Abstract
GaSe layers with thicknesses ranging from a monolayer to 100 nm are successfully mechanically exfoliated for use in gas sensing. In combination with density functional theory calculations, general guidelines to determine the number of layers using Raman spectra are presented. With decreasing layer numbers, quantum confinement induces a red‐shift for out‐of‐plane modes and a blue‐shift for in‐plane modes. The relative Raman shifts of the out‐of‐plane vibrational modes and grow exponentially with decreasing stack thickness from 100 to 1 layers. Moreover, the change in first‐order temperature coefficient (χ) also increases exponentially as the number of layers is reduced, with the value of the first‐order temperature coefficient of the mode of monolayer GaSe (≈−1.99 × 10−2 cm−1 K−1) being almost double that of 100 layer GaSe (≈−1.22 × 10−2 cm−1 K−1). Finally, the exfoliated GaSe is used for gas sensing and shows high sensitivity, displaying a minimum detection limit of 4 ppm for NH3 at room temperature, confirming the potential of mechanically exfoliated GaSe in high‐sensitivity gas sensors.
Bibliography
Wu, Y., Zhang, D., Lee, K., Duesberg, G. S., Syrlybekov, A., Liu, X., Abid, M., Abid, M., Liu, Y., Zhang, L., Coileáin, C. Ã., Xu, H., Cho, J., Choi, M., Chun, B. S., Wang, H., Liu, H., & Wu, H. (2016). Quantum Confinement and Gas Sensing of Mechanically Exfoliated GaSe. Advanced Materials Technologies, 2(1). Portico.
Authors
18
- Yecun Wu (first)
- Duan Zhang (additional)
- Kangho Lee (additional)
- Georg S. Duesberg (additional)
- Askar Syrlybekov (additional)
- Xiao Liu (additional)
- Mourad Abid (additional)
- Mohamed Abid (additional)
- Yanqi Liu (additional)
- Lisheng Zhang (additional)
- Cormac Ó Coileáin (additional)
- Hongjun Xu (additional)
- Jiung Cho (additional)
- Miri Choi (additional)
- Byong Sun Chun (additional)
- Haomao Wang (additional)
- Huajun Liu (additional)
- Han‐Chun Wu (additional)
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58
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Dates
Type | When |
---|---|
Created | 8 years, 9 months ago (Nov. 7, 2016, 8:55 a.m.) |
Deposited | 1 year, 10 months ago (Oct. 6, 2023, 11:18 a.m.) |
Indexed | 1 month ago (July 30, 2025, 3:41 a.m.) |
Issued | 8 years, 9 months ago (Nov. 7, 2016) |
Published | 8 years, 9 months ago (Nov. 7, 2016) |
Published Online | 8 years, 9 months ago (Nov. 7, 2016) |
Published Print | 8 years, 8 months ago (Jan. 1, 2017) |
Funders
3
Saudi Aramco
10.13039/501100007809
Region: Asia
gov (Local government)
Labels
1
- Saudi Arabian Oil Co.
Awards
1
- 6600028398
Science Foundation Ireland
10.13039/501100001602
Region: Europe
gov (National government)
Labels
1
- SFI
Awards
2
- PI_10/IN.1/I3030
- 12/RC/2278
Seventh Framework Programme
10.13039/501100004963
Region: Europe
gov (National government)
Labels
5
- EC Seventh Framework Programme
- European Commission Seventh Framework Programme
- EU Seventh Framework Programme
- European Union Seventh Framework Programme
- FP7
Awards
1
- 604391
@article{Wu_2016, title={Quantum Confinement and Gas Sensing of Mechanically Exfoliated GaSe}, volume={2}, ISSN={2365-709X}, url={http://dx.doi.org/10.1002/admt.201600197}, DOI={10.1002/admt.201600197}, number={1}, journal={Advanced Materials Technologies}, publisher={Wiley}, author={Wu, Yecun and Zhang, Duan and Lee, Kangho and Duesberg, Georg S. and Syrlybekov, Askar and Liu, Xiao and Abid, Mourad and Abid, Mohamed and Liu, Yanqi and Zhang, Lisheng and Coileáin, Cormac Ó and Xu, Hongjun and Cho, Jiung and Choi, Miri and Chun, Byong Sun and Wang, Haomao and Liu, Huajun and Wu, Han‐Chun}, year={2016}, month=nov }