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

作　　者：Xingmin Liu Nan Chai Zhaoju Yu Hailong Xu Xinliang Li Jiquan Liu Xiaowei Yin Ralf Riedel 

机构地区：[1]College of Materials,Key Laboratory of High Performance Ceramic Fibers(Xiamen University),Ministry of Education,Xiamen,361005,China [2]Institutfiir Materialwissenschaft,Technische Universitdt Darmstadt,D-64287,Darmstadt,Germany [3]College of Materials,Fujian Key Laboratory of Advanced Materials,Xiamen University,Xiamen,361005,China [4]Science and Technology on Thermostructural Composite Materials Laboratory,Northwestern Polytechnical University,Xi'an,710072,China [5]Technische Universitat Darmstadt,Eduard-Zintl-lnstitutfur Anorganische und Physikalische Chemie,Alarich-Weiss-Straβe 4.D-64287,Darmstadt,Germany

出　　处：《Journal of Materials Science & Technology》2019年第12期2859-2867,共9页材料科学技术（英文版）

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/cm^3, the CNTs/Ti3C2-SA 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 RCminreaches-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.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/Ti3C2-SA foam possesses excellent electromagnetic（EM） absorption performance with a minimum reflection coefficient（RCmin） as low as-40.0 d B. In case of a sample thickness of 3.95 mm, the RCminreaches-24.4 d B 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.

关 键 词：Carbon nanotubes MXene Sodium alginate Electromagnetic absorption properties 

分 类 号：TB332[一般工业技术—材料科学与工程]