Multifunctional\nDirectional Water Transport Fabrics with Moisture Sensing Capability

Abstract

Previous\nfabrics with directional fluid transport capability typically have\na single function to transport liquid. Multifunctional directional\nfluid fabrics are highly desirable for making “smart”\ntextiles but remain a challenge to develop. In this study, we have\nfor the first time prepared a multifunctional, directional water transport\nfabric. By using a two-step coating process, we applied polypyrrole\n(PPy), a conducting polymer, on one side of a hydrophilic fabric (cotton).\nWe showed that the single-side PPy-coated fabrics had reasonable conductivity\n(surface resistance in the range of 43–54 kΩ/□)\nand a one-way water transport function. We further showed that by\nintegrating metal-plated nylon wires on the two sides, the fabric\ncan be used as a capacitive sensor to sense water content in the fabric.\nThe conducting layer enables the sensor device to have a sufficient\ncapacitance response. Reasonable integration of the metal electrodes\nallows the device to have a minimal effect on the directional water\ntransport and breathability of the fabric. Such a novel multifunctional\nfabric may find applications in making “smart” clothing.