Low-temperature carbonized carbon nanotube/cellulose aerogel for efficient microwave absorption. (1st September 2021)

• Record Type: Journal Article
• Authors: Wang, Yue-Yi; Zhou, Zi-Han; Zhu, Jin-Long; Sun, Wen-Jin; Yan, Ding-Xiang; Dai, Kun; Li, Zhong-Ming
• Is Part Of: Composites. Number 220(2021)
• Publication Date: 2021-09-01
• Subjects: Carbon aerogel -- Carbon nanotubes -- Cellulose -- Microwave absorption -- Low carbonation temperature; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2021.108985
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: Carbon aerogels derived from biomass have been considered as potential microwave absorption (MA) materials because of the intrinsic hierarchical porous structure, low density, and excellent heat resistance. However, high carbonation temperature or long carbonation time is always required to achieve optimized MA performance. Herein, the low-temperature carbonization of carbon nanotube (CNT)/cellulose aerogel was realized to develop a carbon aerogel for efficient MA. Compared with the carbon aerogel derived from pristine cellulose, the incorporation of CNT endowed the CNT/cellulose-derived carbon aerogel with improved dielectric loss, and thus improved MA performance at reduced carbonation temperature. The carbon aerogel carbonized at only 550 °C for 2 h exhibited a minimum reflection loss value of −43.6 dB and a broad effective absorption bandwidth (reflection loss below −10 dB) of 7.42 GHz. The low carbonation temperature and outstanding MA performance make this new carbon aerogel be promising candidate for MA applications. Graphical abstract: Image 1 Highlights: With the aid of CNT, desirable dielectric loss of resultant carbon aerogel was achieved at reduced carbonation temperature and time without destroying the intrinsic hierarchical porous structure. CNT was uniformly introduced into cellulose aerogel without damaging the structure. The carbon aerogel exhibited a minimum reflection loss value of -43.6 dB and a broad effective absorption bandwidth (reflection loss below -10 dB) of 7.42 GHz.