山嵛酸Langmuir膜结合氨气扩散控制生长碱式硝酸锌薄膜

利用山嵛酸Langmuir膜有机模板控制和氨气扩散动力学控制相结合的仿生矿化方法,制备了大面积均匀致密且沿(200)晶面取向生长的Zn5(OH)8(NO3)2·2H2O薄膜。采用扫描电子显微镜(SEM)、X射线光电子能谱(XPS)和X射线衍射(XRD)分别对样品形貌、表面成分及其晶型进行了表征。结合π-A曲线研究了薄膜生长的驱动力,对材料结构的形成原因进行了探讨。结果表明,Langmuir膜模板诱导结合动力学控制下的无机晶体生长体系为在室温下合成特殊结构和性能的薄膜材料提供了一种可行的方法。

Thin Films Formation of Zinc Hydroxide Nitrate Under a Behenic Acid Langmuir Monolayer Combined with Ammonia Vapor Diffusion

Compact large area Zn5(OH)8(NO3)2·2H2O thin films with uniform morphology and well-orientation along the (200) plane were fabricated by using a unusual biomimetic method in which a behenic acid (BA) Langmuir monolayer was used for the organic template as the usual biomimetic process, and a gradient of ammonia vapor-diffusion was introduced to the system to provide an addition of kinetic control. The morphology, urface chemical composition and crystallinity of the thin films were characterized using scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy, respectively. The film formation process was monitored by surface pressure-surface area isotherms, and the reason for the structure formation was discussed. The results prove that such a system in which the diffusion of a volatile catalyst concentration combined a Langmuir monolayer template is a good formation method for well-oriented thin films growth at room temperature.