Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China.
J Colloid Interface Sci. 2012 Sep 15;382(1):28-35. doi: 10.1016/j.jcis.2012.05.048. Epub 2012 Jun 7.
Surface-enhanced Raman scattering (SERS)-active substrates of polyvinyl alcohol/gold-silver (PVA/Au-Ag) nanofibers were prepared using a simple approach involving electrospinning. The tunable surface plasmon resonance (SPR) of gold-silver alloy (Au-Ag alloy) nanoparticles (NPs) was achieved by controlling the feed ratio between gold and silver precursors. A higher concentration of Au-Ag alloy NPs could be obtained than the conventional methods, using 1wt% of PVA as the stabilizer. The Au-Ag alloy structure was demonstrated by HRTEM and STEM-EDX. After the electrospinning, the Au-Ag alloy NPs were successfully embedded in PVA nanofibers, as shown in the SEM and TEM images. Raman spectra displayed an apparent enhancement in the signal of 4-mercaptobenzoic acid (4-MBA), pyridine, and thiophenol molecules pre-absorbed from their ethanol solution onto the PVA/Au-Ag nanofibers. Different SERS effects were achieved by varying the Au content or excitation wavelength.
采用简单的静电纺丝方法制备了聚乙烯醇/金银（PVA/Au-Ag）纳米纤维的表面增强拉曼散射（SERS）活性基底。通过控制金和银前体之间的进料比，可以实现金银合金（Au-Ag 合金）纳米粒子（NPs）的可调表面等离子体共振（SPR）。使用 1wt%的 PVA 作为稳定剂，可以获得比传统方法更高浓度的 Au-Ag 合金 NPs。HRTEM 和 STEM-EDX 证明了 Au-Ag 合金结构。静电纺丝后，Au-Ag 合金 NPs 成功嵌入 PVA 纳米纤维中，SEM 和 TEM 图像显示。拉曼光谱显示，从其乙醇溶液中预吸附到 PVA/Au-Ag 纳米纤维上的 4-巯基苯甲酸（4-MBA）、吡啶和噻吩分子的信号明显增强。通过改变 Au 含量或激发波长可以实现不同的 SERS 效应。
