摘要
采用柠檬酸三钠还原硝酸银方法制备出银纳米粒子,并通过在玻璃表面修饰3-氨基丙基-三乙氧基硅烷(APTES)对银纳米粒子进行自组装。利用紫外-可见(UV-Vis)吸收光谱和扫描电子显微镜(SEM)测试手段对样品进行分析和表征。由测试结果可知银纳米粒子的尺寸比较均匀,组装致密度较高,基本以亚单层的形式分布于基底表面。进一步研究了以结晶紫(CV)为探针分子的自组装基底的表面增强拉曼光谱(SERS),计算发现该基底的拉曼增强因子数量级达106。结果表明:银纳米粒子自组装基底具有良好的SERS增强效应,为痕量CV的检测提供了有效的方法。
High density and uniform surface enhanced Raman spectroscopy（SERS） substrates are obtained using self-assembly Ag nanopartices on the surface of transparent glass modified with 3-aminopropyltrimethoxysilane（APTES）,where the Ag nanoparticles were synthesized by aqueous reduction of AgNO3 with trisodium citrate.Surface morphology of thin films with assembled silver nanoparticles is studied with UV-Vis spectroscopy and SEM.Using crystal violet（CV） as probe molecule,Raman spectra of CV on self-assembled Ag nanopartices substrate are taken.Experimental results indicate that silver particles with uniform diameter and high density were assembled as a sub-monolayer.Raman spectra are enhanced with an enhancement factor of about 106,which means that the self-assembled Ag nanopartices substrate has an excellent SERS-activity.Such substrate can provide an effective way to detect the toxic CV molecules.
出处
《光散射学报》
北大核心
2012年第3期240-244,共5页
The Journal of Light Scattering
基金
国家自然科学基金(10974183
11104252)
教育部博士点基金(20114101110003)
郑州市创新团队基金(2011-3)
河南省科技攻关计划(112102310543)
河南省教育厅自然科学研究项目(12A140002)
关键词
银纳米粒子
自组装
表面增强拉曼光谱
Ag nanoparticles； self-assembly； surface enhanced Raman spectroscopy（SERS）；
