Electromagnetic Interference Shielding and Electrothermal Performance of MXene‐Coated Cellulose Hybrid Papers and Fabrics Manufactured by a Facile Scalable Dip‐Dry Coating Process

Abstract

Herein, the electromagnetic interference (EMI) shielding and electrothermal properties of MXene‐coated cellulose hybrid papers (MCPs) and fabrics (MCFs) with high flexibility and low density, which are manufactured by a dip‐dry coating approach, are reported. For this purpose, MCPs and MCFs are fabricated by dipping cellulose papers and fabrics repeatedly into an aqueous dispersion of MXene. The electron microscopic and X‐ray diffraction data reveal that MXene sheets are coated uniformly on the surfaces of cellulose fibrils and fibers and that their contents increase with the dip‐dry coating cycle. For MCP10 (5.68 wt% MXene) and MCF10 (11.77 wt% MXene), which are manufactured by ten‐time dip‐dry coating cycles, high electrical conductivity of 1.91 and 0.08 S cm−1 are attained, respectively. In addition, MCP10 and MCF10 possess excellent absolute EMI shielding effectiveness (SSEt) of 2198 and 1100 dB cm2 g−1 at 8 GHz, respectively, which is due to the multiple internal reflection and absorption of incident EM waves by conductive and interconnected MXene‐coated cellulose fibrils and fibers. It is also found that MCP1 (0.9 wt% MXene) and MCF1 (1.9 wt% MXene) at one‐time dip‐dry coating cycle show outstanding electrothermal performance in aspects of high saturated temperatures and energy conversion efficiency at low applied voltages.

Research Progress on the Preparation of Flexible and Green Cellulose-Based Electrothermal Composites for Joule Heating Applications

“…(b, c) Current–voltage curves, (d, e) infrared images and time–temperature curves obtained for MCP and MCF. (Panels a–e) Reprinted with permission from ref . Copyright 2021 John Wiley and Sons.…”

“…Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) showed that the contact of the conductive fillers was limited due to the higher porosity and bulky structure of the cotton fabric. As a result, continuous conductive channels were not formed in sufficient amounts in the cotton fabric . RGO and conductive polymers were synergistically applied by dip-dry coating to enhance the electrothermal properties of the cotton fabrics.…”

Advanced Fiber Materials for Wearable Electronics

“…Therefore, the addition of a protective layer outside the conductive layer or the insertion of certain adhesives as the middle layer is usually required during the coating. Coating technique mainly include dip coating [75], spraying [76], screen printing [77], vacuum filtration [78] and electroless deposition (ELD) [79].…”

Hybrid Carbon Nanofibers Derived from MXene Nanosheets and Aromatic Poly(ether amide) for Self‐Standing Electrochemical Energy Storage Materials

“…[43] MXene (Ti 3 C 2 T x ) was manufactured from MAX (Ti 3 AlC 2 ) powder through a layer delamination method. [31,44] For preparing a mild etching solution, 3.2 g of LiF powder was dissolved in 40 mL of 9 m HCl solution. 2 g of MAX powder was then added slowly to the etching solution at 35 °C, which was stirred for 24 h to remove the Al layer from MAX phase.…”

“…The fabricated MXene sheets were analyzed to have a plane diameter of 20 ± 10 μm and elemental compositions of 35.7 at% Ti, 28.7 at% O, and 20.3 at% F, and 3.48 at% Cl, and 0.78 at% Al, as reported in the previous study. [44] A series of MXene/PEA-derived HCNFs were manufactured through electrospinning, dip-coating, and carbonization, as schematically represented in Figure 1. For electrospinning of the first step, 16 wt% PEA/PVP dope solution was prepared by dissolving PEA and PVP (70/30 by wt%) in DMF solvent and stirring magnetically at 30 °C for 24 h. The uniformly stirred solution was injected into a 20 mL syringe with an inner diameter of 21 G and then spun into nanofibers under the conditions of an applied voltage of 15 kV, a constant distance of 15 cm between the syringe tip and the collector, and a feed rate of 0.5 mL h −1 .…”