Electrophoretic deposition of CdS colloidal nanoparticles onto an amorphous silicon membrane

A method for producing nanoporous silicon membranes suspended over the microchannels of a silicon matrix is proposed. Solid concentrates of CdS nanoparticles are produced by electrophoretic deposition onto this thin-film carrier. The results of complex studies that confirm the formation of a Si–CdS composite in the regions of ion-current flow through the porous membrane are reported. It is shown that the gradual accumulation of semiconductor nanoparticles encapsulated in thioglycolic-acid organic shells occurs during electrophoresis. It is inferred that a similar technological approach is applicable also to biological substances, whose dosed concentrates can be used in biomedical investigations.