CdS quantum dots for measurement of the size-dependent optical properties of thiol capping |
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| Authors: | S S Liji Sobhana M Vimala Devi T P Sastry Asit Baran Mandal |
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| Institution: | (1) Chemical Laboratory, Central Leather Research Institute, Council of Scientific and Industrial Research, Chennai, 600 020, India;(2) Bioproducts Laboratory, Central Leather Research Institute, Chennai, 600 020, India; |
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| Abstract: | Abstract The optical- and size-dependent properties of CdS quantum dots (QDs) were analyzed in the presence and absence of different
capping agents in aqueous medium. The QDs have been characterized by UV–Vis, Photoluminescence, Fourier-transform infrared
spectroscopy, X-ray diffraction, and Fluorescence lifetime measurements. QDs with the presence of thiol group in cubic phase
with small grain size were observed in XRD and decrease in particle size of the same with increase in band gap is deduced
through UV–Vis and XRD studies. The FT-IR spectrum confirms the interaction of thiol group with CdS. Fluorescence lifetime
of capped QDs was higher compared to uncapped CdS QDs. The surface passivation of thiol group on CdS is shown in photoluminescence
studies. |
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