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  • Title: Dithiol-mediated immobilization of CdS nanoparticles from reverse micellar system onto Zn-doped silica particles and their high photocatalytic activity.
    Author: Hirai T, Nanba M, Komasawa I.
    Journal: J Colloid Interface Sci; 2002 Aug 01; 252(1):89-92. PubMed ID: 16290766.
    Abstract:
    Cds nanoparticles, prepared in a reverse micellar system, were immobilized directly onto alkanedithiol-modified Zn-doped silica particles, which were themselves prepared via hydrolysis of tetraethylorthosilicate in the presence of Zn(NO(3))(2) followed by contact with dithiol molecules. The resulting CdS-Zn-SiO(2) composite was then used as a photocatalyst for the generation of H(2) from 2-propanol aqueous solution. Under UV irradiation (lambda>300 nm), a high photocatalytic activity was observed for the CdS-Zn-SiO(2) composite material. This is effected by electron transfer from the photoexcited ZnS (dithiol-bonded Zn on SiO(2)) to CdS nanoparticles. The photocatalytic activity is increased with a decrease in the number of methylene groups in the dithiol molecules, according to the rank order 1,10-decanedithiol <1,6-hexanedithiol <1,2-ethanedithiol.
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