作　　者： ; ; ;

机构地区： 宿州学院化学与生命科学学院自旋电子与纳米材料安徽省重点实验室

出　　处： 《化学学报》 2009年第18期2095-2101,共7页

摘　　要： 利用层层静电自组装技术将聚烯丙胺盐酸盐(PAH)和四氯合钯酸根离子(24PdCl-)交替沉积在基底上,然后用硼氢化钠还原,构筑了含钯纳米粒子的PAH/Pd纳米复合薄膜.通过紫外-可见吸收光谱(UV-Vis)、扫描电子显微镜(FESEM),X射线光电子能谱(XPS)和循环伏安(CV)等手段对复合膜的组装、成分、微结构、表面形貌和光学性能进行了测试分析.FESEM图形显示膜表面有一定的粗糙度,膜上生成了粒径在50～100 nm范围的钯纳米粒子;UV-Vis结果显示多层膜在特征吸收峰处的吸光度数值随膜双层数增加逐渐增大,呈良好的线性关系,表明多层膜是均匀组装的;XPS结果证实了复合膜上有Pd生成,CV结果说明复合薄膜对尿酸的氧化具有较好的电催化活性,有望用于电化学传感器. Nanocomposite thin films containing Pd nanoparticles were formed by alternating adsorption of poly（allylamine hydrochloride） and PdCl4^2- using a layer-by-layer self-assembly technique and subsequent postdeposition reduction of the PdCl4^2- ions by sodium borohydride （NaBH4）. The composition, structure, and properties of the composite films were characterized by ultraviolet-visible spectroscopy （UV-Vis）, field emission scanning electron microscopy （FESEM）, X-ray photoelectron spectroscopy （XPS）, and cyclic voltammetry （CV）. FESEM images indicate that the composite film has a rough surface and the size of Pd nanoparticles is in the range of 50- 100 nm. The UV-Vis characteristic absorbances of PAH and Pd increase almost linearly with the number of bilayers, which suggests that the deposition process be regular and highly reproducible from layer to layer. XPS result confirms the formation of Pd nanoparticles in the films. The multilayer films exhibit good electrocatalytic activity for the oxidation of uric acid, which may be used in electrochemical biosensors in future.

关 键 词： 聚烯丙胺盐酸盐 纳米复合薄膜 层层白组装 多层膜

领　　域： [理学] [理学] [一般工业技术]