CdS@TiO2 and ZnS@TiO2 core-shell nanocomposites: synthesis and optical properties

Vaidya, Sonalika ; Patra, Amitava ; Ganguli, Ashok Kumar (2010) CdS@TiO2 and ZnS@TiO2 core-shell nanocomposites: synthesis and optical properties Colloids and Surfaces A: Physicochemical and Engineering Aspects, 363 (1-3). pp. 130-134. ISSN 0927-7757

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Reverse micellar route was used to synthesize CdS@TiO2 and ZnS@TiO2 core-shell nanocomposites. Titanium hydroxyacylate has been used for the first time as the shell-forming agent for the formation of TiO2 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 CdS@TiO2, the optical properties of ZnS@TiO2 core-shell nanostructures do not show any shift in the absorption band when compared to bare ZnS nanoparticles.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Reverse Micelles; Core-shell Nanocomposites; Optical Properties
ID Code:62024
Deposited On:16 Sep 2011 03:58
Last Modified:16 Sep 2011 03:58

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