Toll Free Helpline (India): 1800 1234 070

Rest of World: +91-9810852116

NAAS Rating: 5.03, Impact Factor: RJIF 5.98 | Free Publication Certificate
updates
NAAS Rating: 5.03 new
Vol. 7, Issue 3 (2018)

Study of variation of band gap with the size of CdSe quantum dots

Author(s):
Deepika and Rakesh Dhar
Abstract:
Herein, we report the synthesis of CdSe Quantum dots of tunable particle size in aqueous phase using freezing temperature injection technique. As prepared CdSe quantum dots were characterized using UV-Vis Absorption Spectroscopy, Photoluminescence Spectroscopy, Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy. By varying the concentration of cadmium and selenium precursors with thioglycolic acid as the capping ligand, this synthesis method allow us to synthesize Quantum Dots of size ranging from 3.4 to 3.7nm (estimated from optical absorption edge measurements). Absorption spectra of CdSe QDs exhibit a blue shift as compared to its bulk counterpart which is an indication of quantum confinement effect. The photoluminescence (PL) spectra of CdSe quantum dots confirm that the particles are mono-dispersed and possess enhanced luminescent property. Band gap of CdSe quantum dots was found to be decreases with increase in particle size.
Pages: 41-43  |  479 Views  11 Downloads
How to cite this article:
Deepika and Rakesh Dhar. Study of variation of band gap with the size of CdSe quantum dots. The Pharma Innovation Journal. 2018; 7(3): 41-43.
Journals List Click Here Research Journals Research Journals
Call for book chapter