摘要
以氧化硅微球(SiO2)为基底,外侧功能团为巯基(SH)的自组装单层为模板,在铁盐浓度2.0mmol/L、pH值2.05、水浴温度为70℃的Fe(NO3)3-HNO3低温液相反应体系中制备了FeOOH纳米薄膜。采用JEM-2100F型场发射高分辨透射电子显微镜对该薄膜的形成过程进行了分析,发现此实验条件下FeOOH纳米薄膜的形成经历了诱导时间(6h)、晶核的形成或膜的初步形成(9h)、晶核的生长或膜的增厚(12h)三个阶段,证明了其形成过程是一个由自组装单层诱导成核再生长的表面成核过程。同时也表明水浴加热12h后,该膜由一系列宽为10nm,长为40nm,垂直SiO2微球表面的纳米棒状针铁矿(α-FeOOH)组成。
The thiol-terminated self-assembled monolayers on microsphere of silica （SH/SiO2 SAMs） were adopted as the template for synthesis the FeOOH nano-films from aqueous system of Fe（NO3 ）3-HNO3 at low temperatures. The experimental conditions were controlled the pH at 2.05, the concentration of iron （Ⅲ ） at 2 retool/L, and the temperature of water bath at 70℃ . The JEM-2100F STEM was employed to analyse the formative processes of FeOOH thin films on the surface of SH/SiO2. It suggested that the nucleation and growth processes of oriented FeOOH nano-films came through three steps, induction time, formation of nuclei and growth of nuclei, which resulted in surface nucleation processes induced by SH/SiO2 . Furthermore, it provides evidences that the FeOOH nano-films on the SH/SiO2 are goethite （α- FeOOH） nanorods with 10nm in the width and 40 nm in the length and the growth orientations of α-FeOOH nanorods in the perpendicular dierection of the SH/SiO2 surfaces.
出处
《电子显微学报》
CAS
CSCD
2008年第2期97-101,共5页
Journal of Chinese Electron Microscopy Society
基金
国家自然科学基金资助项目(No.40672020,No.40372028)~~
