Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 44, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/44/7/075101
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- University Grants Commission (UGC), India
- University Grants Commission (UGC)
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CdxZn1-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 Cd0.5Zn0.5S QDs were formed after 25 min and the Cd0.1Zn0.9S 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.
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