SWNT Coated PET Fabric Heaters with Stable Electrothermal Response from CMC/SWNT Conductive Network
Vol. 58, No. 5, pp. 267-273,
Oct. 2021
10.12772/TSE.2021.58.267
PDF
Abstract
Single-walled carbon nanotubes (SWNTs) are effectively dispersed in a water
medium using carboxymethyl cellulose (CMC) as a dispersant and coated onto polyethylene
terephthalate (PET) fabric via a dip-coating process. According to the weight percent
of the CMC to carbon nanotubes (CNTs), the coating evenness on the PET fabric surface,
dispersibility, and the washing fastness of the SWNT dispersant were changed and evaluated
using ultraviolet-visible (UV-Vis) spectrometry. At the optimized ratio between the
CMC and SWNT, the coated PET fabric exhibited higher electrical conductivity with a more
uniform resistance deviation value and a stable heating aspect in the infrared (IR) image,
compared with the bare SWNT-coated fabric. A specific observation of the coated fabric
surface revealed that the CMC/SWNT network formed on the fabric surface connects each
fibril by adding a parallel conductive pathway for the applied electrical flow. In addition,
this additive pathway can release the heat concentration, which grants the fabric heater
heat stability. The proposed fabric heater shows stable performance during the bending
test. After 1 hour of performing the ON/OFF test, 11.9 oC/s of the heating rate shows no
changes in the surface temperature. This study demonstrates a highly stable fabric heater
for heating sheets and wearable heating garments.
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