Air Driven Electrospinning of CNT Doped Conductive Polymer Fibers for Electronics
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.337
Air Driven Electrospinning of CNT Doped Conductive Polymer Fibers for Electronics Emily A. Kooistra-Manning1,2, Lane G. Huston1,2, Jack L. Skinner1,2, and Jessica M. Andriolo1,2 1
Montana Tech Nanotechnology Laboratory, 1300 W. Park St., Butte, MT, 59701, U.S.A.
2
Mechanical Engineering Department, Montana Technological University, 1300 W. Park St., Butte, MT, 59701, U.S.A.
Abstract
An electrostatic and air driven (EStAD) electrospinning device was used to achieve deposition of polymer fiber mats that carry electrical charge. The EStAD device does not require the polymer stream to contact a deposition electrode, thereby allowing enhanced control and processing versatility over production of conductive polymer materials. Direct current (DC) conductivity in the fiber mats was enabled through the use of a composite multi-walled carbon nanotube-polyethylene oxide (MWCNT-PEO) blend for electrospinning (ES). The electrospun fiber mats contained three different concentrations of MWCNTs. Conductivity and resistance were measured for each concentration as an electrospun fiber mat and compared to that of a drop-cast thin film. Results showed that at 7.51 wt% MWCNTs, conductivity in the electrospun fiber mats began to approach that of the drop-cast thin films at 1.76E-01 S/cm. At the lowest weight percent tested (3.37 wt%), conductivity was still measurable at approximately 8.48E-05 S/cm and was comparable to results reported previously using traditional ES methods.
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INTRODUCTION: Electrospinning (ES) is a rapid and efficient manufacturing process for producing polymer materials with high surface-area-to-volume ratios. Traditional ES fabrication involves an electrostatic force that pulls polymer from a grounded spinneret tip to a charged metallic deposition surface held at high voltage. Due to the high voltages and the charged electrodes required for ES fiber creation, ES of conductive polymer materials is challenging in traditional ES. During ES of conductive materials, a dielectric breakdown is more likely to occur between the spinneret and the deposition substrate, resulting in electrical arcing and non-predictable deposition. In the work presented here, a handheld ES device that incorporates directed airflow to guide the polymer stream through the electric field was used to create fiber mats. In the electrostatic and air driven (EStAD) ES device, air flow guides the conductive polymer stream from the spinneret tip through the center of a conductive ring electrode, and onto any substrate outside of the device [1]. In the EStAD system, lack of contact between the conductive polymer stream and the second electrode prevents electrical arcing, thereby improving predictability of material quality and allowing for
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