posted on 2024-03-15, 12:50authored byXiaoyu Tian, Bo Zhang, YanYan Li, Junsheng Yang, Liangbo Sun, Houchang Pei, Qiang Cao, Qianqian Lin
The
noble-metal-free surface-enhanced Raman scattering (SERS) substrates
have gained significant attention due to their abundant sources, signal
uniformity, biocompatibility, and chemical stability. However, the
lack of controllable synthesis and fabrication methods for high-SERS-activity
noble-metal-free substrates hinders their practical applications.
In this study, we demonstrate the use of a femtosecond laser direct
writing technique to precisely manipulate and modify microstructures,
resulting in enhanced SERS signals from Sb2S3 nonmetal-oxide semiconductor materials. Compared with unpatterned
Sb2S3 samples, the Sb2S3 microstructures exhibited up to a 16-fold increase in Raman scattering
intensity. Interestingly, our results indicate that the femtosecond
laser can induce a transformation in the crystalline state of Sb2S3 and significantly enhance the Raman spectrum
signal within the Sb2S3 microstructures. This
enhancement is also highly dependent on the period and depth of the
microstructures, possibly due to the cavity effects, resulting in
a stronger local field enhancement.