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Charge-transfer-based Gas Sensing Using Atomic-layer MoS2
Open accessAbstract
Two-dimensional (2D) molybdenum disulphide (MoS2) atomic layers have a strong potential to be used as 2D electronic sensor components. However, intrinsic synthesis challenges have made this task difficult. In addition, the detection mechanisms for gas molecules are not fully understood. Here, we report a high-performance gas sensor constructed using atomic-layered MoS2 synthesised by chemical vapour deposition (CVD). A highly sensitive and selective gas sensor based on the CVD-synthesised MoS2 was developed. In situ photoluminescence characterisation revealed the charge transfer mechanism between the gas molecules and MoS2, which was validated by theoretical calculations. First-principles density functional theory calculations indicated that NO2 and NH3 molecules have negative adsorption energies (i.e., the adsorption processes are exothermic). Thus, NO2 and NH3 molecules are likely to adsorb onto the surface of the MoS2. The in situ PL characterisation of the changes in the peaks corresponding to charged trions and neutral excitons via gas adsorption processes was used to elucidate the mechanisms of charge transfer between the MoS2 and the gas molecules.
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Metadata
- Authors
- Cho, B., Hahm, M. G., Choi, M., Yoon, J., Kim, A. R., Lee, Y.-J., Park, S.-G., Kwon, J.-D., Kim, C. S., Song, M., Jeong, Y., Nam, K.-S., Lee, S., Yoo, T. J., Kang, C. G., Lee, B. H., Ko, H. C., Ajayan, P. M., & Kim, D.-H.
- Venue
- Scientific Reports
- Published
- 2015-01-27
- Volume
- 5
- Issue
- 1
- Pages
- 8052-8052
- ISSN
- 2045-2322 (ISSN-L)
- OpenAlex
- W1965542092
- Cited by
- 649
- References
- 34
- FWCI
- 24.51
- Type
- journal article
- Language
- en
- Open access
- gold
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