金纳米棒负载的静电纺丝纤维的制备及其表面增强拉曼光谱性能

为简单有效地制备高活性表面增强拉曼光谱(Surface-enhanced Raman Spectroscopy,SERS)基底。本文采用静电纺丝聚乙烯醇(PVA)/聚丙烯酸(PAA)纳米纤维为支撑材料,通过直接浸泡的方法,利用金纳米棒与电纺纤维之间的静电力,使纳米棒在纤维表面自组装,得到了性能优异的SERS基底。通过透射电子显微镜、扫描电子显微镜对金纳米棒以及不同状态下的电纺纤维的形貌进行表征,结果表明,金纳米棒均匀且密集地负载在纤维表面。通过设置不同的浸泡时间确定了金纳米棒组装平衡的时间为12 h,并通过调控纺丝时间和金纳米棒的浓度发现随着纺丝时间和金纳米棒浓度的增加,复合纤维膜SERS增强效果随之提升。该复合纤维膜具有优异的SERS均匀性,并且能够检测到浓度低至10~(-10)mol/L的4-氨基苯硫酚的存在。

Gold Nanorod-loaded Electrospun Fibers:Preparation and Surface-enhanced Raman Spectroscopy Performance

In this work, the highly active surface-enhanced Raman spectroscopy(SERS) substrate was fabricated by a simple and effective method. Electrospun polyvinyl alcohol(PVA)/polyacrylic acid(PAA) nanofibers were used as supporting material and a SERS substrate with excellent performance was obtained by a direct-immersed method due to the electrostatic force between gold nanorods and nanofibers. The morphologies of gold nanorods and electrospun fibers in different states were characterized by transmission electron microscopy and scanning electron microscopy. Gold nanorods are loaded uniformly and densely on the surface of fibers. The optimal assembly time of gold nanorods is 12 hours. By adjusting the spinning time and the concentration of gold nanorods, it was found that the SERS signal of the composite fiber membrane increased with the increase of the spinning time and the concentration of gold nanorods. The composite fiber membrane shows excellent SERS uniformity and the 4-aminothiophenol at a concentration of 10^-10 mol/L can be detected.