Ultralight and hydrophobic MXene/chitosan-derived hybrid carbon aerogel with hierarchical pore structure for durable electromagnetic interference shielding and thermal insulation

MOF-Derived Co/C and MXene co-Decorated Cellulose-Derived Hybrid Carbon Aerogel with a Multi-Interface Architecture toward Absorption-Dominated Ultra-Efficient Electromagnetic Interference Shielding

“…To further clarify the EMI shielding mechanism of the resultant carbon aerogels, the EMI SE and power coefficients as a function of electrical conductivity are comprehensively studied (the corresponding results are depicted in Figure S10 and the detailed discussion is provided in the Supporting Information). In comparison with the EMI shielding materials in previously reported literature (Figure h and Table S1), ,− ,,− the prepared hybrid carbon aerogel exhibits high-efficiency EMI SE and superior absorption coefficient simultaneously, showing apparent competitivity.…”

“…MXenes, a novel class of two-dimensional (2D) materials referring to transition metal carbides and/or nitrides, exhibit attractive competitive advantage in EMI shielding field, profiting from their metal-like electrical conductivity, unique lamellar structure, and large aspect ratio. In addition, the surface of MXenes is rich in oxygen-containing functional groups, endowing them with good dispersity in polymer matrixes. ,− Consequently, incorporating MXene into polymer matrixes has been extensively adopted to manufacture porous CPCs for EMI shielding applications. However, realizing moderate EMI shielding performance (over 50 dB) always needs high filler content and large shielding thickness for such porous CPCs thanks to the insulating feature of matrixes and high percolation threshold, , which tremendously constraints their comprehensive practicability.…”

“…Particularly, thin thickness and lightweight are two vital indicators for EMI shielding materials employed in automobiles, aircraft, and new-generation electronic equipment applications. In this regard, porous conductive polymer composites (CPCs), such as CPCs aerogels, foams, and sponges, have received enormous interest because of their merits of lightweight, favorable processability, exclusive three-dimensional (3D) structure, and adjustable EMI shielding performance. ,− …”

“…In addition, the surface of MXenes is rich in oxygen-containing functional groups, endowing them with good dispersity in polymer matrixes. ,− Consequently, incorporating MXene into polymer matrixes has been extensively adopted to manufacture porous CPCs for EMI shielding applications. However, realizing moderate EMI shielding performance (over 50 dB) always needs high filler content and large shielding thickness for such porous CPCs thanks to the insulating feature of matrixes and high percolation threshold, , which tremendously constraints their comprehensive practicability. Fortunately, hybrid carbon aerogels derived from porous CPCs through a simple carbonization strategy could achieve high-efficiency EMI shielding effectiveness (SE) under low filler content and thin thickness benefiting from the formation of an interconnected conductive network. − In addition, abundant heterointerfaces existed in the hybrid carbon aerogels benefit to enhance interfacial polarization.…”

Biopolymer‐Based Aerogels for Electromagnetic Wave Shielding and Absorbing

“…For instance, Zhang's group assembled mechanically robust MXene/chitosan‐derived carbon aerogels via freeze‐drying and annealing treatment (Figure 4a). [ 52 ] Since both chitosan and MXene were negatively charged, the electrostatic repulsion ensured good dispersion of MXene nanosheets. Meanwhile, hydrogen bonds were formed between the –OH of MXene and the –NH 2 of chitosan, resulting in the high mechanical robustness of aerogel.…”