电化学偶联层层组装纳米粒子薄膜及其垂直组分调控

发布时间：2018-04-30 01:16

本文选题：层层组装 + 电化学　；参考：《东北师范大学》2015年硕士论文

【摘要】：基于自下而上(bottom-up)的自组装修饰制备具有纳米尺度结构的功能化材料越来越受到化学、物理、材料科学等学科的关注。层层组装(Layer-by-Layer Assembly,Lb L)是一种能够在分子尺度上调控复合物层状结构的制备方法,并因其通用,简单,低消耗及组装快速等优点备受研究者关注。层层组装的高度通用性和兼容性持续创造着新概念、新材料,新方法和新应用。然而,传统层层组装方法要求两种被组装分子之间具有互补的相互作用力(如静电,氢键给体和受体,电子给体和受体相互作用等)作为成膜的驱动力。这个特点阻碍了层层组装方法有效调控薄膜垂直结构的能力,并且很难制备没有辅助组装分子的单组份多层薄膜。在本论文中,我们将N-烷基咔唑基团的电化学偶联反应,代替两分子间互补的相互作用引入到纳米粒子层层组装领域,制备了单组份纳米粒子薄膜并方便的调控多种纳米粒子复合物薄膜的垂直组分。具体内容包括:(1)设计并合成了两种带咔唑基团的有机小分子配体8-(9氢-咔唑-9-基)辛基-1-磷酸(COPA)和6-(9氢-咔唑-9-基)己基-1-硫醇(CHT),利用原位修饰和后续配体交换的方法将电活性咔唑基团修饰到Pb S、Cd S、Au纳米粒子表面,得到了可电化学聚合的纳米材料。(2)基于N-烷基咔唑配体的电化学偶联反应,应用循环伏安方法制备了单组份纳米粒子Lb L薄膜;通过调节循环伏安的扫描圈数控制偶联程度,成功制备了多种纳米粒子体相杂化薄膜和纳米层状结构。这种简单的电化学偶联层层组装过程能够制备透明,稳定的光活性纳米粒子薄膜,并将这种溶液态非真空条件下加工的薄膜应用到光伏器件中,初步研究了其作为光探测器的性能。
[Abstract]:Self-assembly modification based on bottom-up (bottom-up) has attracted more and more attention in chemistry, physics, material science and so on. Layer-by-Layer assembly LbL (LbL) is a preparation method that can regulate the lamellar structure of composites on molecular scale, and has attracted much attention for its advantages of generality, simplicity, low consumption and fast assembly. Layer-upon-layer assembly with high versatility and compatibility continues to create new concepts, new materials, new methods and new applications. However, the traditional layer-by-layer assembly method requires complementary interaction between the two assembled molecules (such as electrostatic, hydrogen bond donor and receptor, electron donor and receptor interaction) as the driving force of film formation. This feature hinders the ability of layer-by-layer assembly method to effectively regulate the vertical structure of thin films, and it is difficult to prepare single component multilayer films without auxiliary assembly molecules. In this thesis, the electrochemical coupling reaction of N-alkyl carbazole group was introduced into the field of layered assembly of nanocrystalline particles instead of the complementary interaction between the two molecules. The single component nanoparticle films were prepared and the vertical components of the composite films were easily regulated. Two kinds of organic small molecular ligands with carbazole group, 8-f9 hydrocarbazol-9-yl) octyl -1-phosphate (COPAA) and 6-9 hydrocarbazol-9-yl) hexyl-1-mercaptan (CHT) were designed and synthesized, and exchanged by in situ modification and subsequent ligand exchange. The electroactive carbazole group was modified to the surface of Pb Schi-CD Su au nanoparticles. Based on the electrochemical coupling reaction of N-alkyl carbazole ligands, single component nanoparticles LbL thin films were prepared by cyclic voltammetry, and the coupling degree was controlled by adjusting the number of scanning cycles of cyclic voltammetry. A variety of nanocrystalline bulk hybrid films and layered nanostructures have been successfully prepared. This simple electrochemical coupling layer by layer assembly process can be used to prepare transparent and stable photoactive nanoparticles thin films, and the films processed in the solution state in non-vacuum condition can be applied to photovoltaic devices. Its performance as a photodetector is preliminarily studied.
【学位授予单位】：东北师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383

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