Electrical resistance measurement methods and electrical characterization of poly(3,4‐ethylenedioxythiophene)‐coated conductive fibers

Abstract

Textile fibers and yarns of high conductivity, and their integration into wearable textiles for different electronic applications, have become an important research field for many research groups throughout the world. We have produced novel electrically conductive textile yarns by vapor‐phase polymerization (VPP) of a conjugated polymer, poly(3,4‐ethylenedioxythiophene) (PEDOT), on the surface of commercially available textile yarns (viscose). In this article, we have presented a novel setup for electrical resistance measurements, which can be used not only for fibrous structures but also for woven structures of specific dimensions. We have reported a two‐point resistance‐measuring method using an already manufactured setup and also a comparison with the conventionally used method (so‐called crocodile clip method). We found that the electrical properties of PEDOT‐coated viscose fibers strongly depend on the concentration of oxidant (FeCl3) and the doping (oxidation) process of PEDOT. To evaluate the results, we used mass specific resistance values of PEDOT‐coated viscose yarns instead of normal surface resistance values. The voltage–current (V–I) characteristics support the ohmic behavior of coated fibers to some extent. Monitoring of the charging effect of the flow of current through conductive fibers for prolonged periods of time showed that conductivity remains constant. The change in electrical resistance values with increase in the length of coated fibers was also reported. The resistance‐measuring setup employed could also be used for continuous measurement of resistance in the production of conductive fibers, as well as for four‐point resistance measurement. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

High‐strength electrically conductive fibers: Functionalization of polyamide, aramid, and polyester fibers with PEDOT polymer

“…Electrical properties of PEDOT‐coated fibers were determined by Keithley 6000 picoammeter. For this purpose, 2‐probe method was used along with self‐made fiber holding setup, which has been discussed in our previous work . The electrical resistance was measured along 150‐mm‐long PEDOT‐coated fibers when voltage was varied from 1 to 10 V and then plotted the voltage‐current (V‐I) curve to see their electrical behavior.…”

“…For this purpose, 2-probe method was used along with self-made fiber holding setup, which has been discussed in our previous work. 33 The electrical resistance was measured along 150-mm-long PEDOT-coated fibers when voltage was varied from 1 to 10 V and then plotted the voltage-current (V-I) curve to see their electrical behavior. It can be seen in Figure 5 that the maximum current density is observed for polyester (untwisted) fibers.…”

“…The scanning electron microscopy (SEM) was used to study the surface morphology of coated fibers. Electrical properties were measured by using 2‐probe method that was studied in our previous publication . Thermal and mechanical properties were investigated by thermogravimetric analysis (TGA) and tensile testing, respectively.…”

Quantitative characterisation of conductive fibers by capacitive coupling

“…An effort towards continuous fiber resistance monitoring of conductive fibers was developed by Bashir et al 12 In that work, fiber resistance was monitored by 2PP and 4PP, where brass pulleys acted as both sample holder and electrode. Although effective for monitoring conductive fibers, the method is impractical for enamelled or coaxial fibers, or measurements requiring a contactless approach.…”

Thermal-electrical properties and resistance stability of silver coated yarns

“…Excellent thermal stability of silver coated yarns was required as heating resistance element for the electrical heating clothing. [8,9] In order to detect the performance of silver plated yarn we choose three kind of silver coated yarns with we could obtained in the market. The electrical resistance was test by oven ageing and Infrared photograph instrument.…”