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以经过硅烷化后玻璃片为基底,之后吸附金纳米种子,采用柠檬酸钠为还原剂,在荧光灯照射条件下还原硝酸银,制备出基底表面具有银纳米粒子聚集结构的材料.采用透射电镜、扫描电镜和紫外可见分光光度计对产物的形貌和性质进行了表征,并考察银纳米粒子的形貌对其薄膜基底SERS活性的影响.结果表明:随着光照时间增加至16 h,金种子长大为平均粒径110 nm的不规则状多晶银纳米粒子,且出现双层粒子堆积.基底上纳米粒子的吸收光谱上出现了由银粒子的表面等离子体激元偶极子耦合引发的强烈吸收峰:随着光照时间的变化,耦合峰在600～813 nm波段内移动.光照时间为12 h后得到的SERS活性基底具有最强的SERS信号.
After the silanized glass plate was taken as the substrate, gold nanoparticles were adsorbed, and sodium citrate was used as the reducing agent to reduce the silver nitrate under the fluorescent lamp irradiation to prepare the silver nano-particles aggregated structure on the substrate surface. Scanning electron microscopy and UV-vis spectrophotometer were used to characterize the morphology and properties of the product, and the effect of silver nanoparticles morphology on the SERS activity of the film was investigated. The results showed that with the increase of illumination time to 16 h, Irregular polycrystalline silver nanoparticles grown to an average particle size of 110 nm appeared and double layer deposition occurred.The absorption spectra of nanoparticles on the substrate were caused by surface plasmon dipole coupling of silver particles Strong absorption peak: With the change of illumination time, the coupling peak moves in the wave band of 600 ~ 813 nm.The SERS active substrate obtained after 12 h light irradiation has the strongest SERS signal.