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Capping agents; quantum confinement; poly-dispersed; luminescent.

Cadmium selenide quantum dots (CdSe QDs) were synthesized in aqueous phase by the freezing temperature injection technique using different capping agents (viz. thioglycolic acid, 1-thioglycerol, L-cysteine). Absorption spectra of CdSe QDs exhibited a blue shift as compared to its bulk counterpart, which is an indication of quantum confinement effect. The photoluminescence spectra of CdSe QDs confirmed that the particles are poly-dispersed and possess enhanced luminescent property, depending upon the chemical nature of capping agents. The QDs have been characterized by Fourier-transform infrared spectroscopy, atomic absorption spectroscopy and transmission electron microscopy. Further, antimicrobial activity of as-prepared QDs has also been investigated using the disk diffusion method.

Deepika¹ Rakesh Dhar¹ Suman Singh² Atul Kumar¹

1. Department of Applied Physics, Guru Jambheshwar University of Science and Technology, Hisar 125 001, India
2. Central Scientific Instruments Organization (CSIR–CSIO), Chandigarh 160 030, India

Published

September 2015

Manuscript received

12 August 2014

Accepted

16 April 2015