Yong Shen’s research while affiliated with Shanghai University of Engineering Science and other places

Wearable functional textiles have drawn extensive attention in a wide range of industries due to their distinctive advantages. Unfortunately, conventionally developed microwave-absorbing textiles are generally limited in practical applications because of their subpar performance in terms of stability and poor durability. Superhydrophobic and microwave absorption multifunctional cotton fabrics were produced based on nanostructured CuS/reduced graphene oxide (RGO)/cellulose nanofiber (CNF) composites combined with polydimethylsiloxane (PDMS). When the CuS/RGO/CNF composites and PDMS concentration is 5 wt% and 2 wt%, respectively, the WCA value is 155.6°. With a minimal thickness of 3.0 mm, it achieves a minimum reflection loss (RLmin) of –32.90 dB and boasts a broad effective absorption bandwidth (EAB). This performance is attributed to the synergistic effects of conduction loss, interface polarization loss, and the surface roughness topography of the fabric. The combination of high-efficiency microwave absorption, superhydrophobicity, and excellent durability makes treated cotton fabrics a highly promising candidate for a wide range of applications. These characteristics make microwave absorption cotton fabrics a promising contender in various fields with great potential.

To address the issue of electromagnetic radiation, it was essential to create a thin, lightweight absorber that possesses a broad bandwidth and superior absorption capabilities. In this study, MoS2/RGO composites with three-dimensional multilayer flower-like structures were synthesized by hydrothermal method with graphene oxide (GO). Effect of hydrothermal temperature, hydrothermal time and GO introduction on structure and microwave absorption of MoS2/RGO composites were investigated. The results indicated that the optimum conditions for hydrothermal growth of MoS2/RGO were determined to be hydrothermal temperature of 220 °C and hydrothermal time of 12 h. Additionally, the suitable introduction of GO was found to be 40wt%. The synthesized MoS2/RGO composites exhibited excellent microwave absorbing property with reflection loss of -50.11 dB at 8.96 GHz benefiting from its complex flower-like structure. The effective absorption bandwidth was up to 3.62 GHz (7.61–11.23 GHz), when the filler ratio was only 15 wt%. Potential absorption mechanism was proposed that the cooperation of the interfacial polarization, impedance matching, and dielectric losses was caused by the synergistic effects among RGO and MoS2. This work offered an efficacious reference idea for the device of novel and significant wave absorbers.

Durable superhydrophobic fabrics with electromagnetic wave absorption were highly valuable in practical applications. In this work, durable superhydrophobic cotton fabrics with electromagnetic wave absorption were successfully prepared by modifying the cotton fabrics with polydopamine (PDA) and then depositing MoS2/RGO (MR) composites and polydimethylsiloxane (PDMS). The surface morphology, crystal structure, and thermal degradation properties of the obtained products were evaluated. The PDA modification enhanced the affinity and adsorption saturation between the fabrics and the MR composites. Here, the MR composites provided the fabrics with wave-absorbing components and rough micro/nanostructure, and the PDMS offered lower surface energy for the treated fabrics. Ultimately, the water contact angle (WCA) of the obtained cotton fabrics could reach 157.2 ± 0.4 ° and the minimum reflection loss (RLmin) was −45.3 dB at 11.1 GHz, which showed excellent superhydrophobicity and microwave absorption properties. In addition, the obtained cotton fabrics displayed excellent robustness against rubbing, bending, and laundrying and satisfactory chemical stability. This research showed promising prospects for the development of wearable materials with durable electromagnetic wave absorption.

Graphene/Ag composite aerogels (GA/Ag) with three-dimensional hierarchical porous microstructure were prepared by in-situ formation of silver nanoparticles obtained from AgNO 3 into the porous structure of graphene aerogel. When the used AgNO 3 concentration was 12[Formula: see text]wt.%, the specific surface area of the obtained GA/Ag was 128.6[Formula: see text]m ² g[Formula: see text], which was higher than that of GA. GA/Ag exhibited electrical resistivity of 0.63[Formula: see text][Formula: see text][Formula: see text]cm and excellent microwave absorption property with the minimum reflection loss of −40[Formula: see text]dB at 10.9[Formula: see text]GHz with the corresponding effective absorption bandwidth of 4[Formula: see text]GHz (8.8–12.8[Formula: see text]GHz). The GA/Ag composite aerogels enabled multiple reflection loss and absorption of incident electromagnetic waves, realizing excellent microwave absorption effects based on impedance matching and efficient synergy. It could be predicted that GA/Ag with a hierarchical porous structure may show potential application prospects in the field of microwave absorption.

Electromagnetic interference (EMI) shielding fabrics have a wide range of applications for human and equipment protection. However, it is a challenge for single electromagnetic shielding textiles to apply in the harsh practical environments. Herein, superhydrophobic electromagnetic shielding polyester fabric obtained through combining the conductive network of MXene, the rough microstructure of cellulose nanofibers (CNFs), and low surface energy polydimethylsiloxane modification. Its composition, morphology, water contact angle (WCA) and electromagnetic interference shielding effectiveness (EMI SE) were characterized. MXene nanosheets grew on the fabric surface and formed a perfect conductive network between different fabric. The continuous MXene conductive network provided the basis for electronic transmission, endowing the prepared fabric with high EMI SE (~ 34 dB). Meanwhile, with the synergistic effect of micro-nano roughness and low surface energy modification, the treated fabric demonstrated remarkable superhydrophobic properties and showed a superior WCA (~ 164.3°). Furthermore, the treated polyester fabric demonstrated high electromagnetic interference shielding performance with excellent stability and durability. This work provided a feasible method for fabricating superhydrophobic electromagnetic shielding fabric, which will have wide application prospect in the fields of electromagnetic shielding, human body protection and military affairs.

Durable superhydrophobic fabrics with electromagnetic wave absorption were highly valuable in practical applications. In this work, durable superhydrophobic cotton fabrics with electromagnetic wave absorption were successfully prepared by modifying the cotton fabrics with polydopamine (PDA) and then depositing MoS 2 /RGO (MR) composites and polydimethylsiloxane (PDMS). The surface morphology, crystal structure, and thermal degradation properties of the obtained products were estimated. The PDA modification enhanced the affinity and adsorption saturation between the fabrics and the MR composites. Here, the MR composites provided the fabrics with wave-absorbing components and rough micro/nanostructure, and the PDMS offered lower surface energy for the treated fabrics. Utimately, the water contact angle (WCA) of the obtained cotton fabrics could reach 157.2±0.4 ° and the minimum reflection loss (RL min ) was -45.3 dB at 11.1 GHz, which showed excellent superhydrophobicity and microwave absorption properties. In addition, the obtained cotton fabrics displayed excellent robustness against rubbing and bending and satisfactory chemical stability. This research showed promising prospects for the development of wearable materials with durable electromagnetic wave absorption.