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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
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
