Fabrication Of Conductive PVA/PEDOT:PSS/DMSO Nanofibers By Electrospinning

In this dissertation, we used polyvinyl alcohol (PVA) as the spinning matrix,poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate acid)(PEDOT:PSS) as blendingagents, dimethyl sulfoxide (DMSO) as a dopant increasing the PEDOT:PSSconductivity, tofabricate PVA/PEDOT:PSS/DMSO nanofibers. First, we studied the conductiveperformance and mechanism of PEDOT:PSS/DMSO; secondly, the conductivity,electrospinning properties, rheological properties and thermal properties of PVA andPVA/PEDOT:PSS/DMSO were studied; and finally, carbon nanotubes (MWNT) andacidified carbon nanotubes (MWNT-COOH) were doped into PVA/PEDOT:PSS/DMSO.DMSO as a secondary dopant dramatically increased the conductivity of PEDOT:PSSfilm. The presence of DMSO and PSS molecular chain interaction indirectly promptedPEDOT main chain structure of benzene-quinone transition, which performs the randomclew curls transforming into stretching curls, thereby reducd the carrier mobility barrier.AFM, SEM, Raman techniques proved benzene-quinone transition of PEDOT main chainstructure.PVA in the PEDOT:PSS films had a dual role, both as polyol to improve conductivityand as a dopant to insulate. The PVA concentration suitable for electrostatic spinning was6~9wt%, the process of which was stable, pinning continuous and uniform. Rheologicaland surface tension tests were performed to research the impacts of solution properties(viscosity, concentration) on the processing of electrostatic spinning.The concentration of PVA/PEDOT:PSS/DMSO suitable for electrostatic spinning was6~8wt%, and the diameter of fibers increased with the increase of the concentration ofPVA, but the spinning process is poor relatively. As polyol, PVA had the interaction withPSS (S... H-O intermolecular hydrogen bonding), and this effect was enhanced with PVAconcentration increased.The MWNT-COOH prepared via oxidation acidification for preliminary MWNT coulddisperse into the polymer system well. At the same time, because of the interaction between carboxyl and PEDOT:PSS, PVA/PEDOT:PSS/DMSO after the MWNT surfacefunctionalization, MWNT-COOH was advantageous to electrospinning and enhanced thethermal stability of systems.