Hojeij Mohamad, Su Bin, Tan Shuxin, Mériguet Guillaume, Girault Hubert H
Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Federale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland.
ACS Nano. 2008 May;2(5):984-92. doi: 10.1021/nn700295v.
We perform in this paper a kinetic study of the photoelectrochemical responses of nanoporous thin photoactive films. The films were fabricated by by a layer-by-layer assembly of positively charged polyelectrolytes (poly-l-Lysine, pLys) and negatively charged semiconductor nanoparticles (NPs) on a carboxylic acid terminated alkanethiol-modified gold electrode. Two types of NPs were used to build uniform films: cadmium selenide (CdSe) and cadmium selenide/cadmium sulfide core/shell (CdSe@CdS). Large photocathodic and photoanodic currents were recorded for CdSe and CdSe@CdS sensitized films, respectively. A theoretical model of the photocurrent responses was developed to analyze the kinetics of photoinduced processes and coupled reactions, showing that the multilayer films behave as homogeneous nanoporous semiconducting photoelectrodes.
在本文中，我们对纳米多孔薄光活性薄膜的光电化学响应进行了动力学研究。这些薄膜是通过在羧酸封端的烷硫醇修饰的金电极上逐层组装带正电的聚电解质（聚-L-赖氨酸，pLys）和带负电的半导体纳米颗粒（NPs）制备而成。使用了两种类型的纳米颗粒来构建均匀的薄膜：硒化镉（CdSe）和硒化镉/硫化镉核壳结构（CdSe@CdS）。分别记录了CdSe和CdSe@CdS敏化薄膜的大光阴极电流和光阳极电流。建立了光电流响应的理论模型，以分析光诱导过程和耦合反应的动力学，结果表明多层薄膜表现为均匀的纳米多孔半导体光电极。
