Journal of Nanomedicine & Nanotechnology

Fabrication and characterization of continuous silver nanofiber/polyvinylpyrrolidone (AgNF/PVP) coreâ??shell nanofibers using the coaxial electro-spinning process

19^th International Conference on Nanotechnology and Expo

November 13-14, 2017 | Atlanta, USA

Molla Bahiru Gebeyehu, Yu-Hao Chang, Angaw Kelemework Abay, Shao-Yen Chang, Jiunn-Yih Lee, Chang-Mou Wu, Tai-Chin Chiang and Ri-Ichi Murakami

National Taiwan University of Science and Technology, China

Scientific Tracks Abstracts: J Nanomed Nanotechnol

Abstract:

In the present study, continuous and uniform coreâ??shell silver nanofiber/poly(vinyl) pyrrolidone (AgNF/PVP) nanofibers have been successfully fabricated via an efficient coaxial-spinneret electrospinning method with a vertical configuration using PVP and AgNO3 as precursor solutions. PVP polymer was primarily used as a guide and provided an appropriate viscoelastic property by surrounding the AgNO3 (core) solution to fabricate aligned AgNF/PVP coreâ??shell nanofibers. A series of AgNO3 concentrations were prepared by fixing the concentration of PVP as the shell fluid. The AgNO3 concentration had a significant influence on the formation of the continuous and uniform AgNF/PVP coreâ??shell nanofiber structure and applied voltage had an effect on the formation of the compound stable Taylor cone. The (AgNF/PVP) coreâ??shell nanofibers were formed via the stretching of the co-electrospinning jet and the reduction temperature for an appropriate time induced the silver nanofiber to be well aligned along the axis of the PVP-template electrospun fiber. The structure and properties of the thus obtained coreâ??shell nanofibers were investigated thoroughly through optical microscopy (OM), transmission electron microscopy (TEM), focused ion beam (FIB), X-ray diffraction (XRD) and selected area electron diffraction (SAED). Energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) were also employed to analyze the elemental composition of the coreâ??shell nanofiber surface. On the other hand, UV-vis spectrophotometry was used to test the reduction of silver ions into metal silver. Moreover, electrical measurements were performed on the (AgNF/PVP) coreâ??shell nanofibers, which indicated that the coreâ??shell nanofibers became insulating due to the embedded highly conductive silver nanofibers by insulating the PVP shell. Therefore, coaxial electrospinning is a convenient and cost effective process for the fabrication of continuous and uniform (metal/polymer) coreâ??shell nanostructure fibers.

Biography :

Molla Bahiru Gebeyehu has completed his PhD from National Taiwan University of Science and Technology, in Materials Science and Engineering. Currently, he is the Teacher and Researcher in University of Gondar, Ethiopia. He has published four papers in reputed journals.