Multi-walled carbon nanotube-coated cotton fabric for possible energy storage devices

Abstract

A conducting cotton fabric with a resistance of <1.5 k cm −2 was obtained by dip coating of multiwalled carbon nanotubes (MWCNTs) dispersed in a surfactant, sodium dodecyl sulphate (SDS). The dip coating was repeated up to 20 times to increase the loading of MWCNT as observed from optical absorption spectra (λ max = 442 nm). The field emission scanning electron microscopy (FE-SEM) image of coated fabric at different magnifications shows micro-fibril structure. Energy-dispersive X-ray analysis (EDXA) spectra show peaks for carbon and other constituent elements of SDS, Na and S. In order to improve the functionality of loaded MWCNT, the coated fabric was treated with 5% HNO 3 for 3 h. For such a sample, the resistance decreased significantly to 1.5 k cm −2 , whereas it is 2.0 and 2.5 k cm −2 for untreated and KOH-treated sample. This is in corroboration with I−V characteristics, and is attributed to increased loading of MWCNT through hydrogen bonding with glycosidic group present in cotton (cellulose) fibres. The series capacitance of the MWCNT-coated fabric is about 40 μF cm −2 , which is found to decrease with the increase in frequency, close to zero at about 20 kHz. A capacitor formed by placing two MWCNT-coated fabrics between etched PCB plates (terminal contacts) shows the charging capacity of about 1 F.

Multiwalled-Carbon-Nanotubes (MWCNTs)–GPTMS/Tannic-Acid-Nanocomposite-Coated Cotton Fabric for Sustainable Antibacterial Properties and Electrical Conductivity

“…Due to the hydrophobic nature of MWCNTs and their aggregation in an aqueous solution, GPTMS was added to the modified MWCNT surfaces in order to enhance their hydrophilicity [31]. GPTMS was pre-hydrolyzed for the conversion of the alkyl oxygen groups (-OCH3) to hydroxyl groups (-OH) (equation (1) in Figure 1a). After its addition, stable hydrogen bonds were formed between hydroxyl groups covering the surface of the MWCNTs and hydroxyl groups of the hydrolyzed GPTMTs (equation (2) in Figure 1a).…”

“…Nanomaterials are used to design smart textiles for improving the properties of textiles such as wound healing, self-cleaning and military application [1][2][3][4]. Additionally, the utilization of nanomaterials is beneficial for the enhancement the physical characteristics of textiles in fields such as antibacterial-feature, water-repellence, soil-resistance, antistatic, anti-infrared, and fire-retardant characteristics [5][6][7][8].…”

Polymer/Nanocarbon Nanocomposite-Based Eco-friendly Textiles

“…Moreover, the Kevlar fibers can be modified to convert into the eco-friendly textiles. Similarly, the other polymers can be employed for the defense garments [69]. For highperformance textiles, the textile manufacturing industries need to incorporate the polymer/nanocarbon-based eco-friendly textiles.…”

Wearable supercapacitors based on graphene nanoplatelets/carbon nanotubes/polypyrrole composites on cotton yarns electrodes

“…An initial step (based on Refs. [35][36][37]) was considered for impurities removal and established as follows: cotton yarns were immersed in aqueous solution (10 mL) of triton X-100 (1 mL) and rinsed with Milli-Q water-the samples were dried in an oven (100 °C). Following this procedure, the cotton yarns were kept under sonication in alcohol, acetone and water for 15, 5 and 5 min, respectively-with the repetition of the last two steps.…”