Preparation, Characterization And Application Of Noble Metal Nanoparticles Composited Electrospinning Fiber Materials

In recent years, electrospinnning technique has attracted great research interestbecause it can prepare various fiber materials in high efficiency and flexibility.Electrospinning sets up a magical bridge from liquids to solid fibers. Nowadays,electrospun fiber materials have been widely used in energy storage, healthcare,biotechnology, environment engineering, antibacterial materials and other fields. Inthis paper, we prepared luminescent silver nanoclusters composite fiber materials andnoble metal nanoparticles (NPs) doped fiber membrane for Surface-enhanced RamanScattering (SERS) substrates by electrospinning technique. Silver nanoclusters arewidely used in biochemical sensors, fluorescence imaging and antibacterial agentsdue to their special properties. The prepared SERS substrates have high sensitivity,which can be a promising commercial SERS substrate. The main contents of thispaper are as follows:1. PMMA-PMAA polymer fibers were prepared by electrospinning technique, whichwas used as a template for in situ synthesis of Ag nanoclusters via aphotochemical reaction. The prepared composite polymer fibers emit pinkluminescence and the luminescence property was optimized by pH and Ag(I)precursor concentration. The as-prepared Ag NCs in electrospun polymer fiberswere mainly Ag2-5. The intensity of fluorescence was the highest under theexcitation wavelength at490nm and the emission peak appeared at590nm.Furthermore, these luminescence composite polymer fibers showed strong antibacterial activity.2. Several kinds of Ag nanoclusters materials were prepared by different methods,which were used as antibacterial agents. Then, inhibition zone method and platecount method were used to test the antibacterial properties of Ag nanoclusters.These antibacterial agent containing Ag nanoclusters exist in solid and solutionphases, as well as nature silk composite Ag nanoclusters. The above antibacterialagent have a promising potential commercial use. In addition, we simply studiedthe antibacterial mechanism of Ag nanoclusters.3. We employed the electrospinning method to prepare metal NPs doped polymernanofiber mats, which can be easily cut into a proper size and fixed on slides ormicrofluid channels to work for surface-enhanced Raman scattering (SERS)measurements. Metal NPs embedded in the composite nanofibers maintained theirintrinsic shape and monodispersity, as well as enhancement ability. In addition,they can be re-suspended into aqueous solution to recover a colloidal solution withpersistent SERS activity. The SERS chips made by the metal NPs doped polymernanofiber mats displayed high detection sensitivity and reproducibility. Themicrofluid chips decorated by several metal NPs doped polymer nanofiber matspossess multi-SPR properties and can be widely optional for different analytes.These composite polymer mats facilitate storage and transportation, which alsopossess possible practicality as antibacterial filter and paint for medical purposes.