基于Au修饰的花状V2O5的表面增强拉曼散射研究  

Study on Surface Enhanced Raman Scattering of Flower-like V2O5 MaterialsModified by Au Nanoparticles

作　　者：杨松 盛双华 刘应开 YANG Song;SHENG Shuanghua;LIU Yingkai(Institute of Physics and Electronic Information,Yunnan Normal University,Kunming 650500,China;Yunnan Key Laboratory of Opto-electronic Information Technology,Kunming 650500,China)

机构地区：[1]云南师范大学物理与电子信息学院,昆明650500 [2]云南省光电信息技术重点实验室,昆明650500

出　　处：《材料导报》2020年第S01期34-38,共5页Materials Reports

基　　金：国家自然科学基金(11764046)。

摘　　要：通过一步水热法合成花状V 2O 5材料,随后利用离子束溅射法在花状V 2O 5表面沉积一层Au膜并在400℃条件下退火,获得Au纳米粒子修饰的花状V 2O 5@Au复合材料。通过XRD、XPS和TEM等手段对样品进行表征,同时对其进行表面增强拉曼散射(SERS)测试分析。结果表明:花状V 2O 5@Au复合材料作为SERS基底具有良好的拉曼活性,对罗丹明6G(R6G)的最低检测浓度可达1.0×10^-8 mol·L^-1,增强因子约为105;对浓度为10^-6 mol·L^-1的R6G测试30个不同点的SERS检测结果显示,特征峰强度的相对标准偏差(RSD)均低于20%,说明花状V 2O 5@Au复合材料对R6G的检测具有较高的灵敏度和良好的检测重现性。另外,花状V 2O 5@Au复合材料作为基底对致癌物孔雀石绿(MG)和罗丹明B(RhB)均表现出较高的检测灵敏度,其检测限(LOD)分别为4.36×10^-9 mol·L^-1和3.11×10^-8 mol·L^-1,这进一步表明该材料可应用于食品安全检测和环境监测。The flower-like V2O5 materials were synthesized via one-step hydrothermal method.After that,gold films were deposited on the surface of the flower-like V 2O 5 materials by ion beam sputtering and then annealed at 400℃to obtain the flower-like V 2O 5@Au materials.The samples were characterized by XRD,XPS and TEM,and surface-enhanced Raman effect(SERS)spectra were performed.It is found that the flower-like V 2O 5@Au materials are used as SERS substrates with good Raman activity,and their detected lowest concentration of rhodamine 6G(R6G)is 1.0×10^-8 mol·L^-1 and their enhancement factor is about 105.SERS spectra of the examined 30 points for R6G at the concentration of 10^-6 mol·L^-1 revealed that the relative standard deviation(RSD)of the characteristic peak intensity is less than 20%.The flower-like V 2O 5@Au materials have high sensitivity and good detection reproducibility for R6G detection.In addition,the flower-like V 2O 5@Au materials exhibit high sensitivity to the carcinogens malachite green(MG)and rhodamine B(RhB),and their limits of detection are 4.36×10^-9 mol·L^-1 and 3.11×10^-8 mol·L^-1 respectively.This substrate has a potential application for food safety and environmental monitoring.

关 键 词：花状V2O5@Au复合材料 表面增强拉曼散射 致癌物 

分 类 号：TB333[一般工业技术—材料科学与工程]