摘要
通过自组装方法以对巯基苯胺(PATP)为偶联分子,在石英基片上构筑了多种形貌的银钠米粒子单层结构和三明治结构.研究了组装膜在不同激发线下表面增强拉曼散射(SERS)的增强差异.研究结果表明,单层基底和三明治基底中偶联分子的SERS信号因银纳米粒子间的电磁场耦合而显著增强,且在三明治结构中增强更加明显.对复合SERS基底增强因子进行计算可知,复合SERS基底的表面等离子体共振(SPR)峰与激发线的匹配程度越好,其增强因子越大.在三明治结构中更易发生PATP分子转变为对巯基偶氮苯(DMAB)分子的激光诱导催化偶联反应.另外,该激光诱导催化偶联反应与激发波长密切相关.
Metal-molecule-metal sandwich structures on quartz slides were constructed by the self-assembly of Ag nanoparticles with various shapes via p-aminothiophenol （PATP） molecules as linkers. These sandwich structures were characterized by extinction spectroscopy and surface-enhanced Raman scattering（SERS） spec- troscopy using different excitation lasers. The results demonstrated that SERS intensities of PATP in sandwich structures were much stronger than those on silver nanoparticle monolayers. The calculated enhancement fac- tors （EFs） of PATP on the composite SERS substrates showed that the large EFs appeared when the SPR peaks of SERS substrates well matched excitation lines. In these sandwich structures, PATP molecules tended to form a new surface species （p, p＇-dimercaptoazobenzene, DMAB ） under a laser-induced catalytic coupling reaction. In addition, the laser-induced catalytic coupling reaction was closely related to excitation wave- lengths.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第10期2308-2314,共7页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:91027010,21073073,20903043,20973075)
高等学校博士学科点专项科研课题(批准号:20090061120089)
超分子结构与材料国家重点实验室开放课题(批准号:SKLSSM201125)资助
关键词
银纳米粒子
电磁场增强
表面增强拉曼散射
Silver nanoparticles
Electromagnetic field enhancement
Surface-enhanced Raman scattering（ SERS ）
