Cu2O/Ag纳米复合物的表面增强拉曼光谱  

Surface Enhanced Raman Scattering on Cu_2O/Ag Composite

作　　者：王蕴馨[1] 宋薇[2] 杨竞秀[2] 徐蔚青[2] 赵冰[2] 

机构地区：[1]吉林省疾病预防控制中心,长春130062 [2]吉林大学超分子结构与材料国家重点实验室,长春130012

出　　处：《高等学校化学学报》2011年第8期1789-1793,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20873050,20921003,20973074,20903044,21073072)资助

摘　　要：采用简单的化学还原法制备了银纳米粒子包覆的氧化亚铜(Cu2O)纳米复合物.扫描电子显微照片显示Cu2O为八面体形的纳米粒子,表面光滑且结构对称.包覆的Ag部分占据Cu2O粒子表面.通过比较Cu2O/Ag纳米复合物、Ag溶胶及Cu纳米粒子表面吸附的4-巯基吡啶(4-Mpy)分子表面增强拉曼光谱(SERS)发现,利用此方法得到了Cu2O粒子表面吸附分子的拉曼光谱.银纳米粒子上吸附分子的拉曼增强可归因于电磁场增强,而吸附在Cu2O上的4-Mpy拉曼增强信号来自银纳米粒子周围的表面等离子共振波.Cu2O/Ag composite was prepared via a very simple chemical reduction method.The SEM images indicated that Ag nanoparticles were deposited on the surface of octahedral Cu2O particles which were smooth and symmetrical.The surface of bare Cu2O particles was surrounded by large quantities of Ag nanoparticles,but did not form a compact shell.4-Mpy molecules could be adsorbed not only on the surface of Ag nanoparticles,but also on the surface of Cu2O particles.The SERS enhancement on silver nanoparticles can be attributed to electromagnetic enhancement and chemical enhancement.On the other hand,Ag nanoparticles would also excite localized surface plasmon resaonace under the irradiation with suitable laser light,further enhancing the SERS signals of 4-MPy adsorbed on the near Cu2O particles.This method exhibites some information on the catalytic properties of the surface of the octahedral Cu2O particles and provides a new kind of materials for SERS applications.

关 键 词：氧化亚铜 银纳米粒子 表面增强拉曼光谱 

分 类 号：O641[理学—物理化学] O657[理学—化学]