表面增強拉曼光譜研究正己硫醇分子在銀基底表面自組裝過程的時間和濃度因素影響
發(fā)布時間：2018-08-05 14:38
【摘要】：表面增強拉曼光譜(SERS)是一種具有超靈敏檢測能力的譜學技術,可以在單分子水平上檢測分子結構的動態(tài)變化過程。烷基硫醇的自組裝膜是一類典型的類晶態(tài)有序結構薄膜,在仿生、材料、電子和化學等領域有著重要的應用,越來越受到人們的關注。本文利用SERS對正己硫醇(hexanethiol,HT)分子在銀基底上的吸附和組裝過程進行研究,對HT的拉曼和自組裝膜SERS光譜進行了指認。根據C—S,C—C和CH3鍵結構的反式和旁式的特征光譜信息,研究HT吸附在銀納米粒子表面的構象,以及自組裝膜結構的有序性。研究了吸附時間和濃度兩個因素對成膜規(guī)律產生的影響。實驗結果表明,當HT溶液濃度較高時,HT單層膜成膜速率較快,且有序性較好;當HT溶液濃度較低時,HT單層膜成膜速率較慢,且有序性較差。這一研究結果對成膜動力學以及烷基硫醇的有序單層膜的制備具有重要的指導意義,為基于烷基硫醇的自組裝單層膜在防腐、器件和生物方面的應用奠定了基礎。
[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.
【作者單位】： 吉林大學超分子結構與材料國家重點實驗室;長春大學食品工程與園林學院;
【基金】：國家自然科學基金項目(201103062,21273091,21221063,201411140235) 博士后科學基金項目(2014M561286)資助
【分類號】：O657.37
本文編號：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.
【作者單位】： 吉林大學超分子結構與材料國家重點實驗室;長春大學食品工程與園林學院;
【基金】：國家自然科學基金項目(201103062,21273091,21221063,201411140235) 博士后科學基金項目(2014M561286)資助
【分類號】：O657.37
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