We studied a Surface-enhanced Raman scattering (SERs) film by self-assembled deposition of Ag nanoparticles on the surface of PPy@PEDOT:PSS films to detect melamine molecules. The PPy@PEDOT:PSS film was prepared using an electrochemical polymerization method in a mixture solution of PPy and PEDOT:PSS. Then, Ag nanoparticles were directly deposited on the surface of PPy@PEDOT:PSS films by a chemical self-assembly method as an active SERs substrate to detect melamine molecules. The results showed that the density of Ag nanoparticles on the surface of PPy@PEDOT:PSS film was gradually increased due to the increase of depositional time of Ag nanoparticles. Accordingly, The SERs effect was also substantially enhanced. The signal of melamine was increased up to 440 times. The melamine molecules at 6.4 ng/ml concentration could be clearly identified. This preparing method of SERs film and detecting method of melamine molecules provide a new strategy for the design and application of chemical sensors and bio-sensors.

中文翻译：

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Ag纳米粒子在PPy@PEDOT:PSS薄膜上自组装沉积以检测三聚氰胺分子

我们通过在 PPy@PEDOT:PSS 薄膜表面自组装沉积银纳米颗粒来研究表面增强拉曼散射 (SERs) 薄膜以检测三聚氰胺分子。PPy@PEDOT:PSS 薄膜是在 PPy 和 PEDOT:PSS 的混合溶液中使用电化学聚合方法制备的。然后，通过化学自组装方法将银纳米颗粒直接沉积在 PPy@PEDOT:PSS 薄膜的表面，作为活性 SERs 基底来检测三聚氰胺分子。结果表明，随着银纳米颗粒沉积时间的增加，PPy@PEDOT:PSS薄膜表面银纳米颗粒的密度逐渐增加。相应地，SERs 效应也得到显着增强。三聚氰胺的信号增加了440倍。可以清楚地识别出浓度为 6.4 ng/ml 的三聚氰胺分子。