玻璃基底上不规则银纳米结构的生长及其光学性质的研究  

Preparation of silver nanostructure on glass substrates and their spectral properties

作　　者：易有根[1] 何花[1] 陈艳[1] 徐习斌[1] 江少恩[2] 郑志坚[2] 唐永建[2] 

机构地区：[1]中南大学物理科学与技术学院,长沙410083 [2]中国工程物理研究院高温高密度等离子体物理国家重点实验室,绵阳621900

出　　处：《原子与分子物理学报》2012年第1期118-124,共7页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(10804101);国家重点基础研究发展计划基金(2007CB815102);等离子体物理国防科技重点实验室基金(9140C6805020806)

摘　　要：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.Silver nanostructures on the surface of glass substrate have been synthesized by small gold seeds with the assistance of Na3-citrate. The effect of surface morphology of thin films of silver nanoparticles degree on the SERS activity of the substrate was studied by transmission electron microscopy, scanning electron microscopy and UV-Vis spectroscopy. The results showed that the silver nanostructure of the substrates which finally grew up to 110 nm 16 hour irradiation took on irregular shape, and some of nanoparticles stacked to form bilayer. A new broad band appeared in the absorption spectra of the substrates due to the interparticle dipole-dipole coupling of surface plasmon resonance response of the triangular silver nanoplate particles, which red shifted 600~813 nm as the particles grow up, indicating the intensification of the coupling. The strongest SERS signal of SERS-Active Substrate was fabricated after 12 h.

关 键 词：银纳米粒子 玻璃基底 种子-光照法 表面等离子体共振 拉曼光谱 

分 类 号：TG146.32[一般工业技术—材料科学与工程] TF123.73[金属学及工艺—金属材料]