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Depreciative behavior of nanotwinning towards emission in Ag doped CdS QDs

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Abstract

Microstructural defects play a critical role in flourishing various properties of materials. Here in this article, the effect of Ag substitution on the various properties of CdS quantum dots (QDs) is studied. Ag doped CdS QDs are synthesized using chemical co-precipitation, a simple, cost-effective method suitable for mass-production. High resolution transmission electron microscopy (HRTEM) images show dopant induced change in density and types of microstructural defects. The development of multiple nanotwinning at the cost of stacking faults as well as single twin boundary via the substitution of Ag in CdS lattice is noticed. In present study, a strong quantum confinement is observed and confirmed by the crystallite sizes estimated via X-ray diffraction (XRD) and TEM studies. A systematic enhancement in the bandgap and reduction in crystallite size are observed with increasing concentration of dopant. The atomic concentration of element and chemical bonding in CdS QDs are studied using X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) respectively. Unlike other elemental dopants, QDs when doped with Ag with the varying concentration exhibit a non-systematic emission behaviour with increasing concentration which is correlated to the microstructural defects and confinement strength.

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Acknowledgements

The author (PK) is pleased to acknowledge the Inter University Accelerator Centre, New Delhi, India, University Grants Commission (UGC), New Delhi, India and Central University of Jammu for providing financial assistance under the project IUAC/XIII.7/UFR-61310, UGC-Startup grant (No. F.30-352/2017(BSR)) and CUJ/Acad/Proj-PHY/2017/98 respectively. The author (TK) is thankful to the University Grants Commission (UGC), New Delhi, India for providing scholarship under NF-OBC scheme (NFO-2018-19-OBC-JAM-69666), Junior Research Fellowship (JRF) scheme. The authors are also thankful to Mr. Ambuj Misra from Inter University Accelerator Centre (IUAC) for providing kind support in TEM measurements.

Funding

The corresponding author Pragati Kumar received financial supports from Inter University Accelerator Centre, New Delhi, India, University Grants Commission (UGC), New Delhi, India and Central University of Jammu under the project IUAC/XIII.7/UFR-61310, UGC-Startup grant (No. F.30–352/2017(BSR)) and CUJ/Acad/Proj-PHY/2017/98 respectively. The first author Tania Kalsi received fellowship from the University Grants Commission (UGC), New Delhi, India under NF-OBC scheme (NFO-2018–19-OBC-JAM-69666), Junior Research Fellowship (JRF) scheme.

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Authors and Affiliations

  1. Nano-Materials and Device Lab, Department of Nanoscience and Materials, Central University of Jammu, Rahya-Suchani, Samba, Jammu, J&K, 181143, India

    Tania Kalsi & Pragati Kumar

  2. Centre for Materials Science, Department of Physics, Faculty of Engineering, Karpagam Academy of Higher Education, Coimbatore, Tamil Nadu, 641021, India

    P. Sakthivel

  3. Department of Apparel and Textile Technology, Guru Nanak Dev University Amritsar, Amritsar, Punjab, 143005, India

    Sachin Kumar Godara

  4. Department of Physics, Indian Institute of Technology, Kanpur, Uttar Pradesh, 208016, India

    Rohit Medwal

  5. Department of Physics, Indian Institute of Technology, Jammu, Jammu, 181221, India

    Nupur Sxaena

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  1. Tania Kalsi
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  2. P. Sakthivel
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Contributions

First Author: TK executed the experiments, analysed data and wrote the first draft of manuscript. Co-author: PS review and edited the first draft of manuscript. Co-author: SKG performed UV–Visible and PL measurement and provided help during analysis. Co-author: RM performed XPS measurement and helped in analysis. Corresponding Author: PK conceptualized the problem, supervised the first author during experiments and analysis, review and write the final draft of paper. Corresponding Author: NS conceptualized the problem, formally analysed data, review and write the final draft of manuscript.

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Correspondence to Nupur Sxaena or Pragati Kumar.

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Kalsi, T., Sakthivel, P., Godara, S.K. et al. Depreciative behavior of nanotwinning towards emission in Ag doped CdS QDs. Opt Quant Electron 55, 996 (2023). https://doi.org/10.1007/s11082-023-05248-z

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