Issue 47, 2021

Synthesis of Si–C–N aligned nanofibers with preeminent electromagnetic wave absorption in ultra-broad band

Abstract

As other one-dimensional materials, SiC-based nanofibers possess high temperature resistance and good electromagnetic wave absorption with the absorbing mechanism of polarization loss. To overcome the narrow effective absorbing broadband (EAB) and insufficient reflection coefficient (RC), a kind of Si–C–N aligned nanofiber rich in conducting networks and heterogeneous interfaces was designed to assemble the conductive loss and polarization loss in a proportion of 6 : 4. Synthesized via electrospinning combined with polymer-derived-ceramic methods, the prepared nanofibers showed good degree of orientation, a small diameter less than 300 nm and a multiphase structure containing SiC crystallites, Si3N4 crystallites, a carbon phase and an amorphous Si–O–C–N phase. The crystallization, chemical composition and absorbing performance of nanofibers heat-treated at 1300–1600 °C were investigated in detail. The Si–C–N aligned nanofibers with a small thickness of 2.3 mm prepared at 1300 °C represented prominent absorption that the minimum RC sank down to −54.24 dB at 17.84 GHz, while 3.0 mm-thick nanofibers heated at 1500 °C exhibited ultra-broad EAB that went up to 8.93 GHz (cover 9.07–18 GHz). With the thickness varying from 2.5 mm to 10 mm, EAB gradually shifted from high frequency to low frequency in the measured band of 2–18 GHz. The synergistic effect of conductive loss, polarization loss and good impedance matching contributed to the performed ultrawide EAB and strong absorption. The prepared Si–C–N nanofibers are considered promising candidates of high-temperature-stable absorbents under harsh conditions.

Graphical abstract: Synthesis of Si–C–N aligned nanofibers with preeminent electromagnetic wave absorption in ultra-broad band

Supplementary files

Article information

Article type
Paper
Submitted
05 Aug 2021
Accepted
29 Sep 2021
First published
09 Oct 2021

J. Mater. Chem. C, 2021,9, 16966-16977

Synthesis of Si–C–N aligned nanofibers with preeminent electromagnetic wave absorption in ultra-broad band

Z. Li, F. Ye, L. Cheng, P. Wang, C. Guo, M. Li and L. Zhang, J. Mater. Chem. C, 2021, 9, 16966 DOI: 10.1039/D1TC03663G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements