Phase Transformation on Two-Dimensional MoTe<sub>2</sub> Films for Surface-Enhanced Raman Spectroscopy
Two-dimensional (2D) transition metal dichalcogenides (TMDs) have recently become attractive candidate substrates for surface-enhanced Raman spectroscopy (SERS) owing to their atomically flat surfaces and adjustable electronic properties. Herein, large-scale 2D 1T′- and 2H-MoTe<sub>2</sub&g...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-11-01
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| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/29/21/5216 |
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| Summary: | Two-dimensional (2D) transition metal dichalcogenides (TMDs) have recently become attractive candidate substrates for surface-enhanced Raman spectroscopy (SERS) owing to their atomically flat surfaces and adjustable electronic properties. Herein, large-scale 2D 1T′- and 2H-MoTe<sub>2</sub> films were prepared using a chemical vapor deposition method. We found that phase structure plays an important role in the enhancement of the SERS performances of MoTe<sub>2</sub> films. 1T′-MoTe<sub>2</sub> films showed a strong SERS effect with a detection limit of 1 × 10<sup>−9</sup> M for the R6G molecule, which is one order of magnitude lower than that of 2H-MoTe<sub>2</sub> films. We demonstrated that the SERS sensitivity of MoTe<sub>2</sub> films is derived from the efficient photoinduced charge transfer process between MoTe<sub>2</sub> and adsorbed molecules. Moreover, a prohibited fish drug could be detected by using 1T′-MoTe<sub>2</sub> films as SERS substrates. Our study paves the way to the development and application of high-performance SERS substrates based on TMD phase engineering. |
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| ISSN: | 1420-3049 |