Hierarchically three-dimensional structure assembled with yolk-shelled spheres-supported nitrogen-doped carbon nanotubes for electromagnetic wave absorption. (15th November 2021)

• Record Type: Journal Article
• Authors: Cao, Fenghui; Xu, Jia; Zhao, Zhibo; Zhang, Xiao; Ouyang, Qiuyun; Zhu, Chunling; Zhang, Xitan; Zhang, Xiaoli; Chen, Yujin
• Is Part Of: Carbon. Volume 185(2021)
• Page Start: 177
• Page End: 185
• Publication Date: 2021-11-15
• Subjects: CNTs -- Yolk-shelled structure -- SiO2 -- Three-dimensional structure -- Electromagnetic wave absorption; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2021.09.026
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Rational design of the morphology and structure is important for the functional materials to improve their physicochemical properties. Herein, we design hierarchically three-dimensional (3D) structures assembled with yolk-shelled spheres-supported nitrogen-doped CNTs (NCNTs) using Ni(OH)2 @SiO2 core-shelled spheres as precursors for electromagnetic wave absorption. In the 3D structures, the yolk materials are SiO2 spheres, while the shell materials are N-doped carbon layers containing Ni, Si and O elements. Importantly, The NCNT arrays with encapsulated Ni NPs are branched out from the yolk-shelled spheres. The hierarchical structures feature the merits of both yolk-shelled and 3D structures. Furthermore, the SiO2 sphere in the 3D structure can tune the electrical conductivity, affording our hierarchically 3D structure better impedance matching characteristic for electromagnetic wave absorption. As a result, the reflection loss and effective absorption bandwidth of our optimal 3D structure can reach −59.90 dB and 4.24 GHz, respectively, while the thickness of the absorbing film is only 1.4 mm, superior to most of reported carbon-based absorbers. The present method for the regulation of the structure and morphology provides an efficient way to construction of high-performance electromagnetic wave absorbers. Graphical abstract: Image 1 Highlights: Yolk-shelled sphere-supported nitrogen-doped carbon nanotubes were fabricated. The hierarchical structures have the merits of both yolk-shelled and 3D structures. SiO2 sphere in the 3D structure can optimize impedance matching characteristic. The absorption bandwidth of the sample is 4.24 GHz with a thickness of 1.4 mm.