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Unraveling the Raman Enhancement Mechanism on 1T′‐Phase ReS 2 Nanosheets
Author(s) -
Miao Peng,
Qin JingKai,
Shen Yunfeng,
Su Huimin,
Dai Junfeng,
Song Bo,
Du Yunchen,
Sun Mengtao,
Zhang Wei,
Wang HsingLin,
Xu ChengYan,
Xu Ping
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201704079
Subject(s) - raman spectroscopy , materials science , raman scattering , photoluminescence , rhodamine 6g , monolayer , resonance (particle physics) , quenching (fluorescence) , analytical chemistry (journal) , optoelectronics , nanotechnology , molecule , optics , chemistry , fluorescence , physics , organic chemistry , particle physics , chromatography
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 (ReS 2 ) nanosheets is demonstrated. Combined Raman and photoluminescence studies with the introduction of an Al 2 O 3 dielectric layer unambiguously reveal that Raman enhancement on ReS 2 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 ReS 2 nanosheets. On monolayer ReS 2 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, ReS 2 is a promising Raman enhancement platform for sensing applications.