카본나노튜브/폴리에스터 유연 발열 직물의 제조와 나노 규모의 전도성 망이 발열 특성에 미치는 영향 연구

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.