Chlorosulfonic Acid Stretched Carbon Nanotube Sheet for Flexible and Low-Voltage Heating Applications

Abstract

The carbon nanotube (CNT) is celebrated for its electrothermal property, which indicates the capability of a material to transform electrical energy into heat due to the Joule effect. The CNT nanostructure itself, as a one-dimensional material, limits the electron conduction path, thereby creating a unique heating phenomenon. In this work, we explore the possible correlation between CNT alignment in sheets and heating performance. The alignment of carbon nanotubes is induced by immersion and stretching in chlorosulfonic acid (CSA) solution. The developed CSA-stretched CNT sheet demonstrated excellent heating performance with a fast response rate of 6.5 °C/s and reached 180 °C in less than 30 s under a low voltage of 2.5 V. The heating profile of the stretched CNT sheet remained stable after bending and twisting movements, making it a suitable heating material for wearable devices, heatable smart windows, and in de-icing or defogging applications. The specific strength and specific conductance of the CSA-stretched CNT sheet also increased five- and two-fold, respectively, in comparison to the pristine CNT sheet.

Chlorosulfonic acid coated on porous organic polymer as a bifunctional catalyst for the one-pot three-component synthesis of 1,8-naphthyridines

“…3,4,[9][10][11] Today, there is increasing interest in the design and synthesis of heterogeneous supports containing high loads of sulfonic acid groups to increase the turnover number (TON) and turnover frequency (TOF) of the reaction. 12 Despite signicant advances in producing eco-friendly heterogeneous supports (such as cellulose, 13 silica, 14,15 carbon nanotubes, 16 iron aluminate spinel hercynite, 17 graphite carbon nitride, 18 magnetic nanoparticles, 4,5,7,[19][20][21] and polymers 22 ), it is necessary to set certain rules for their applications in terms of their synthesis, recycling, management, and cost.…”

Electrochemically Activated CNT Sheet as a Cathode for Zn-CO2 Batteries

“…The CNT sock (web of nanotubes) forms in the high-temperature synthesis zone of the reactor and is collected at the outlet of the reactor onto a rotating drum. A detailed description of the synthesis process tuning, process analysis, and characterization techniques can be found in our previously published research articles [ 39 , 40 , 41 , 42 , 43 , 43 , 44 , 45 , 46 ]. The as-synthesized CNT sheet materials are cleaned and expanded through an acid treatment and activation process.…”

Manufacturing and Characterization of Customizable Flexible Carbon Nanotube Fabrics for Smart Wearable Applications

“…The multi-sensors are very important to monitor safe operation of the reactor. Further details about our synthesis process can be found in our previous work [27][28][29][30][31][32].…”