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Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/282

Title: Nanofibers and nanocomposites of poly(3,4-ethylene dioxythiophene)/poly(styrene sulfonate) by electrospinning
Authors: El-Aufy, Afaf Khamis
Keywords: Materials engineering;Nanostructured materials – Electric properties;Organic conductors
Issue Date: 12-Apr-2004
Abstract: Intrinsically conductive polymers such as PEDT are an important class of electroactive polymer being used in the form of films for electronic devices such as LED. In order to explore the feasibility of PEDT for wearable electronics, PEDT/PAN blend was converted to fibers and fibrous assemblies. Specifically PEDT polymer blends and their composites were converted to submicron and nanoscale fibers to explore the nanoscale effect on the conductivity of PEDT. In order to organize the nanofibers to aligned and planar assemblies, various processing mechanisms were developed including “Dry Rotary Electrospinning” and “Self-assembled” yarn formation as well as non-woven random fiber mats. In order to optimize the electrospinning process, the fiber diameters of the PEDT fiber were correlated with polymer concentration. The PEDT nanofibrous assemblies were characterized by Four-point probe electrical conductivity measurement and by microtensile testing. Confirming the significant effect of fiber diameter on electrical conductivity, a four-fold increase in electrical conductivity was observed as fiber diameter decrease from 260nm to 140nm. To further explore advanced material concepts to introduce multiple functions to the electrospun yarn, single walled carbon nanotubes (SWNTs), were successfully co-electrospun with PEDT/PAN blend. The inclusion of SWNTs shows further increase in electrical conductivity of nanofibrous yarn and the tensile strength increased by 50%.The Presence of SWNTs were confirmed by Raman spectroscopy and HREM which also show good alignments of CNTs within the nanofibers. The carbon nanotubes reinforced PEDT nanofibrous yarn was woven into a fabric to demonstrate the feasibility of the electrospun yarn as an attractive enabling material for wearable electronics.
URI: http://dspace.library.drexel.edu/handle/1860/282
Appears in Collections:Drexel Theses and Dissertations

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