摘要
Developing well-defined nanostructures with superior surface-enhanced Raman scattering （SERS） performance is a critical and highly desirable goal for the practical applications of SERS in sensing and analysis. Here, a SERS-active substrate was fabricated by decorating a MoS2 monolayer with Ag nanowire （NW） and nanoparticle （NP） structures, using a spin-coating method. Both experimental and theoretical results indicate that strong SERS signals of rhodamine 6G （R6G） molecules can be achieved at ＂hotspots＂ formed in the Ag NW-Ag NP-MoS2 hybrid structure, with an enhancement factor of 106. The SERS enhancement is found to be strongly polarization dependent. The fabricated SERS substrate also exhibits ultrasensitive detection capabilities with a detection limit of 10-11 M, as well as reliable reproducibility and good stability.
Developing well-defined nanostructures with superior surface-enhanced Raman scattering （SERS） performance is a critical and highly desirable goal for the practical applications of SERS in sensing and analysis. Here, a SERS-active substrate was fabricated by decorating a MoS2 monolayer with Ag nanowire （NW） and nanoparticle （NP） structures, using a spin-coating method. Both experimental and theoretical results indicate that strong SERS signals of rhodamine 6G （R6G） molecules can be achieved at ＂hotspots＂ formed in the Ag NW-Ag NP-MoS2 hybrid structure, with an enhancement factor of 106. The SERS enhancement is found to be strongly polarization dependent. The fabricated SERS substrate also exhibits ultrasensitive detection capabilities with a detection limit of 10-11 M, as well as reliable reproducibility and good stability.
基金
This work was supported by the National Natural Science Foundation of China （No. 11274,395）, the Program for Changjiang Scholars and Innovative Research Team in University （No. IRT13042） and the Open Fund of the Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications （Jinan University）.
