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Potential application of C-MoS2 monolayer for identifying lung cancer biomarkers in exhaled breath: a DFT study

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Abstract

This paper presents a computational study investigating the potential of MoS2 and C-doped MoS2 monolayers as breath sensors for detecting Volatile Organic Compounds (VOCs) associated with lung cancer (LC). The sensing characteristics of MoS2 and C-MoS2 towards LC-related VOCs were explored using Density Functional Theory (DFT) calculations. The exchange-correlation energy was calculated using the Generalized Gradient Approximation (GGA) with the Perdew-Burke-Ernzerhof (PBE) functional. Our finding showed VOCs associated with LC such as C3H4O, C4H8O, C5H8, and C6H12 interacted with the MoS2 monolayer, with adsorption energies − 0.80 eV, -0.82 eV, -1.01 eV, and − 0.99 eV, respectively. However, the interaction is greatly enhanced by C-doped MoS2 with adsorption energies − 2.04 eV, -2.12 eV, -1.85 eV, and − 2.25 eV, respectively for C3H4O, C4H8O, C5H8 and C6H12. Additionally, we investigated the impact of gas adsorption on the bandgap of the materials to assess their electrical variations. Pristine MoS2 exhibited minimal changes in bandgap upon VOC adsorption. In contrast, C-MoS2 displayed a remarkable increase in bandgap, ranging from 0.71 eV to 1.56 eV, compared to its initial value of 0.69 eV. This significant increase indicates an improved sensitivity of C-MoS2 as a breath sensor for LC-related VOCs. Furthermore, we reported structural variations, density of states (DOS), charge transfer, work function, and recovery time analysis. Our results demonstrate that C-MoS2 exhibits promising characteristics for detecting VOCs associated with LC.

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Acknowledgements

This work was supported by the All-India Council for Technical Education (AICTE) Govt. of India under the Research Promotion Scheme for North-East Region (RPS-NER) vide ref.: File No. 8-139/RIFD/RPS-NER/Policy-1/2018-19 (PI: Bikash Sharma).

The author (Sanat Kr. Das) acknowledges the TMA Pai University Research Fund-Award of Minor Grant, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Sikkim (Sanction No.: 6100/SMIT/R&D/Project/12/2020, dated 20th July 2020).

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Prasanna Karki: Methodology, Investigation, Writing. Bibek Chettri: Methodology, Investigation. Pronita Chettri: Supervision. Sanat Kr. Das: Supervision. Bikash Sharma: Conceptualization, Visualization, Supervision, Editing.

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Correspondence to Bikash Sharma.

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Karki, P., Chettri, B., Chettri, P. et al. Potential application of C-MoS2 monolayer for identifying lung cancer biomarkers in exhaled breath: a DFT study. Microsyst Technol (2024). https://doi.org/10.1007/s00542-024-05636-9

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  • DOI: https://doi.org/10.1007/s00542-024-05636-9

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