论文部分内容阅读
利用溶剂引导的无序-有序相转变的方法制备了二噻吩并[3,2-b:2’,3’-d]噻吩-2,5-二羧酸(A)和二噻吩并[2,3-b:3’,2’-d]噻吩-2,5-二羧酸(B)的自组织薄膜.利用原子力显微镜(atomic force microscopy,AFM)研究了两种化合物分子在基底上的排列方式,发现化合物A分子在云母基底上以一定角度取向排列,而化合物B单分子层在云母基底上以“平卧”式排列.结合紫外可见(ultra violet-visible,UV-Vis)吸收光谱、荧光光谱和导电原子力显微镜(conductive atomic force microscopy,C-AFM)对化合物A和化合物B薄膜的光学性质以及微区电子传输行为进行了研究.结果表明,形成J-聚集体的化合物A与化合物B相比,其吸收峰值和发光峰位都发生较大红移,并且化合物A比化合物B的微区电导大三个数量级以上,在基底上的不同聚集结构和取向是导致两种分子微区电导巨大差异的主要原因.
The dithieno [3,2-b: 2 ’, 3’-d] thiophene-2,5-dicarboxylic acid (A) and dithieno [ 2,3-b: 3 ’, 2’-d] thiophene-2,5-dicarboxylic acid (B) was studied by atomic force microscopy (AFM) The results showed that the compound A molecules were aligned at an angle on the mica substrate, while the compound B monolayers were arranged on the mica substrate in a “horizontal and horizontal” arrangement. The combination of UV-Vis ) Optical spectra, fluorescence spectra and C-AFM were used to investigate the optical properties and the electron transport behaviors of the compounds A and B. The results showed that the formation of J-aggregate compounds A has a larger red shift than the compound B in both absorption peak and emission peak, and the compound A is more than three orders of magnitude larger than that of the compound B. The different aggregation structures and orientations on the substrate lead to two molecules The main reason for the great difference in the conductance of the micro-area.