【作者】 王蕴馨； 金静； 张炜煜； 宋薇； 赵冰； 刘思洁；

【Author】 WANG Yun-xin;JIN Jing;ZHANG Wei-yu;SONG Wei;ZHAO Bing;LIU Si-jie;Jilin Provincial Center for Disease Control and Prevention;Key Laboratory for Supramolecular Structure and Materials of Ministry of Education,Jilin University;

【机构】 吉林省疾病预防控制中心； 吉林大学超分子结构与材料国家重点实验室；

【摘要】 采用了一种简单的化学刻蚀方法制备了纳米ZnO薄膜,并以此为基底得到了的高信噪比(S/N)的拉曼光谱。利用扫描电镜(SEM)、X射线光电子能谱(XPS)、X射线衍射(XRD)和拉曼光谱(Raman)对其结构和表面组成进行了表征。这些分析表明,刻蚀膜是由Zn核和ZnO表层组成的大型微纳米结构。比较了ZnO薄膜和Ag衬底上4-Mpy吸收的拉曼光谱。结果表明,这种ZnO薄膜是良好的SERS基底,可用于4-Mpy分子的检测。拉曼增强系数在10~4～10~5之间。我们还对Zn-ZnO-分子体系的电荷转移(CT)机理进行了研究,发现Zn-ZnO-Mpy体系具有特殊的拉曼增强机制。这种增强表明利用拉曼光谱探究分子与特定体系半导体的化学吸附和反应机理具有很好的应用前景。更多还原

【Abstract】 A high signal-to-noise ratio(S/N) Raman spectroscopy study of 4-mercaptopyridine absorbed on micro-nanostructured ZnO film,which has been fabricated by a very simple chemical etching method,was presented.The structure and surface composition were characterized by means of scanning electron microscopy(SEM),X-ray photoelectronic spectra(XPS),X-ray diffraction(XRD) and Raman spectra.These analyses revealed that the etched films were large-scale micro-nanostructurmcomposed of a Zn core and a ZnO coating.We compared the Raman signals of 4-Mpy absorbed on ZnO film and Ag substrate.The results indicated that this kind of ZnO film could present a good SERS substrate for detecting 4-Mpy molecules.The Raman enhatcement factor was on the order of 10~4～10~5.This high EF points to the very promising future of using Raman spectra for understanding chemisorption and reaction mechanisms of molecules on semiconductor materials in some practical systems.更多还原