Ag/石墨烯复合材料的制备及其对邻氨基苯甲酸甲酯的SERS效应  

Preparation of Ag / graphene nanocomposite and its SERS effect on methyl anthranilate

作　　者：董立雅[1] 嵇天浩[1] 王继梅[2] 冀志江[2] 

机构地区：[1]北京工商大学理学院,北京100048 [2]中国建筑材料科学研究总院环境功能材料研究室,北京100024

出　　处：《功能材料》2014年第4期67-71,75,共6页Journal of Functional Materials

基　　金：国家"十二五"支撑计划资助项目(2012BAJ02B08)

摘　　要：以还原的氧化石墨烯（r-GO）为前驱物，采用紫外光照还原和水合肼还原两个不同的合成过程，简单制得了没有有机分子存在的Ag沉积r-GO纳米复合材料，其中被还原的Ag呈颗粒状沉积在r-GO片层表面。由于紫外光照还原反应速率较慢，制得的Ag颗粒分散性相对较好，尺寸分布较窄，粒径主要处在25～80nm间；而用水合肼还原，因反应速率较快，获得的Ag颗粒团聚较严重，尺寸分布较宽，粒径主要处在20～130nm间。在此基础上，以一种香料邻氨基苯甲酸甲酯为标记分子，在波长为785nm激光激发下，对获得的一系列含Ag复合材料进行了表面增强Ra-man散射光谱（SERS）测试，结果表明，它们具有非常高的SERS效应，增强因子在10^8附近，其中，用水合肼还原制得的复合材料SERS效应更加明显。Ag-deposited reduced graphene oxide （r-GO） nanocomposites, without any additional organic mole- cules, were obtained simply through two different preparation processes of ultra-violet reduction and hydrazine reduction. It has been demonstrated that particle-shaped Ag was formed on the surface of r-GO. Using ultra-vi- olet reduction route, due to very slow reduction reaction, Ag particles on the r-GO surface exhibit relatively good dispersion and narrow size distribution with a diameter range of 25-80 nm. However, under hydrazine re- duction, Ag particles show severely aggregation and wide size distribution with a diameter range of 20-130 nm due to fast reduction reaction. Based on the preparations, the surface-enhanced Raman scattering （SERS） spec- troscopes of methyl anthranilate molecules on a series of Ag-deposited r-GO samples were measured in detail, and the results show that such composites have high SERS effect on the organic molecules with an enhancement factor of an order of 10^8 , in which the composite prepared from hydrazine reduction shows obviously higher.

关 键 词：纳米复合材料 石墨烯 Ag-石墨烯 香料分子 SERS效应 

分 类 号：O433[机械工程—光学工程] TB381[理学—光学]