Title: Application of aqueous phase CdSe quantum dots for formaldehyde sensing

Authors: Deepika; Rakesh Dhar; Suman Singh

Addresses: Department of Physics, MKJK College, Rohtak-124001, Haryana, India ' Department of Applied Physics, Guru Jambheshwar University of Science and Technology, Hisar-125001, Haryana, India ' Central Scientific Instruments Organization (CSIR-CSIO), Chandigarh, 160030, India

Abstract: Thioglycolic acid capped cadmium selenide (CdSe) quantum dots have been synthesised in aqueous phase and their optical properties have been studied using UV-visible absorption and fluorescence spectroscopy. Quantum dots have been characterised using TEM and XRD. The potential application of CdSe quantum dots are further studied using formaldehyde as a model compound. The sensing is based on fluorescence quenching of quantum dots in the presence of formaldehyde, and this work showed linearity in the range from 0.15 to 1.05 ppm, with a detection limit of 0.06 ppm.

Keywords: quantum dots; aqueous phase; optical property; spectroscopy.

DOI: 10.1504/IJNP.2019.097911

International Journal of Nanoparticles, 2019 Vol.11 No.1, pp.1 - 11

Received: 07 Apr 2018
Accepted: 14 Aug 2018
Published online: 22 Feb 2019 *

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