碳纳米管@SiO_2@Ag纳米复合材料的制备及其表面增强拉曼效应  

Synthesis of Caron Nanobutes@SiO_2@Ag Nanocomposites for Surface-Enhanced Raman Scattering

作　　者：周鑫[1] 姚爱华[1,2] 周田[1] 王德平[1,2] 

机构地区：[1]同济大学材料科学与工程学院,上海200092 [2]同济大学先进土木工程材料教育部重点实验室,上海200092

出　　处：《无机化学学报》2014年第3期543-549,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.50702037);上海市自然科学基金(13RZ1444200);同济大学中央高校基本科研业务费专项基金资助项目

摘　　要：本文以SiO2为中间层,在多壁碳纳米管(MWCNTs)表面负载Ag纳米粒子,制备出CNTs@SiO2@Ag纳米复合材料,并采用TEM、XRD、UV-Vis、XPS等对纳米复合材料的结构、形貌和成分进行了表征,同时对该纳米复合材料的表面增强拉曼散射(Surface-enhanced Raman scattering,SERS)效应进行了研究。结果显示,Ag纳米颗粒有效提高了CNTs的SERS活性,纳米复合材料的拉曼峰强度是单纯CNTs拉曼峰强的近5倍。进一步研究了吸附罗丹明6G生物染料分子的SERS光谱,结果表明R6G分子的拉曼信号的质量与强度得到显著提高。因此,所制备的CNTs@SiO2@Ag纳米复合材料有望作为SERS的活性基底,应用于生物无损检测领域。With SiO2 acting as an interlinker, multiwalled carbon nanotubes （MWCNTs） were grafted with Ag nanoparticles to form CNTs@SiO2@Ag nancomposites. The microstructure, morphology and composition of the nanocomposites were characterized by TEM, XRD, UV-Vis, XPS. Meanwhile, surface-enhanced Raman scattering （SERS） effect of the nanocomposites was also studied. The results show that Ag nanoparticles effectively improve SERS activity of CNTs, and compared with the pure CNTs, the Raman peak intensities of the nanocomposite increase by 5 times. Furthermore, the SERS activity of the nanocomposite was investigated using Rhodamine 6G （R6G） as the probe molecules. It is found that the SERS signal intensity and quality of the R6G molecules are obviously improved. The high SERS sensitivity of the nanocomposite make it a suitable substrate for noninvasive biomedical detection.

关 键 词：碳纳米管 银 二氧化硅 表面增强拉曼散射 

分 类 号：O614.24[理学—无机化学] O613.71[理学—化学]