表面增强拉曼光谱研究正己硫醇分子在银基底表面自组装过程的时间和浓度因素影响
发布时间：2018-08-05 14:38
【摘要】：表面增强拉曼光谱(SERS)是一种具有超灵敏检测能力的谱学技术,可以在单分子水平上检测分子结构的动态变化过程。烷基硫醇的自组装膜是一类典型的类晶态有序结构薄膜,在仿生、材料、电子和化学等领域有着重要的应用,越来越受到人们的关注。本文利用SERS对正己硫醇(hexanethiol,HT)分子在银基底上的吸附和组装过程进行研究,对HT的拉曼和自组装膜SERS光谱进行了指认。根据C—S,C—C和CH3键结构的反式和旁式的特征光谱信息,研究HT吸附在银纳米粒子表面的构象,以及自组装膜结构的有序性。研究了吸附时间和浓度两个因素对成膜规律产生的影响。实验结果表明,当HT溶液浓度较高时,HT单层膜成膜速率较快,且有序性较好;当HT溶液浓度较低时,HT单层膜成膜速率较慢,且有序性较差。这一研究结果对成膜动力学以及烷基硫醇的有序单层膜的制备具有重要的指导意义,为基于烷基硫醇的自组装单层膜在防腐、器件和生物方面的应用奠定了基础。
[Abstract]:Surface-Enhanced Raman Spectroscopy (SERS) is a very sensitive spectroscopic technique which can be used to detect the dynamic changes of molecular structure at the single molecular level. Self-assembled films of alkyl mercaptan are a kind of typical crystalline ordered structure films, which have important applications in biomimetic, material, electronic and chemical fields, and have attracted more and more attention. In this paper, the adsorption and assembly of hexanethiolHT on silver substrate were studied by SERS, and the Raman and SERS spectra of HT were identified. The conformation of HT adsorbed on the surface of silver nanoparticles and the structure ordering of self-assembled films were studied according to the characteristic spectra of C-Sn-C-C and CH3 bond structures. The effects of adsorption time and concentration on film formation were studied. The experimental results show that the film formation rate of monolayer films is faster and the order is better when the concentration of HT solution is higher, and the film formation rate is slower and the order property is poor when the concentration of HT solution is lower. The results are of great significance to the kinetics of film formation and the preparation of ordered monolayers of alkyl mercaptan, which will lay a foundation for the application of self-assembled monolayers based on alkyl mercaptan in anticorrosion, devices and biology.
【作者单位】： 吉林大学超分子结构与材料国家重点实验室;长春大学食品工程与园林学院;
【基金】：国家自然科学基金项目(201103062,21273091,21221063,201411140235) 博士后科学基金项目(2014M561286)资助
【分类号】：O657.37
本文编号：2166093
[Abstract]:Surface-Enhanced Raman Spectroscopy (SERS) is a very sensitive spectroscopic technique which can be used to detect the dynamic changes of molecular structure at the single molecular level. Self-assembled films of alkyl mercaptan are a kind of typical crystalline ordered structure films, which have important applications in biomimetic, material, electronic and chemical fields, and have attracted more and more attention. In this paper, the adsorption and assembly of hexanethiolHT on silver substrate were studied by SERS, and the Raman and SERS spectra of HT were identified. The conformation of HT adsorbed on the surface of silver nanoparticles and the structure ordering of self-assembled films were studied according to the characteristic spectra of C-Sn-C-C and CH3 bond structures. The effects of adsorption time and concentration on film formation were studied. The experimental results show that the film formation rate of monolayer films is faster and the order is better when the concentration of HT solution is higher, and the film formation rate is slower and the order property is poor when the concentration of HT solution is lower. The results are of great significance to the kinetics of film formation and the preparation of ordered monolayers of alkyl mercaptan, which will lay a foundation for the application of self-assembled monolayers based on alkyl mercaptan in anticorrosion, devices and biology.
【作者单位】： 吉林大学超分子结构与材料国家重点实验室;长春大学食品工程与园林学院;
【基金】：国家自然科学基金项目(201103062,21273091,21221063,201411140235) 博士后科学基金项目(2014M561286)资助
【分类号】：O657.37
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