Reactions on colloidal semiconductor particles
Reactions on colloidal semiconductor particles
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胶体半导体颗粒的反应
DOI：
10.1002/bbpc.19870910443
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
H. Welter
中科院分区：
文献类型：
--
作者：
A. Henglein;A. Fojtík;H. Welter
无机胶体如硫化镉常用作光化学反应的敏化剂和催化剂。在这些反应中，根据电极动力学中发展的概念来描述，电子在溶液中的颗粒和分子之间转移。极小的粒子（Q粒子）通常具有与大晶体不同的光学和催化性质。这些效应是由于光吸收（尺寸量子化）产生的电荷载流子的空间限制。携带过量电子的CdS粒子在吸收边附近的波长处强烈改变其吸收。这种效应归因于过量电子对导致这些粒子中的最低激子态的光学跃迁的影响。
Inorganic colloids such as cadmium sulfide are often used as sensitizers and catalysts for photochemical reactions. In these reactions, which are described in terms of the concepts developed in electrode kinetics, electrons are transferred between the particles and molecules in the solution. Extremely small particles (Q-particles) often have optical and catalytic properties different from those of the macrocrystals. These effects are due to the restriction in space of the charge carriers produced by light absorption (size quantization). CdS particles carrying an excess electron strongly change their absorption at wavelengths near the absorption edge. This effect is attributed to the influence of the excess electron on the optical transition leading to the lowest excitonic state in these particles.