Electron irradiation effects on TGA-capped CdTe quantum dots

Pai, Chethan S and Joshi, MP and Mohan, Raj S and Deshpande, UP and Dhami, TS and Khatei, Jayakrishna and Rao, Koteshwar KS and Sanjeev, Ganesh (2013) Electron irradiation effects on TGA-capped CdTe quantum dots. In: Journal of Physics D: Applied Physics, 46 (17). 175304_1-175304_7.

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Abstract

8MeV electron irradiation effects on thioglycolic acid (TGA)-capped CdTe quantum dots (QD) are discussed in this study. CdTe QDs were characterized using x-ray diffraction (XRD), transmission electron microscope (TEM) and x-ray photoelectron spectroscopy (XPS). Steady-state and time-resolved emission spectroscopy and UV-visible absorption spectroscopy were performed before and after irradiation with 8MeV electrons. XRD and TEM confirm the growth of TGA-capped CdTe QDs. The photoemission wavelength, intensity and lifetimes were found to vary with electron dose. At lower doses, they were found to be increasing (red-shift of photoluminescence (PL) peak and intensity) while the intensity decreased at higher electron doses. The observed changes in PL property, XPS and XRD analysis suggest possible epitaxial growth of the CdS shell on the CdTe core. This work demonstrates electron beam induced formation of the CdS layer on the CdTe core, which is a key step towards growth of the water soluble CdTe/CdS core-shell structure for biomedical labelling applications.

Item Type:	Journal Article
Publication:	Journal of Physics D: Applied Physics
Publisher:	IOP Publishing Ltd
Additional Information:	Copyright of this article belongs to IOP Publishing Ltd.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	28 May 2013 05:50
Last Modified:	28 May 2013 05:50
URI:	http://eprints.iisc.ac.in/id/eprint/46566

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