Ultra-light, high flexible and efficient CNTs/Ti3C2-sodium alginate foam for electromagnetic absorption application

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2019,（12）
• 页码范围: 2859-2867
• 页数: 9页
• 语种: 英文

摘要

Ultra-light carboxylic functionalized multi-walled carbon nanotubes (CNTs-COOH) and Ti3C2 MXene hybrids modified sodium alginate (CNTs/Ti3C2-SA) based composite foams were prepared through ice-templated freeze-drying method.The microstructure of the synthesized CNTs/Ti3C2 hybrids and CNTs/Ti3C2-SA foams is characterized by the presence of CNTs inserted between MXene layers which prevents their restacking.The resultant CNTs/Ti3C2 hybrids exhibit a unique sandwich-like hierarchical structure.Scanning electron microscopy (SEM) images show that the CNTs/Ti3C2-SA foam exhibits a heterogeneous anisotropic microstructure and CNTs/Ti3C2 hybrids are homogeneously dispersed in the skeleton of the porous foam.In case that the content of the hybrids amounts 40 mg/cm3,the CNTs/Ti3C2SA foam possesses excellent electromagnetic (EM) absorption performance with a minimum reflection coefficient (RCmin) as low as-40.0 dB.In case of a sample thickness of 3.95 mm,the RCmin reaches-24.4 dB and the effective absorption bandwidth covers the whole X band from 8.2 to 12.4 GHz.A control test shows that,with the same absorbent content,the CNTs/Ti3C2-SA foam exhibits a far better EM performance than that of CNT-free Ti3C2-SA foam.