Luminescent behavior of cadmium sulfide quantum dots for gallic acid estimation

Singh, Suman and Garg, Sourav and Chahal, Jitender and Raheja, Khushboo and Singh, Deepak and Singla, M.L. (2013) Luminescent behavior of cadmium sulfide quantum dots for gallic acid estimation. Nanotechnology, 24 (11). p. 115602. ISSN 0957-4484 (Print) 1361-6528 (Online)

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Thioglycolic acid capped cadmium sulfide (CdS/T) quantum dots have been synthesized using wet chemistry and their optical behavior has been investigated using UV–visible absorption and fluorescence spectroscopy. The role of the capping agent, sulfide source concentration, pH and temperature has been studied and discussed. Studies showed that alkaline pH leads to a decrease in the size of quantum dots and reflux temperature above 70 °C resulted in red-shift of emission spectra which is due to narrowing of the bandgap. Further, to reduce the toxicity and photochemical instability of quantum dots, the quantum dots have been functionalized with polyethylene glycol (PEG), which resulted in a 20% enhancement of the fluorescence intensity. The application potential of CdS/T-PEG quantum dots was further studied using gallic acid as a model compound. The sensing is based on fluorescence quenching of quantum dots in the presence of gallic acid, and this study showed linearity in the range from 1.3 × 10−8 to 46.5 × 10−8 mM, with a detection limit of 3.6 × 10−8 mM.

Item Type: Article
Subjects: CSIO > Chemistry
CSIO > Nano Science and Nano Technology
Divisions: Agri - Instrumentation
Depositing User: Ms. J Shrivastav
Date Deposited: 10 May 2013 13:04
Last Modified: 10 May 2013 13:04

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