The Ag/PPy@PEDOT:PSS film was used as a Surface-enhanced Raman scattering (SERs) substrate to directly detect the low concentration of sodium formaldehyde sulfoxylate (SFDS) molecules in solution. We prepared the PPy@PEDOT:PSS film by electrochemical potentiostatic (ECP) method and then directly grew Ag nanoparticles on its surface to prepare the SERs substrate of Ag/PPy@PEDOT:PSS film. The results showed that with the increase of depositional time of Ag nanoparticles, accordingly, the size and density of Ag nanoparticles could be increased on the film surface, and their SERs effect was also enhanced gradually; this SERs substrate could sensitively detect the SFDS molecules in aqueous solution. Moreover, the minimum detection limit was up to 1 ng/mL. This preparing and detecting method of SERs substrates provides a new way for the preparation of high sensitivity SERs substrate and for direct and rapid detection of low concentration of SFDS molecules in food and drug.

将Ag / PPy @ PEDOT：PSS膜用作表面增强拉曼散射（SERs）衬底，以直接检测溶液中低浓度的甲醛次硫酸氢钠（SFDS）分子。我们通过电化学恒电位（ECP）方法制备了PPy @ PEDOT：PSS膜，然后在其表面直接生长Ag纳米颗粒，从而制备了Ag / PPy @ PEDOT：PSS膜的SERs衬底。结果表明，随着银纳米颗粒沉积时间的增加，银纳米颗粒的尺寸和密度可以在膜表面增大，其SER作用也逐渐增强。该SERs底物可以灵敏地检测水溶液中的SFDS分子。此外，最低检测限高达1 ng / mL。