不同受限状态下链硫醇的非线性光学响应

引用本文: 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, 30(12): 2342-2348. doi: 10.3866/PKU.WHXB201410172 shu

Citation: LU Xiao-Lin, ZHOU Jie, LI Bo-Lin. Nonlinear Optical Responses of Thiol Chains in Different Confined States[J]. Acta Physico-Chimica Sinica, 2014, 30(12): 2342-2348. doi: 10.3866/PKU.WHXB201410172 shu

不同受限状态下链硫醇的非线性光学响应

基金项目:
国家自然科学基金(51173169, 21004054) (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 (PAPD 1107037001)

摘要:

以和频(SFG)振动光谱技术探测了正十二硫醇(DDT)在不同受限状态下的分子振动信号, 包括金属基底上的自组装单层(SAM)分子, 放置在二氧化硅基底上的表面DDT化的金纳米粒子以及金纳米粒子的甲苯溶液. 在三种状态下都探测到了来自于DDT分子的振动光谱, 振动光谱的区别提供了在不同受限态下DDT分子的结构信息. 在金属基底上DDT分子排列规整, 放置在二氧化硅基底上的金纳米粒子表面的DDT分子具有一定的柔性, 在空气-甲苯溶液界面金纳米粒子表面的DDT分子高度无序. 此外, 光谱实验显示, 金纳米粒子表面的分子振动信号产生了局域场增强的效应, 相对于金基底上的自组装单层分子而言, 增强系数为10²-10³, 取决于光谱的偏振组合.

关键词:

English

Nonlinear Optical Responses of Thiol Chains in Different Confined States

1.
1. State Key Laboratory of Bioelectronics, School of Biological Science & Medical Engineering, Southeast University, Nanjing 210096, P. R. China;
2. Key Laboratory of Advanced Textile Materials and Manufacturing Technology of Education Ministry, Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China
Received Date: 23 September 2014
Available Online: 27 November 2014
Fund Project:
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

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 DDTmolecules on a ld (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 successfully captured for all 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.

Key words:

Sum frequency generation vibrational spectroscopy
/ Au nanoparticle
/ n-Dodecanethiol
/ Self-assembled monolayer
/ Air-liquid interface

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

不同受限状态下链硫醇的非线性光学响应

English

Nonlinear Optical Responses of Thiol Chains in Different Confined States

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

不同受限状态下链硫醇的非线性光学响应

English

Nonlinear Optical Responses of Thiol Chains in Different Confined States

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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