面向表面图案化的单电荷无机小分子的交替层状自组装和解组装研究
首发时间:2013-05-14
摘要:交替层状自组装技术是构筑厚度可控的功能导向性薄膜的方法,自提出以来得到了深入研究、拓展和广泛应用。通常,在基于静电相互作用所构筑的多层膜中,由于无机寡电荷物质在多层膜中较难实现电荷的翻转以实现组装及其易从多层膜中扩散到体相,人们发展了聚电解质包覆、后渗透等方法来引入寡电荷物质。本文以聚(二烯丙基二甲基氯化铵)和氯金酸钾为两种构筑基元,在氯金酸钾水溶液的pH值为3.7时实现了聚电解质-无机单电荷小分子多层膜的自组装,通过紫外-可见光谱和原子力显微镜对其进行了表征,结果表明该多层膜中所吸附的氯金酸离子的含量随着交替沉积的层数呈线性增长,多层膜的表面粗糙度在1 nm以下;通过在硫酸溶液中超声,该多层膜可以实现解组装。结合所制备多层膜的可控组装/解组装过程和光刻技术,本文实现了表面聚电解质-无机寡电荷小分子多层膜的图案化,期望可以应用于光电器件、表面金属催化和微反应容器等领域。
关键词: 物理化学 交替层状组装 解组装 单电荷小分子 表面图案化
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Layer-by-layer Self-assembly and Disassembly of Single Charged Inorganic Small Molecules: towards Surface Patterning
Abstract:Layer-by-layer self-assembly is a powerful method to construct functionally specific multilayer thin films with controllable thickness. Generally, for the multilayers based on electrostatic interactions, people developed encapsulating small molecules with polyelectrolytes or post-infiltrating to introduce oligo-charged species because it is hard to inverse the surface charge to realize assembly for the oligo-charged inorganic matter, which may diffuse to bulk solution. In this paper, we applied poly(diallyldimethylammonium chloride) (PDDA) and potassium tetrachloroaurate as two building blocks, which could be assembled at a pH value of 3.7 for aqueous solution of potassium tetrachloroaurate. The UV-visible spectra and atomic force microscopy demonstrated that the content of the absorbed metal ions within the multilayer exhibited a linear growth with the depositing bilayer and a low roughness below 1 nm, respectively. Through ultrasonication in sulfuric acid, the as-prepared multilayer could be disassembled. Moreover, combining the controlled assembly and disassembly of the multilayer and photolithography technique, we achieved the surface pattern of the multilayer film with metal ions, which is promising to be used in fields such as photo-electronic devices, surface metal catalysis and micro-reactor and so on.
Keywords: Polymeric chemistry and physics Layer-by-Layer assembly Disassembly Single-charged-molecules Surface patterning
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