Cant Nicola E, Zhang Hao-Li, Critchley Kevin, Mykhalyk Tetyana A, Davies Geoffrey R, Evans Stephen D
Department of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, U.K.
J Phys Chem B. 2003 Dec 11;107(49):13557-62. doi: 10.1021/jp035388+.
The formation of multilayer films of organothiol-stabilized gold nanoparticles and polyelectrolyte, synthesized using the "layer-by-layer" technique, has been investigated. The formation of such films requires the alternation of surface charge with each layer deposited and is thus amenable to study by the Kelvin probe technique. The early stages of multilayer film formation have been studied using a combination of X-ray photoelectron spectroscopy, spectroscopic ellipsometry, and Kelvin probe microscopy. Our results suggest that the polyelectrolyte/nanoparticle film can be considered as a wide-band-gap semiconductor with a depletion width, at the substrate/film interface, extending several nanometers into the film. From our ellipsometry data, we are able to provide optical constants for these hybrid organic/inorganic films.
研究了采用“逐层”技术合成的有机硫醇稳定的金纳米颗粒与聚电解质多层膜的形成。这种膜的形成需要每沉积一层表面电荷就交替变化，因此适合用开尔文探针技术进行研究。利用X射线光电子能谱、光谱椭偏仪和开尔文探针显微镜相结合的方法研究了多层膜形成的早期阶段。我们的结果表明，聚电解质/纳米颗粒膜可被视为一种宽带隙半导体，在基底/膜界面处的耗尽宽度延伸到膜内几纳米。根据我们的椭偏仪数据，我们能够提供这些有机/无机混合膜的光学常数。
