尔161006

出　　处：《高等学校化学学报》2012年第1期139-143,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20903044;20873050;20921003;20973074)资助

摘　　要：采用溶胶-水热法制备了不同尺寸的SnO2纳米粒子,并将其作为表面增强拉曼散射(Surface-enhanced Raman scattering,SERS)活性基底,重点探讨了表面缺陷能级与SERS性能的关系.观察到4-巯基苯甲酸(4-MBA)吸附在150℃水热合成的SnO2纳米粒子上的SERS信号最强,随着在空气中煅烧温度的升高,SERS信号逐渐减弱.分别用透射电子显微镜、紫外-可见光谱、荧光光谱、X射线衍射和X射线光电子能谱对SnO2纳米粒子进行了表征.结果表明,SnO2纳米粒子的表面氧空位和缺陷等表面性质在增强拉曼散射性能中发挥着重要的作用,表面氧空位和缺陷等含量越高其SERS信号就越强.Pure SnO2 nanoparticles were prepared by the sol-hydrothermal method and were employed as surface-enhanced Raman scattering（SERS） active substrates.The relationships between defect levels and SERS effect of SnO2 nanoparticles were mainly investigated.The strongest SERS signals were observed when the 4-mercaptobenzoic acid molecules were adsorbed on the surface of SnO2 nanoparticles（hydrothermal pro-duct）,with the increase of calcining temperature,the SERS signals became weaker.Transmission electron microscopy,UV-Vis diffuse reflectance spectroscopy,photoluminescence X-ray diffraction and X-ray photoelectron spectroscopy have been employed to investigate the SnO2 nanoparticles.The results indicated that surface properties of SnO2,such as surface defects and oxygen vacancies,etc,play important roles in the SERS.The higher is the content of surface defects and oxygen vacancies,the stronger is SERS signals.

关 键 词：表面增强拉曼散射 SNO2 电荷转移 4-巯基苯甲酸 

分 类 号：O641.3[理学—物理化学]