Optoelectronic Study on Starch Capped Cadmium Sulfide Nanoparticles

Authors Ekta1, Vikas Lahariya1, Kamal Kumar Kushwaha2, Saral Kumar Gupta3

1Amity School of Applied Science, Amity University Haryana, Gurugarm, 122413 Haryana, India

2Department of Physics, Government Engineering College, Jabalpur (M.P.) 482002, India

3Department of Physics, Banasthali Vidyapeeth, Rajasthan, India

Issue Volume 11, Year 2019, Number 6
Dates Received 13 August 2019; revised manuscript received 05 December 2019; published online 13 December 2019
Citation Ekta, Vikas Lahariya, et al., J. Nano- Electron. Phys. 11 No 6, 06002 (2019)
DOI https://doi.org/10.21272/jnep.11(6).06002
PACS Number(s) 78.40.Fy, 78.55.Et
Keywords Soluble Starch, Cadmium sulfide, UV-Vis Absorption (2) , Photoluminescence (17) , FTIR spectroscopy.

Green synthesis method using soluble starch as a stabilizing agent in an aqueous medium is used to prepare CdS nanoparticles. It has an advantage over the conventional method involving toxic reagents. Here in, a study on the optical properties of CdS nanoparticles prepared by green synthesis method with different pH values is being reported. The samples were prepared by chemical route and characterized by scanning electron microscopy, UV-Vis absorption spectroscopy, Fourier transform infrared spectroscopy, and photoluminescence spectroscopy. The experimental results showed a blue shift in absorption wavelength with respect to bulk CdS that indicates small size formation of particles and quantum confinement effect with increase in the effective energy band gap. The size was estimated by the Brus equation and empirical Yu model. Photoluminescence spectra show band edge emission and deep trap states emission. The CIE coordinates verify the emission of CdS in visible region. The blue shift in band edge emission and red shift in trap state emission are observed with lower pH values. The existence of functional groups was identified by Fourier transform infrared spectroscopy, it confirms the presence of starch as a stabilizing agent. Variation in pH modifies the optical properties and reduction in the size of cadmium sulfide nanoparticles.

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