1：Experimental Design and Method Selection:

The study involved the preparation of Ag NPs decorated polyimide (PI) nanofabric via an integrated process of electrospinning and ion exchange-in situ reduction. ATR-FTIR, ICP, XRD, SEM, and TGA were used to investigate the influencing factors during preparation.

2：Sample Selection and Data Sources:

p-Aminothiophenol (p-ATP) was used as the probe molecule to characterize the SERS performance of Ag@PI nanofabric substrate.

3：List of Experimental Equipment and Materials:

Materials included N, N’-dimethylformamide (DMF), pyromellitic dianhydride (PMDA), 4,4′-oxydianiline (ODA), glucose, seignette alkali, ascorbic acid, p-aminothiophenol (p-ATP), silver nitrate (AgNO3), and dimethylamine-borane (DMAB). Equipment included a field-emission scanning electron microscopy (FESEM, 7800F, JEOL, Japan), Nicolet Nexus670 IR spectrometer, Bruker AXS D8 ADVANCE X-ray diffractometer, inVia Reflex Raman spectrometer, TA Q50 TGA analyzer, and ICAP-6000 Inductively Coupled Plasma Emission Spectrometer.

4：Experimental Procedures and Operational Workflow:

The poly(amic acid) (PAA) solution was synthesized and electrospun into nanofiber nonwovens. The PAA nanofiber membrane was soaked into AgNO3 solution for Ag+ loading, then reduced into Ag NPs deposited on the PAA nanofiber. The process was repeated to increase Ag loading. After thermal treatment, the PAA was converted into PI, resulting in Ag NPs coated PI nanofabric.

5：Data Analysis Methods:

The SERS enhancement factor (EF) was calculated using a specific equation to estimate the enhancement effect.