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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。
The silver nanoparticles were prepared by the reduction of silver nitrate with trisodium citrate and the silver nanoparticles were self-assembled by modifying 3-aminopropyl-triethoxysilane (APTES) on the glass surface. The samples were analyzed and characterized by UV-Vis absorption spectroscopy and scanning electron microscopy (SEM). The test results show that the silver nanoparticles are relatively uniform in size and high in assembly density, and are basically distributed in the form of submonolables on the surface of the substrate. The surface enhanced Raman spectroscopy (SERS) of self-assembled substrate with crystal violet (CV) as probe molecule was further studied. The Raman enhancement factor of this substrate was found to be on the order of 106. The results show that silver nanoparticles self-assembled substrate has a good SERS enhancement effect, which provides an effective method for the detection of trace CV.