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2022
Journal Article
Titel
Nanocellulose-polysilazane single-source-precursor derived defect-rich carbon nanofibers/SiCN nanocomposites with excellent electromagnetic absorption performance
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.
Author(s)
Liu, Xingmin
Institut für Materialwissenschaft, Technische Universität Darmstadt and State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an
Li, Minghang
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an
Liu, Heqiang
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an
Duan, Wenyan
Key Laboratory of Space Manufacturing Technology (SMT), Chinese Academy of Sciences, Beijing
Fan, Xiaomeng
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an
Riedel, Ralf
Institut für Materialwissenschaft, Technische Universität Darmstadt and Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an