Microwave probing of electronic processes in small particle suspensions

摘要: The electronic properties of small particles semiconducting materials have attracted considerable attention because they can mediate the photolytic decomposition water1–6; a property which may prove useful in solar energy storage devices. Information about initial electron–hole state formed on photolysis and subsequent conduction electron transfer processes occurring at particle–solvent interface has previously been gained indirectly through steady-state flash-photolysis studies colloidal solutions that also contain well known donor and/or acceptor molecules. A more direct, ‘electrical’ method probing such systems might be expected to lead detailed understanding primary photoionization event ensuing bulk surface processes. We demonstrate here feasibility direct microscopic semiconductor (TiO2, CdS Se) suspended nonpolar liquid medium.