On Set and Control of Cellular Patterns in Organic-Inorganic Hybrid Film

研究了几微米厚的有机-无机薄膜。当Ti、Zr烷氧化物和氨基硅烷偶联剂（氨基丙基三甲氧基硅烷：APTS）加入到起始溶胶中后，用浸渍法制备的膜呈现出明显的细胞模式。为了明确其中一组细胞模式的条件和溶胶的光学性质，用激光显微镜和原子力显微镜对膜表面进行了观察。结果表明：(1)大气中的水分对细胞形态的发生是不可避免的。(2)随着水合聚合反应的进行，初始溶胶中形成纳米级颗粒，并随着反应时间的延长而生长。(3)通过AFM观察获得细胞的三维图像。细胞由几纳米~几百纳米的山状壁包围的山谷状中心组成。它们的清晰和深度之间存在着关系。(4)杂化膜中电池的形成机制是：第一步是纳米级颗粒（TiO_2、ZrO_2或SiO_2纳米颗粒）在起始溶胶中生成，第二步是这些纳米颗粒通过Marangoni对流流动。

Organic-inorganic film of several micrometers in thickness has been investigated. The films fabricated by dipping technique showed the remarkable cellular patterns, when such reagents as Ti, Zr alkoxides and silane coupling agent having amino groups (aminopropyltrimethoxysilane : APTS) were involved in the starting sol.In this investigation, to make clear the condition of on set of the cellular patterns, optical properties of the sol, observation of the film surfaces by laser microscopy and atomic force microscopy (AFM) have been carries out. The results were summarized as follows,(1) Moisture in the atmosphere is inevitable for the onset of the cellular patterns.(2) Along with the hydration-polymerization reaction, nanometer-sized particles were formed in the starting sol and they were grown with increasing the reaction time.(3) The 3-D image of the cell was obtained by the AFM observation. The cell was composed of the valley center surrounded by the mountain- like wall of few nanometer 〜hundred of nanometer. There were the relations between their clearness and the depth.(4) The formation mechanism of the cell in the hybrid film is : the first step is nanometer-sized particles (TiO_2, ZrO_2 or SiO_2 nanoparticles) generation in the starting sol, the second step is the flow of these nanoparticles by the Marangoni convection.