Dry and Binder-Free Deposition of Single-Walled Carbon Nanotubes on Fabrics for Thermal Regulation and Electromagnetic Interference Shielding

Abstract

Conductive textiles with good flexibility and durability are highly demanded for wearable electronics. However, the common approaches of making conductive textiles require multi-step solvent processes, which is tedious and environment unfriendly. Herein, the high-quality single-walled carbon nanotubes (SWCNTs), synthesized by the floating catalyst chemical vapor deposition method, were directed and dry coated on the melt-blown fabrics (MBFs) recycled from the waste masks with binder-free chemical. The obtained MBF/SWCNT composites displayed excellent conductivity and flexibility and thus can be further used as wearable and heatable textiles. The sheet resistance of MBF/SWCNT composites can be further reduced by gold chloride (AuCl3) doping from 57 to 26 Ω/sq. The electrical–thermal measurement showed that the pristine MBF/SWCNT composites can reach the surface temperature of ∼48 °C at a low voltage (5 V), whereas it increased to ∼110 °C after AuCl3 doping at the same voltage. In addition, the AuCl3-doped MBF/SWCNT film with a thickness of ∼150 μm displays a high electromagnetic interference shielding efficiency of 27.1 dB at the X-band. Also, the MBF/SWCNT composites displayed good stability after long-term heating, bending, and washing. Our multi-functional MBF/SWCNT textiles not only demonstrated the reusability of waste masks but also showed great potential applications in electromagnetic interference and heat management, such as thermotherapy pads and fast water evaporators.

Bacterial-Cellulose-Reinforced Graphite Nanoplate Films for Electromagnetic Interference Shielding, Heat Conduction, and Joule Heating

“…The EMI shielding property of a material strongly depends on its electrical conductivity. , As shown in Figure a, pure GNP film exhibited the highest average EMI SE T of 46.6 dB because of its best electrical conductivity. The average EMI SE T of the 10%BC, 20%BC, 30%BC, 40%BC, and 50%BC was 43.0, 36.4, 30.0, 23.6, and 18.3 dB, respectively.…”

Fabrication of Conductive Fabrics Based on SWCNTs, MWCNTs and Graphene and Their Applications: A Review

“…Recently [100], conductive and flexible melt-blown fabrics were coated with SWCNTs by chemical vapor deposition, where the melt-blown fabrics were recycled from face masks. The results showed that the sheet resistance of the conductive fabrics depended on the deposition time and was 245, 116, and 57 Ω/ for deposition times of 1 h, 2 h, and 3 h, respectively.…”

Flexibly stretchable acrylic resin elastomer films for efficient electromagnetic shielding and photothermal conversion

“…Therefore, in intelligent electronic devices with high strain capacity, mechanical stability, wave insulation and thermal tunability, modied conductive acrylic resin elastomers are the best choice currently. Since the shielding performance of composite materials mainly depends on the high aspect ratio, low density, etc., of the conductive ller, 23,38 the one-dimensional tubular structure of carbon nanotubes (CNTs) has become a popular choice, due to its ultrahigh tensile strength, high conductivity, and thermal conductivity, [39][40][41][42][43] as an ideal material for preparing exible stretchable electromagnetic shielding lms with heat collection function. This work combines single-walled carbon nanotubes (SWCNTs) with acrylic resin-based elastomers by spraying to obtain an electromagnetic shielding lm with high toughness and stretchability, which can be effectively controlled through applied areal strain variables.…”