Journal of Textile Research ›› 2023, Vol. 44 ›› Issue (11): 142-150.doi: 10.13475/j.fzxb.20220804501

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation and electromagnetic shielding performance of hollow magnetic Fe3O4 nanosphere/MXene composite cotton fabrics

ZHENG Xianhong1,2,3, TANG Jinhao2, LI Changlong2(), WANG Wei1,3   

  1. 1. College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China
    2. School of Textile and Garment, Anhui Polytechnic University, Wuhu, Anhui 241000, China
    3. Saintyear Holding Group Co., Ltd., Hangzhou, Zhejiang 311200, China
  • Received:2022-08-16 Revised:2022-12-14 Online:2023-11-15 Published:2023-12-25

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Abstract:

Objective Lightweight, flexible, air permeable and high-performance electromagnetic interference (EMI) shielding materials are urgently required to solve the increasingly serious electromagnetic radiation pollution. Transition metal carbides/nitrides (MXenes) have attracted much attention in the area of EMI shielding because of their high metallic electrical conductivity. However, the MXene modified fabrics usually exhibited reflection-dominant EMI shielding mechanism because of the impedance mismatch. Therefore, it is still a critical challenge to fabricate high-performance MXene-based EMI shielding fabrics with tunable EMI shielding performance and mechanism.

Method Constructing multilayer heterogeneous structure of hollow magnetic Fe3O4 nanospheres (HFOs)/MXene is an efficient approach to improve and tune the EMI shielding performance of the composite fabrics, because the HFOs and MXene can absorb the electromagnetic waves by means of the magnetic loss and conductive loss, respectively. More importantly, the electromagnetic waves will be attenuated in the multilayer heterogeneous structure due to the multiple reflections. However, the paper proposed relatively few studies devote to studying the EMI shielding performance of HFOs/MXene modified fabrics. Herein, the paper proposed a layer-by-layer assembly strategy to construct multilayer heterogeneous structure of hollow magnetic Fe3O4 nanospheres/MXene on the cotton woven fabrics to fabricate high-performance EMI shielding fabrics.

Results HFOs were prepared by hydrothermal method, which exhibited the hollow morphology (with a diameter of (271.9±4.6) nm) with the inverse spinel structure (Fig. 2). Fe3O4/MXene modified fabrics were fabricated by the layer-by-layer assembly. The cotton fabrics were firstly deposited with MXene nanosheets by the spray-coating method. The HFOs were positively charged by using the cetyltrimethylammonium bromide (CTAB), which were deposited on the MXene modified fabrics by the electrostatic attraction to fabricate the HFOs/MXene composite fabrics. The layer-by-layer assembly was repeated for 11 cycles to increase the loading of active materials. The HFOs and MXene were uniformly deposited on the fabrics and exhibited MXene-dominant structure (Fig. 4 and Fig. 5), which facilitated constructing complete electrically conductive networks in the composite fabrics. The sheet resistance of the composite fabric was decreased from (5 800±85) Ω/□ to (10.5±1.7) Ω/□ when the assembling cycle increased from 1 to 11 (Fig. 8), which was attributed to the increased MXene loading and the corresponding completed electrically conductive networks. In addition, the composite fabric demonstrated good air permeability (Fig. 9). The HFOs/MXene composite cotton fabrics also demonstrated good EMI shielding performances. The EMI shielding performance of the fabric was improved with the assembling cycles, and the maximum EMI shielding effectiveness was up to (29.03±0.3) dB (Fig. 10 and Fig. 11). The absorption EMI shielding effectiveness was higher than reflection EMI shielding effectiveness for all the composite fabrics. More importantly, the EMI shielding mechanism was tunable for the composite fabrics, and the EMI shielding mechanism changed from absorption-dominant to reflection-dominant when the HFOs/MXene assembling cycles was more than 5 (Fig. 12). The tunable EMI shielding mechanism of the HFOs/MXene composite cotton fabrics may be attributed to the transition from the impedance match to impedance mismatch.

Conclusion The good EMI shielding performance of the HFOs/MXene composite fabric is attributed to the synergistic effects between hollow magnetic Fe3O4 nanospheres and MXene, and the multilayer heterogeneous structure, including the conductive loss from MXene nanosheets, magnetic loss of HFOs and inner multiple reflection from the multilayer heterogeneous structure. The high electrical conductivity and good EMI shielding performance of HFOs/MXene composite cotton fabric makes is attractive in the application of flexible electromagnetic protection, wearable heater, and sensors.

Key words: transition metal carbides/nitride, Fe3O4 nanosphere, composite cotton fabric, layer-by-layer assembly, electromagnetic interference shielding, shielding mechanism

CLC Number: 

  • TS195.5

Fig. 1

Schematic illustration of preparation and EMI shielding of hollow magnetic Fe3O4 nanospheres/MXene composite cotton fabric"

Fig. 2

Crystalline structure and microstructures of hollow magnetic Fe3O4 nanospheres. (a) XRD pattern; (b) TEM image; (c) HRTEM image; (d) Lattice fringes"

Fig. 3

Super depth 3D microscope images of cotton fabrics. (a) Original sample; (b) MF1; (c) MF3; (d) MF5; (e) MF9; (f)MF11"

Fig. 4

SEM images of cotton fabrics. (a) Original sample; (b) MXene modified fabric; (c) MF11"

Fig. 5

EDS images of MF11 fabric. (a) SEM image;(b) C;(c) O; (d) Ti; (e) Fe; (f) Hierarchical EDS image"

Fig. 6

EDS energy spectrum of MF11 fabric"

Fig. 7

XRD patterns of composite cotton fabrics"

Fig. 8

Sheet resistance of composite cotton fabrics"

Fig. 9

Air permeability and washing fastness of composite cotton fabrics. (a) Demonstration of air permeability;(b)Before washing;(c) After washing"

Fig. 10

Plots of EMI SE versus frequency for hollow magnetic Fe3O4 nanospheres/MXene composite cotton fabric"

Fig. 11

Total electromagnetic interference effectiveness (a), reflective and absorption electromagnetic interference effectiveness (b) of composite cotton fabrics"

Fig. 12

Reflection, absorption and transmission shielding coefficient of composite cotton fabrics"

Fig. 13

Electromagnetic interference shielding mechanism of hollow magnetic Fe3O4 nanospheres/MXene composite cotton fabric"

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