Polyelectrolyte/magnetite nanoparticle multilayers:: Preparation and structure characterization
Polyelectrolyte/magnetite nanoparticle multilayers:: Preparation and structure characterization
复制标题
DOI：
10.1021/la700963h
复制
发表时间：
2007-11-20
期刊：
影响因子：
3.9
通讯作者：
Moehwald, H.
中科院分区：
文献类型：
--
作者：
Grigoriev, D.;Gorin, D.;Moehwald, H.
采用逐层吸附技术制备了含有不同数量氧化铁（Fe3O4）纳米颗粒层的聚电解质复合平面膜。纳米复合材料组件，其特征在于椭圆偏振，紫外可见光谱，和原子力显微镜。多层膜厚度随层数N增加到12呈线性增长，反映了该参数在此范围内的广泛特性。折射率的更复杂的行为是由多层结构的变化引起的，特别是对于较厚的纳米复合材料。的纳米复合材料的结构的定量分析提供了一个经典的和修改后的有效介质的方法，考虑到光吸收的影响，由Fe3O4纳米粒子的纳米复合材料的复折射率和膜厚度的所有组件的贡献进行比较。共吸附水对它们的性能的主导影响被发现是纳米复合膜的另一个有趣的特性。这种效果，以及可能的薄膜性能调制的光，进行了讨论。
Polyelectrolyte composite planar films containing a different number of iron oxide (Fe3O4) nanoparticle layers have been prepared using the layer-by-layer adsorption technique. The nanocomposite assemblies were characterized by ellipsometry, UV-vis spectroscopy, and AFM. Linear growth of the multilayer thickness with the increase of the layer number, N, up to 12 reflects an extensive character of this parameter in this range. A more complicated behavior of the refractive index is caused by changes in the multilayer structure, especially for the thicker nanocomposites. A quantitative analysis of the nanocomposite structure is provided comparing a classical and a modified effective medium approach taking into account the influence of light absorption by the Fe3O4 nanoparticles on the complex refractive index of the nanocomposite and contributions of all components to film thickness. Dominant influence of co-adsorbed water on their properties was found to be another interesting peculiarity of the nanocomposite film. This effect, as well as possible film property modulation by light, is discussed.