Manganous ion dictated morphology change and ferromagnetism in CdS nanocrystals
Source abstract
Abstract
We report a simple chemical route for converting the dimorphic CdS nanocrystals into pure hexagonal structure by loading * 5% Mn 2? into CdS in presence of a surfactant rather than under harsh conditions reported earlier. Differential scanning calorimetric measurement was used to quantify the percentages of cubic and hexagonal components at lower manganese ion loading, which correlated well with the Short and Steward procedure using X-ray diffraction analysis. Annealing of all lower (\ 5% ) manganese ion-loaded samples transforms the cubic component into its hexagonal form. Systematic var- iation of manganese ion concentration in the range of 0-5 % helps tune in a new combination of photolu- minescence bands, composed of a band edge, surface and manganese d-d emissions. The manganese ions located inside the CdS matrix studied by electron paramagnetic resonance (EPR) reveal progressively changing presence of (i) distorted tetrahedral nature of isolated Mn 2? and (ii) cluster formation through dipolar and/or exchange coupling arising from
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Research context
OpenAlex topics: Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films · Copper-based nanomaterials and applications
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