Nitrite ions present a significant risk to both environmental and human health, necessitating precise and sensitive detection methods. Herein, we fabricated a highly sensitive SERS sensor based on PVDF/Au nanofibers for nitrite ion detection. The synthesis of PVDF nanofibers involved the utilization of electrospinning apparatus, while the uniformity and high density of SERS activity "hot spots" were achieved by directly coating plasma gold nanoparticles onto the PVDF surface adopting thermal evaporation. The efficient charge transfers of the interface dipole layer directly generated on the surface of PVDF nanofibers were achieved through thermal evaporation. The enhanced Raman responses owe to the combined effects of local surface plasmon resonance of Au nanoparticles and photoelectric and piezoelectric properties of PVDF. It is noteworthy that the prepared SERS substrate exhibited high sensitivity towards Rhodamine 6G, boasting an enhancement factor of 9.4 × 107 and a detecting scope spanning from 10-6  10-11 M. Furthermore, the PVDF/Au membrane functionalized with p-aminothiophenol (PATP) effectively captured NO2- ions at concentrations as low as 10-8 M and successfully detected NO2- in river water samples. Additionally, the SERS substrate has good repeatability and stability, and can be applied to trace detection in food detection and medical diagnosis.

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