Version 1
: Received: 4 December 2023 / Approved: 4 December 2023 / Online: 7 December 2023 (08:38:15 CET)
How to cite:
Wu, H.; Tang, M.; Tong, P.; Hang, Y.; Zhao, J. Chemical Vapor Deposited 2D MoN Nanosheets as Stable and Uniform Surface Enhanced Raman Scattering Substrate with Thickness Dependent Sensitivity. Preprints2023, 2023120498. https://doi.org/10.20944/preprints202312.0498.v1
Wu, H.; Tang, M.; Tong, P.; Hang, Y.; Zhao, J. Chemical Vapor Deposited 2D MoN Nanosheets as Stable and Uniform Surface Enhanced Raman Scattering Substrate with Thickness Dependent Sensitivity. Preprints 2023, 2023120498. https://doi.org/10.20944/preprints202312.0498.v1
Wu, H.; Tang, M.; Tong, P.; Hang, Y.; Zhao, J. Chemical Vapor Deposited 2D MoN Nanosheets as Stable and Uniform Surface Enhanced Raman Scattering Substrate with Thickness Dependent Sensitivity. Preprints2023, 2023120498. https://doi.org/10.20944/preprints202312.0498.v1
APA Style
Wu, H., Tang, M., Tong, P., Hang, Y., & Zhao, J. (2023). Chemical Vapor Deposited 2D MoN Nanosheets as Stable and Uniform Surface Enhanced Raman Scattering Substrate with Thickness Dependent Sensitivity. Preprints. https://doi.org/10.20944/preprints202312.0498.v1
Chicago/Turabian Style
Wu, H., Yang Hang and Junhua Zhao. 2023 "Chemical Vapor Deposited 2D MoN Nanosheets as Stable and Uniform Surface Enhanced Raman Scattering Substrate with Thickness Dependent Sensitivity" Preprints. https://doi.org/10.20944/preprints202312.0498.v1
Abstract
Two-dimensional (2D) materials show advantages as surface enhanced Raman scattering (SERS) substrate over traditional noble metals, such as chemically inert flat surface and uniform SERS signals. However, due to the low density of free electrons of 2D materials, the enhancement mechanism is mainly restricted to chemical enhancement instead of electromagnetic enhancement, resulting a relatively low enhancement factor. In this work, we reported a sensitive 2D SERS substrate based on chemical vapor deposited MoN nanosheets with electromagnetic enhanced mechanism. The maximum enhancement factor can be 3×105 with a limit of detected concentration of 4×10-8 M, which is comparable to those noble metal SERS substrates without hot spots. The MoN nanosheets show strong surface plasmon resonance in the visible range as evidenced by the UV-vis absorption spectroscopy and first principle calculation. The MoN nanosheets SERS substrates exhibit excellent Raman signal uniformity within the nanosheets. Meanwhile, Distinct thickness dependent sensitivity was observed in the MoN nanosheets, higher sensitivity can be achieved by decreasing the thickness of the nanosheets. Furthermore, the MoN nanosheets SERS substrate also show high thermal stability, which can be annealed in air for more than 300℃ and maintain its SERS activity. The high stability of MoN nanosheets allows it to be reused for 20 cycles without obvious signal decay. The high sensitivity, stability, reusability and Raman signal uniformity, makes MoN nanosheets an ideal 2D SERS substrate for practical applications.
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
