접촉각 측정을 통한 면사 굵기별 Hydrophilicity 분석과 수분산 SWCNT 함침 Resistive Sensor 제작 및 성능 비교

Abstract

This study aims to determine a conductive fabric suitable for wearable smartdevices. The effect of the introduction of conductive particles on the fabric characteristicsbased on yarn thickness was compared and analyzed. The surface structure of cotton fabricsmade of 20 s, 30 s, and 40 s, was observed under a microscope at 400x magnification,and their contact angles were measured. To provide conductivity, the fabric was dipcoatedwith water-dispersed SWCNTs, and its average line and sheet resistance were measured. The ratio of the apparent area occupied by the yarn increased as the yarn becamethinner, and the contact angle were largest and smallest for Fabrics B and C, respectively. Accordingly, the surface properties were confirmed to be determined not only by the componentand thickness of the yarn, but also by the microstructure and energy of the fabricsurface and the size and spacing of irregularities. Upon measuring the resistance, Fabrics Band A were confirmed to have the highest and lowest resistance, respectively. Therefore,we propose a method of fabric selection by conducting such experiments before conductivefabric manufacturing.