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Open Access Nano Express

Evolution of ZnS Nanoparticles via Facile CTAB Aqueous Micellar Solution Route: A Study on Controlling Parameters

SK Mehta1*, Sanjay Kumar1, Savita Chaudhary1, KK Bhasin1 and Michael Gradzielski2

Author Affiliations

1 Department of Chemistry and Centre for Advanced Studies in Chemistry, Panjab University, Chandigarh, 160014, India

2 Stranski-Laboratorium für Physikalische Chemie und Theoretische Chemie, Institut für Chemie, TU Berlin, Sekr. TC 7, Strasse des 17. Juni 124, D-10623, Berlin, Germany

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Nanoscale Research Letters 2008, 4:17-28  doi:10.1007/s11671-008-9196-3

Published: 6 November 2008

Abstract

Synthesis of semiconductor nanoparticles with new photophysical properties is an area of special interest. Here, we report synthesis of ZnS nanoparticles in aqueous micellar solution of Cetyltrimethylammonium bromide (CTAB). The size of ZnS nanodispersions in aqueous micellar solution has been calculated using UV-vis spectroscopy, XRD, SAXS, and TEM measurements. The nanoparticles are found to be polydispersed in the size range 6–15 nm. Surface passivation by surfactant molecules has been studied using FTIR and fluorescence spectroscopy. The nanoparticles have been better stabilized using CTAB concentration above 1 mM. Furthermore, room temperature absorption and fluorescence emission of powdered ZnS nanoparticles after redispersion in water have also been investigated and compared with that in aqueous micellar solution. Time-dependent absorption behavior reveals that the formation of ZnS nanoparticles depends on CTAB concentration and was complete within 25 min.

Keywords:
ZnS nanoparticles; Optical absorption; XRD; SAXS; FTIR-spectroscopy