Flexible and hydrophobic CoFe-LDH @Co MOF @biomass-derived carbon fabrics for effective near-infrared photothermal conversion and electromagnetic attenuation

Abstract

Near-infrared (NIR) laser countermeasures firing systems and electromagnetic wave shielding are extremely important in military warfare. Herein, a series of biomass-derived carbon flexible textiles with NIR photothermal conversion and microwave absorption capabilities were created by pyrolysis at temperatures ranging from 700 to 1000 °C. A hydrothermal approach was employed to create 2D CoFe-layered double hydroxides (CoFe-LDH), whose positively charged characteristics were securely attached to the hydroxide clusters on the surface of cotton fibers via electrostatic interaction. Subsequently, the adjustable layer spacing of LDH provides ideal in situ growth sites for metal ions and organic ligands of Co MOF. CoFe-LDH@Co MOF@PDMS cotton-derived carbon textiles (CoFe@PCCF) were successfully made using high-temperature pyrolysis, annealed carbonization, and polydimethylsiloxane curing. The intrinsic light absorption of the interwoven and entangled carbon fibers, combined with the plasmonic resonance of its surface metal particles, promotes photothermal conversion of the material, reduces density, and increases absorption during multiple reflections of electromagnetic waves. Furthermore, its qualities can be optimized and modified by modifying parameters like as carbonization temperature and thickness. As a result, CoFe@PCCF-900 shows the minimum reflection loss (RLmin) of −23.03 dB at 1.6 mm thickness and an effective absorption bandwidth (EAB) of 4.53 GHz. The surface temperature of CoFe@PCCF-1000 reaches 74.5 ℃ after 3 seconds of NIR (980 nm, 200 mW) light, indicating quick and stable photothermal conversion. This work provides an opportunity for laser shooting and electromagnetic attenuation low-cost materials.