Abstract
The emerging hexagonal buckled 2D silicene holds promising electronic properties for new applications in the field of nanoelectronics. In this study, we have investigated the adsorption of DNA nucleobases such as adenine (A), cytosine (C), guanine (G), and thymine (T) on silicene surface. The binding affinity of studied nucleobases on silicene surface at M062X/6-31G* level of theory showed the following trend: C > G > T > A, which is in good agreement with previous results. The nucleobases are physisorbed on the silicene surface as observed with the non-covalent interactions (NCI) analysis; however, the atoms in molecule (AIM) analysis suggest that such bases have slight covalency while interacting with the surface. The semi-metallic behavior in silicene-nucleobases complexes was analyzed from total density of states (TDOS) and partial density of states (PDOS) plots. The spectral properties of nucleobases adsorbed on silicene surface can be monitored using infrared and Raman vibrational frequencies. The IR and Raman spectral studies showed to distinguish the adsorption of cytosine and adenine with larger shifts in the former case (63 cm−1) compared to the later one (14 cm−1). Such variations in the IR and Raman vibrational frequencies can be exploited for the monitoring and detection of nucleic acid biomarkers adsorbed on 2D silicene surface.
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Acknowledgements
S.B. is thankful to AcSIR Ghaziabad, Uttar Pradesh-201002, India, for Ph.D. registration. S.B. acknowledges CSIR-SRF (31/028(0279)/2020-EMR-I) for the financial support. CSIR-CSMCRI registration number is 229/2022. We thank the anonymous reviewer for suggestions and comments that have helped us to improve the paper.
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Surjit Bhai carried out all the DFT calculations and drafted the manuscript. Bishwajit Ganguly has analyzed the results and reviewed the original draft of the manuscript. All the authors have read and approved the manuscript for submission.
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Bhai, S., Ganguly, B. 2D silicene nanosheets for the detection of DNA nucleobases for genetic biomarker: a DFT study. Struct Chem 35, 25–37 (2024). https://doi.org/10.1007/s11224-023-02144-w
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DOI: https://doi.org/10.1007/s11224-023-02144-w