posted on 2024-03-16, 15:13authored byJiaming Chen, Lingjun Cheng, Yuanyuan Yang, Yating Liu, Canping Su, Yinghao He, Mingming You, Zhenyu Lin, Guolin Hong
Surface-enhanced Raman scattering (SERS) has great potential
in
biological analysis due to its specificity, sensitivity, and non-invasive
nature. However, effectively extracting Raman information and avoiding
spectral overlapping from biological background interference remain
major challenges. In this study, we developed a background-free SERS
nanosensor consisting of gold nanobipyramids (Au NBPs) core-Prussian
blue (PB) shell (Au NBPs@PB), for endogenous H2S detection.
The PB shell degraded quickly upon contact with endogenous H2S, generating a unique Raman signal response in the Raman silent
region (1800–2800 cm–1). By taking advantage
of the high SERS-activity of Au NBPs and H2S-triggered
spectral changes of PB, these SERS nanosensors effectively minimize
potential biological interferences. The nanosensor exhibits a detection
range of 2.0 μM to 250 μM and a limit of detection (LOD)
of 0.34 μM, with good reproducibility and minimal interference.
We successfully applied this background-free SERS platform to monitor
endogenous H2S concentrations in human serum samples with
satisfied results.