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Structural, optical, photoluminescence and electrochemical behaviours of Mg, Mn dual-doped ZnS quantum dots

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Abstract

Mg, Mn dual doped ZnS quantum dots (QDs) have been synthesized via co-precipitation method. XRD results revealed that the dual doped ZnS QDs have a cubic structure without forming secondary phase. The particle size was ranged in ~ 2 nm. TEM study portrayed particle assembly and its agglomeration. The scanning electron microscope (SEM) study showed the surface smoothening on samples for Mg addition. Fourier transform infra-red (FTIR) and energy dispersive x-ray (EDX) analysis evidenced the substitution of Mg into Mn:ZnS QDs. UV–visible studies showed that absorption peak intensity was increased and redshifted, shortening of band-gap with increasing Mg doping concentration. A weak UV emission and strong red emission were received from the photoluminescence (PL) investigations. The electrochemical analysis showed a better electrical property for Mg = 2% concentration. Since Mg = 2% doping ratio offers better optical absorption, PL emission, catalytic properties, these materials shall be selected as a suitable candidate for solar and optoelectronic device applications.

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Acknowledgements

The authors are grateful to the management of Karpagam Academy of Higher Education, Coimbatore to form the Fundamental Research Group in order to carry out the research on the Applied Sciences stream.

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Authors and Affiliations

  1. Department of Physics, Faculty of Engineering, Karpagam Academy of Higher Education, Coimbatore, Tamilnadu, 641 021, India

    P. Sakthivel

  2. Department of Electronics and Communication Engineering, Karpagam Academy of Higher Education, Coimbatore, Tamilnadu, 641 021, India

    G. K. D. Prasanna Venkatesan & Kamalraj Subramaniam

  3. Department of Chemistry, Faculty of Engineering, Karpagam Academy of Higher Education, Coimbatore, Tamilnadu, 641 021, India

    P. Muthukrishnan

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Sakthivel, P., Prasanna Venkatesan, G.K.D., Subramaniam, K. et al. Structural, optical, photoluminescence and electrochemical behaviours of Mg, Mn dual-doped ZnS quantum dots. J Mater Sci: Mater Electron 30, 11984–11993 (2019). https://doi.org/10.1007/s10854-019-01551-2

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