Dielectric and morphological studies of nanostructured polypyrrole-coated cotton fabrics

Abstract

In this study, nanostructured polypyrrole (PPy)-coated cotton textiles were produced by in situ chemical oxidative polymerization and dielectric/electrical properties of PPy-coated cotton fabrics were presented in the low-and highfrequency regions. The conductive cotton fabrics showed a relatively high dielectric constant in the low-and radiofrequency region. The dielectric constant and dielectric loss for all fabrics presented relatively high values at low frequency and were found to decrease with the frequency. The influence of the PPy content and the type of dopant and oxidant on the morphological, dielectric/electrical and thermal properties of the cotton fabrics was investigated. It was found that the type of dopants and oxidants had a noticeable effect on the electrical/dielectric and morphological properties. The frequency dependence of AC conductivity, dielectric constant, dielectric loss and electric modulus were analyzed in the frequency range from 0.1 kHz to 10 MHz. The nanofiber network morphology of coated fabrics produced by dodecylbenzenesulfonic acid sodium salt improved the electrical/dielectric and thermal properties of cotton composites.

Effects of oxidant and dopants on the properties of cellulose/PPy conductive composite hydrogels

“…Therefore, the electrical conductivities of PPy is reduced because of the destroyed conjugate structure of PPy. 23,28 Therefore, the composite hydrogels with oxidant at appropriate concentrations exhibited the higher conductivities for the better packed structure of the hydrogel networks.…”

“…The morphology, conductivity and mechanical strength of PPy conductive composites are greatly dependent on the oxidant and the dopant. Many reports are concentrated on the effects of the oxidant and doping on the conductive composites such as film 20,21 and fiber 18,[22][23][24] ; however, there is limited knowledge on the hydrogels.…”

A novel flexible sensor for respiratory monitoring based on in situ polymerization of polypyrrole and polyurethane coating

“…where r H is hysteresis, DH max is the maximum D-value between loading and unloading of tension at the same elongation, and Y FS is the average of maximum output. Table 2 shows sensing properties of KCF-P, KCF-PPU1, KCF-PPU2 and KCF-PPU3 calculated by using the functions (9)- (11). The sensitivity of samples increases with increasing GSM of polyurethane coating.…”

The Effect of Dopant Type on The Morphology and Electrical Properties of Hollow Polyester Fabric

“…The methods usedin chemical polymerizationused to producePPy-conducting textilesare as follows: in situ polymerization,two-step polymerization, emulsionpolymerization and vapor phase polymerization.The synthesis of PPy on textile substrates is carriedout by ferric chloride (FeCl3) and ammonium persulfate(APS). Sulfonic acid-based dopants such as anthraquinonesulfonic acid (AQSA), dodecylbenzenesulfonicacid sodium salt (DBSA), ptoluene sulfonic acid(PTSA), naphthalenedisulfonic acid (NDSA), benzenesulfonic acid (BSA) and naphthalenesulfonic acid(NSA) are used [2].…”