Abstract
A systematic density functional investigation on the structural, electronic and optical properties of the growth of (ZnO)6 cluster unit in the series of (ZnO)6n for n = 1–9 is reported in this paper. Different electronic properties of (ZnO)6n nanoclusters are analyzed in terms of HOMO–LUMO gap (HLG), ionization potential (IP), electron affinity (EA), chemical hardness (η) and electrophilicity index (ω), which all shows a zigzag behavior as the size of (ZnO)6n clusters increases. The electronic energy gain (ΔE) of the clusters identified an exceptionally stable ‘magic’ nanocluster, viz. (ZnO)42. Frontier orbitals analysis results indicate easy electron transfer in (ZnO)42 nanocluster system. The optical absorption spectra confirm that the magic (ZnO)42 nanocluster is active in the visible range (λ = 406.8 Å) of electromagnetic spectrum. Interestingly, like zigzag electronic properties, similar optical switching toward the growth of (ZnO)6 unit is also observed. The simulation results of electronic properties as well as the infrared spectra of magic (ZnO)42 cluster will open up a vista to the experimentalists for its possible synthesis, which in turn will help in the development of the visibly active magic (ZnO)42 nanocluster with novel applications in the fields of quantum dots or assembled materials.
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Acknowledgements
DRR is thankful to the SERB, New Delhi, Govt. of India for financial support (Grant Nos. EMR/2016/005830 and CRG/2020/002634). SMR is thankful to the SERB, New Delhi, Govt. of India for financial support (Grant No. TAR/2021/000150).
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BRM contributed to investigation, results, and writing—original draft. EVS contributed to investigation, results, and writing—original draft. SMR contributed to conceptualization, supervision, results analysis, writing—review and editing. DRR contributed to conceptualization, supervision, results analysis, writingβ—review and editing, resources.
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The authors dedicate this work to Professor Pratim Kumar Chattaraj on his 65th birth anniversary.
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Mehta, B.R., Shah, E.V., Mondal Roy, S. et al. (ZnO)42 nanocluster: a novel visibly active magic quantum dot under first principle investigation. Theor Chem Acc 142, 19 (2023). https://doi.org/10.1007/s00214-023-02958-1
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DOI: https://doi.org/10.1007/s00214-023-02958-1