Hongyan Yu,Yongxue Chen,Zhenyu Wen,Rensheng Wang,Sisi Jia,Wenjie Zhu,Yanping Song,Huanhuan Sun,Bingbing Liu
Pressure-induced surface-enhanced Raman spectroscopy (PI-SERS) has garnered significant attention as a subfield of SERS detection due to its capacity to regulate the band gap between molecules and substrates through pressure modulation. Currently, SERS detection primarily focuses on single molecules at atmospheric pressure with limited investigations conducted under high pressure conditions. Herein, we employed rose-shaped MoS2 nanoflowers as the SERS substrate and realized selective PI-SERS enhancement of R6G molecules in the binary (MV+R6G) and ternary (MV+R6G+RhB) systems. The MoS2 demonstrated an exceptionally low SERS detection limit of 5 × 10–6 M in binary and ternary systems with equimolar amounts of molecules. High-pressure experimental results indicate that MoS2 displays selective enhancement for R6G molecules, as evidenced by the comparison of the PI-SERS peak intensity ratio between MoS2 and the probe molecules. The proposed enhancement mechanism in binary and ternary SERS systems under high pressure involves pressure-induced changes in both the band structures of the MoS2 substrate and molecules, thereby influencing their charge transfer dynamics. Consequently, this approach holds great promise for practical applications in complex SERS systems operating under extreme conditions.
Shaoxiong Qin,Zixiu Li,Yang Zhang,Jiaqi Pan,Jun Cao,Chaorong Li,Jingjing Wang
The sensitivity and stability of SERS substrates are critical in surface-enhanced Raman scattering (SERS) spectral applications. The present study describes the synthesis of Cu 2 O nanoparticles using a facile chemical method. It was observed that both glucose and NaBH 4 , employed as reducing agents, exerted significant influence on the particle size. Notably, NaBH 4 exhibited enhanced efficacy in producing nanoscale particles. Furthermore, the structural characteristics of the sample were significantly influenced by the concentration of the reducing agent NaBH 4 ; an excessive concentration resulted in the emergence of metal copper. The Cu 2 O nanoparticles, obtained through a suitable reduction process using NaBH 4 , exhibited significant SERS activity, indicating a strong chemical interaction between Cu 2 O and rhodamine 6G (R6G) molecules. The N-doped Cu 2 O nanoparticles with varying proportions were synthesized. Raman spectra analysis revealed that the 2%N–Cu 2 O nanoparticles exhibited the most significant enhancement effect. These findings suggest that doping represents an effective approach to enhance the SERS activity of semiconductor substrates. In addition, in-situ reduction reaction was employed to synthesize Cu 2 O/Ag composite nanoparticles, which exhibited outstanding SERS activity and enabled the detection of 10 −9 M R6G. The observed enhancement is mainly attributed to the synergistic effects arising from the electromagnetic enhancement provided by Ag nanoparticles and the chemical enhancement offered by Cu 2 O. This research provides a simple and cost-effective method for preparing Cu 2 O-based SERS substrates with excellent performance, offering valuable insights and approaches for enhancing SERS performance in the future.
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