Unraveling the Raman Enhancement Mechanism on 1T′‐Phase ReS2 Nanosheets |
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| Authors: | Peng Miao Jing‐Kai Qin Yunfeng Shen Huimin Su Junfeng Dai Bo Song Yunchen Du Mengtao Sun Wei Zhang Hsing‐Lin Wang Cheng‐Yan Xu Ping Xu |
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| Affiliation: | 1. MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, China;3. Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, China;4. Academy of Fundamental and Interdisciplinary Sciences, Department of Physics, Harbin Institute of Technology, Harbin, China;5. Beijing Key Laboratory for Magneto‐Photoelectrical Composite and Interface Science, Center for Green Innovation, School of Mathematics and Physics, University of Science and Technology, Beijing, China;6. Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China |
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| Abstract: | 2D transition metal dichalcogenides materials are explored as potential surface‐enhanced Raman spectroscopy substrates. Herein, a systematic study of the Raman enhancement mechanism on distorted 1T (1T′) rhenium disulfide (ReS2) nanosheets is demonstrated. Combined Raman and photoluminescence studies with the introduction of an Al2O3 dielectric layer unambiguously reveal that Raman enhancement on ReS2 materials is from a charge transfer process rather than from an energy transfer process, and Raman enhancement is inversely proportional while the photoluminescence quenching effect is proportional to the layer number (thickness) of ReS2 nanosheets. On monolayer ReS2 film, a strong resonance‐enhanced Raman scattering effect dependent on the laser excitation energy is detected, and a detection limit as low as 10?9m can be reached from the studied dye molecules such as rhodamine 6G and methylene blue. Such a high enhancement factor achieved through enhanced charge interaction between target molecule and substrate suggests that with careful consideration of the layer‐number‐dependent feature and excitation‐energy‐related resonance effect, ReS2 is a promising Raman enhancement platform for sensing applications. |
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| Keywords: | 2D materials charge transfer photoluminescence quenching ReS2 surface‐enhanced Raman spectroscopy |
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