4-n-pentyl-4″-cyano-p-terphenyl 介晶的真空沉积薄膜：它们的电子光谱和分子聚集体结构,Thin Solid Films

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4-n-pentyl-4″-cyano-p-terphenyl 介晶的真空沉积薄膜：它们的电子光谱和分子聚集体结构
Thin Solid Films ( IF 2.0 ) Pub Date : 2000-07-01 , DOI: 10.1016/s0040-6090(00)00933-0
Takafumi Sumiyoshi , Iwao Takahashi , Yasuyuki Tsuboi , Hiroshi Miyasaka , Akira Itaya , Tsuyoshi Asahi , Hiroshi Masuhara

摘要测量了沉积在亲水性和疏水性石英基底上的 4-n-pentyl-4″-cyano-p-terphenyl (5CT) 薄膜的吸收光谱和荧光光谱，并与其各种溶液及其纯净形式（结晶、液体）的吸收光谱和荧光光谱进行了比较。晶相和各向同性相）。此外，将这些光谱与已经详细研究过的 4-n-烷氧基-4'-氰基联苯（nOCB，n=8、9、10、12）的光谱进行了比较。5CT 沉积薄膜的吸收光谱和荧光光谱几乎与基板性质和沉积温度无关。这种行为与观察到的 nOCB 不同。吸收光谱与其溶液样品的吸收光谱不同，表明沉积膜中5CT分子的氰基三联苯基团形成H-聚集体状结构，其长轴彼此平行且相对垂直于沉积膜中的堆叠方向。荧光光谱也与其纯样品和溶液样品的荧光光谱不同。还使用原子力显微镜 (AFM) 研究了沉积膜的表面形态。AFM图像显示，沉积的薄膜由许多小片状晶体组成，这与氰基三联苯的H-聚集体状结构一致，并且随着时间的推移，小片状晶体转变为针状晶体。结构转变与吸收和荧光光谱随时间的变化相关。

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Vacuum-deposited films of mesogen of 4-n-pentyl-4″-cyano-p-terphenyl: their electronic spectra and molecular aggregate structures

Abstract Absorption and fluorescence spectra of 4-n-pentyl-4″-cyano-p-terphenyl (5CT) films deposited on hydrophilic and hydrophobic quartz substrates were measured and compared with those of its various solutions and of its neat forms (crystalline, liquid crystal, and isotropic phases). Further, these spectra were compared with those of 4-n-alkoxy-4′-cyanobiphenyls (nOCB, n=8, 9, 10, 12), which had been studied in detail already. The absorption and fluorescence spectra of the 5CT-deposited films were almost independent of substrate property and deposition temperature. This behavior was different from those observed for nOCB. The absorption spectra differed from those of its solution samples and suggested that cyanoterphenyl groups of 5CT molecules in the deposited films form H-aggregate-like structures with their long axes parallel to each other and relatively perpendicular to the stacking direction in the deposited films. The fluorescence spectra were also different from those of its neat and solution samples. Surface morphology of the deposited films was also investigated using atomic force microscopy (AFM). AFM images showed that the deposited films consisted of a number of small plate crystals, which was consistent with H-aggregate-like structures of cyanoterphenyl groups, and that the small plate crystals transformed to needle ones with time. The structural transformation correlated with the absorption and fluorescence spectral changes with time. The deposition processes of 5CT as revealed by in situ fluorescence spectra during deposition were simple compared with those of nOCB and are discussed on the basis of the in situ fluorescence spectra and the AFM images.

更新日期：2000-07-01

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