CdSiO sub(2) and ZnSiO sub(2) core-shell nanocomposites: Synthesis and optical properties

Reverse micellar route was used to synthesize CdSiO sub(2) and ZnSiO sub(2) core-shell nanocomposites. Titanium hydroxyacylate has been used for the first time as the shell-forming agent for the formation of TiO sub(2) shell over CdS and ZnS which ensures the formation of shell over the core nanopar...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2010-06, Vol.363 (1-3), p.130-134
Main Authors: Vaidya, Sonalika, Patra, Amitava, Ganguli, Ashok Kumar
Format: Article
Language:English
Subjects:
Cadmium sulfides
Compact disks
Nanocomposites
Nanomaterials
Nanoparticles
Nanostructure
Titanium dioxide
Zinc sulfides
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Summary:Reverse micellar route was used to synthesize CdSiO sub(2) and ZnSiO sub(2) core-shell nanocomposites. Titanium hydroxyacylate has been used for the first time as the shell-forming agent for the formation of TiO sub(2) shell over CdS and ZnS which ensures the formation of shell over the core nanoparticle due to its slow rate of hydrolysis and thus forms core-shell nanocomposites. HRTEM studies show 3-5 nm sulphide nanoparticles forming the core. A strong quantum confinement for bare nanoparticles and core-shell nanocomposites was observed from the blue shift of the absorption band of these nanocomposites. The size of CdS and ZnS, calculated from spectroscopic studies, corroborated with that observed from HRTEM studies. 2-Mercaptoethanol (used as a capping agent) was found to restrict the size of the CdS core in these nanostructures which resulted in further shift of the absorption and emission bands towards lower wavelength. No quenching in the emission band of CdS was observed for the core-shell nanostructures. In contrast to CdSiO sub(2), the optical properties of ZnSiO sub(2) core-shell nanostructures do not show any shift in the absorption band when compared to bare ZnS nanoparticles.
ISSN:0927-7757
DOI:10.1016/j.colsurfa.2010.04.030