Nanocellulose-polysilazane single-source-precursor derived defect-rich carbon nanofibers/SiCN nanocomposites with excellent electromagnetic absorption performance. (March 2022)

• Record Type: Journal Article
• Authors: Liu, Xingmin; Li, Minghang; Liu, Heqiang; Duan, Wenyan; Fasel, Claudia; Chen, Yongchao; Qu, Fangmu; Xie, Wenjie; Fan, Xiaomeng; Riedel, Ralf; Weidenkaff, Anke
• Is Part Of: Carbon. Volume 188(2022)
• Page Start: 349
• Page End: 359
• Publication Date: 2022-03
• Subjects: PDCs -- Nanocellulose -- Carbon nanofibers -- Defect-rich -- Electromagnetic absorption; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2021.11.058
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Ceramic SiCN nanocomposites modified with nanocellulose derived defect-rich carbon nanofibers (CNFs-SiCN) were developed by thermolysis of nanocelulose-polysilazane single-source precursors (SSPs). Multi-loss mechanisms (i.g. polarization loss and conductive loss) were established in the SiCN ceramic nanocomposites by employing the defect-rich structure of CNFs. Cole-Cole circle plots indicate that the CNFs-SiCN ceramics possess strong polarization capability due to the defect-rich structure of the CNFs. Dielectric loss values fitted by the Debye theory showed that the proportion of polarization loss reaches an unprecedented high value, accounting for 52.1% of the total dielectric loss. When the content of nanocellulose is 10 wt% of SSPs, the minimal reflection coefficient (RCmin ) and effective absorption bandwidth (EABs) of CNFs-SiCN ceramic can reach −36.3 dB and 3.0 GHz, respectively. This work may contribute new ideas for establishing multi-loss mechanisms in ceramic-based materials, finding a new application for nanocellulose, and shaping the design of novel absorbents. Graphical abstract: Image 1