Enhanced Redox Chemistry in Quantized Colloids

In order to quantify this effect it is necessary to have a technique for controlling this property. Before discussing various methods, the question arises what happens if an electron is transferred to or taken away from a small semiconductor particle This problem has been studied in two ways. In the first, electrons were injected into the conduction band of a semiconductor particle from hydrated electrons, the latter being generated in H2O by pulse radiolysis [63]. In the second, the colloidal solution is investigated in an electrochemical cell, using two inert Pt electrodes. At the negatively polar- 

Band positions of quantized particles can also be determined via redox reactions. Considering, for instance, the electron transfer from the reduced species, R of a redox system into a particle according to the reaction 

These are important examples because certain photoreduction processes may only be achieved with small particles of a given material. This has been demonstrated for H2 

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