Hydrophobic MXene/Hydroxyethyl Cellulose/Silicone Resin Composites with Electromagnetic Interference Shielding

Abstract

Exploring a method to fabricate robust and stable 3D conductive networks in polymers matrix is still the challenge in the research and development of electromagnetic interference (EMI) shielding materials. Here, a feasible approach is provided to produce high‐performance, silicone‐doped MXene EMI shielding composites. The trace amount of hydroxyethyl cellulose is deliberately applied as gels to construct the MXene aerogels with a stable and highly conductive network by the freeze‐drying method. For more desirable mechanical and waterproof properties, the silicone resin is introduced into the MXene aerogels on purpose. The best silicone‐doped MXene EMI shielding composites display a superior electrical conductivity of 3166.4 S m−1, and EMI shield effectiveness of 74.5 dB at the X‐band (8.2–12.4 GHz). It is worth noting that the introduction of silicone resins sharply improves the hydrophobicity of EMI shielding materials to a range of water contact angle of about 151.5°–155.0°. This is a promising method to make MXene‐based EMI shielding composites with self‐cleaning function.

Mechanically Strong and Tailorable Polyimide Aerogels Prepared with Novel Silicone Polymer Crosslinkers

“…Over the past few decades, aerogels made from polymer have been developed, such as phenol-formaldehyde resin [ 10 ], polyurethanes [ 11 ], polyureas [ 12 ], polyamides [ 13 ], and polyimide [ 14 ]. Compared to other aerogels, PI aerogels attracted more attention from researchers due to perfect chemical stability [ 15 ], good mechanical properties [ 16 ], perfect dielectric performance [ 17 , 18 ] and high decomposition temperatures [ 19 , 20 ].…”

Three-Dimensional Porous Ti3C2Tx MXene-Based Hybrids Formed by Charge-Driven Assembly

“…17−20 In this regard, various secondary components with distinctive shapes (2D, 1D, and 0D) and chemical properties have been used to stimulate the porous morphology of MXene nanosheets. For instance, the gelation ability of GO upon reduction, 21 the self-gelation of some polymers and fibers, 9,10,17,22,23 the presence of second components or ice as the templates, 7,24 and the in situ polymerization of monomers in the presence of MXene 25−28 assisted the formation of porous MXene assemblies. In these studies, hydrogen or chemical bonding between MXene nanosheets and the other materials was responsible for integrating the components.…”

“…Ti 3 C 2 T x MXene (T x : OH, O, F, Cl), a member of the two-dimensional transition metal carbide family, has attracted significant attention due to a unique combination of electrical conductivity, mechanical properties, abundant functional surface groups, and efficient absorption of electromagnetic waves . Such distinctive features have made MXene a great candidate for energy storage, water purification, sensors, and electromagnetic interference (EMI) shielding. , However, for each specific application, in addition to the inherent properties of MXene nanosheets, their configuration in 3D space significantly affects the performance. − For instance, an electroconductive porous MXene skeleton has become an essential class of MXene assemblies for effective EMI shielding. − Aside from preventing the face-to-face stacking of MXene nanosheets, the morphology of internal pores can significantly influence the damping of incident electromagnetic waves. − Nevertheless, the control over designing MXene aerogels with particular pore sizes and shapes remains challenging.…”

“…Although a stable MXene dispersion is a prerequisite to controlling the 3D connection of nanosheets, the homogeneous distribution of negatively charged groups on the MXene surfaces and the smaller lateral size of MXene compared to other nanosheets such as graphene oxide (GO) make their spontaneous gelation difficult. , Still, the functional groups on MXene surfaces enable interactions with other materials and crosslinkers, facilitating the 3D assembly of MXene nanosheets. − In this regard, various secondary components with distinctive shapes (2D, 1D, and 0D) and chemical properties have been used to stimulate the porous morphology of MXene nanosheets. For instance, the gelation ability of GO upon reduction, the self-gelation of some polymers and fibers, ,,,, the presence of second components or ice as the templates, , and the in situ polymerization of monomers in the presence of MXene − assisted the formation of porous MXene assemblies. In these studies, hydrogen or chemical bonding between MXene nanosheets and the other materials was responsible for integrating the components.…”

Mechanically Robust Flexible Multilayer Aramid Nanofibers and MXene Film for High-Performance Electromagnetic Interference Shielding and Thermal Insulation

“…Recently, different polymers or nanofibers have been introduced to MXene through rich groups on the surface of MXene and polymers or nanofibers to improve its overall mechanical properties [10,[30][31][32][33][34]. Sun et al constructed a nacre-like brick-and-mortar microstructure film composed of MXene and xanthan gum, showing a strong tensile strength of about 116.48 MPa while maintaining high conductivity, which was much higher than that of pure MXene film [35].…”