物理化学学报Issue(12)：2342-2348,7.DOI:10.3866/PKU.WHXB201410172
不同受限状态下链硫醇的非线性光学响应
Nonlinear Optical Responses of Thiol Chains in Different Confined States
摘要
Abstract
The molecular vibrational signals of n-dodecanethiol (DDT) were detected in different confined states using sum frequency generation (SFG) vibrational spectroscopy. Samples with three different confined states were used, including a self-assembled monolayer (SAM) of DDT molecules on a gold (Au) substrate, DDT surface-functionalized Au nanoparticles on a silica substrate, and surface-functionalized Au nanoparticles dispersed in a toluene solution. The vibrational spectra of the DDT molecules were successful y captured for al three samples, and the spectral differences provided evidence of the different confined structures. On the Au substrate, the DDT molecules orderly packed together;on the silica substrate, the DDT molecules attached to the Au nanoparticle surfaces were somehow flexible;and at the air-toluene interface, the DDT molecules attached to the Au nanoparticle surfaces were highly disordered. The spectral analysis indicated that the molecular vibrational signals generated from the Au nanoparticle surfaces were enhanced because of the localized enhanced fields near the Au nanoparticle surfaces, with the enhancement factors of 102-103 over the SAM of DDT molecules on the Au substrate, depending on the selected polarization combination.关键词
和频振动光谱/金纳米粒子/正十二硫醇/自组装单层/气液界面Key words
Sum frequency generation vibrational spectroscopy/Au nanoparticle/n-Dodecanethiol/Self-assembled monolayer/Air-liquid interface分类
化学化工引用本文复制引用
卢晓林,周杰,李柏霖..不同受限状态下链硫醇的非线性光学响应[J].物理化学学报,2014,(12):2342-2348,7.基金项目
The project was supported by the National Natural Science Foundation of China (51173169,21004054), Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China, Zhejiang Province Human Resources and Social Security Bureau, China, and Priority Academic Program Development of Jiangsu Higher Education Institutions, China (PAPD 1107037001).国家自然科学基金(51173169,21004054),教育部留学归国人员科研启动基金,浙江省留学人员科技活动项目择优资助项目和江苏高校优势学科建设工程项目(PAPD 1107037001)资助 （51173169,21004054）
