Journal
SMALL
Volume 14, Issue 14, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201704079
Keywords
2D materials; charge transfer; photoluminescence quenching; ReS2; surface-enhanced Raman spectroscopy
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Funding
- National Natural Science Foundation of China [21471039, 21571043, 21671047, 11204184, 11604139, 61575196, 51772064]
- Fundamental Research Funds for the Central Universities [PIRS of HIT A201502, HIT BRETIII 201223]
- China Postdoctoral Science Foundation [2014M560253]
- Youth Innovation Promotion Association of CAS [2015316]
- Postdoctoral Scientific Research Fund of Heilongjiang Province [LBH-Q14062, LBH-Z14076]
- Natural Science Foundation of Heilongjiang Province [B2015001]
- Special Funds for the Development of Strategic Emerging Industries in Shenzhen [JCYJ20150630145302235]
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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(-9) M 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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