Authors: Sain, S.; Patra, S.; Pradhan, S.K.

Source: Journal of Physics D: Applied Physics, Volume 44, Number 7, 23 February 2011 , pp. 75101-75108(8)

Publisher: IOP Publishing

Abstract:

Cd_xZn_1−xS (x = 0.0 to 1.0, at 0.1 interval) quantum dots (QDs) were synthesized by mechanical alloying of the stoichiometric mixture of elemental Cd, Zn and S powders at room temperature under Ar in record minimum time. The Cd_0.5Zn_0.5S QDs were formed after 25 min and the Cd_0.1Zn_0.9S QDs after 160 min of milling. The x-ray and high resolution transmission electron microscope characterizations reveal the presence of both major and minor zinc-blende and wurtzite phases and stacking faults in these QDs. Lattice parameters of both these phases decrease and the optical band-gaps increase continuously with increasing Zn concentrations. A very distinct change in colour of these QDs from blue to red is noticed with increasing Cd concentration from 0 to 1, indicating that optical band-gap varies with varying composition.

Document Type: Research article

DOI: http://dx.doi.org/10.1088/0022-3727/44/7/075101

Publication date: 2011-02-23

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