In Situ Growth of Core-Sheath Heterostructural SiC Nanowire Arrays on Carbon Fibers and Enhanced Electromagnetic Wave Absorption Performance

Liwen Yan; Changqing Hong; Boqian Sun; Guangdong Zhao; Yehong Cheng; Shun Dong; Dongyang Zhang; Xinghong Zhang

doi:10.1021/acsami.6b15795

In Situ Growth of Core-Sheath Heterostructural SiC Nanowire Arrays on Carbon Fibers and Enhanced Electromagnetic Wave Absorption Performance

ACS Appl Mater Interfaces. 2017 Feb 22;9(7):6320-6331. doi: 10.1021/acsami.6b15795. Epub 2017 Feb 8.

Authors

Liwen Yan¹, Changqing Hong¹, Boqian Sun¹, Guangdong Zhao¹, Yehong Cheng¹, Shun Dong¹, Dongyang Zhang¹, Xinghong Zhang¹

Affiliation

¹ National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Center for Composite Materials and Structures, Harbin Institute of Technology , Harbin 150080, P. R. China.

PMID: 28120608
DOI: 10.1021/acsami.6b15795

Abstract

Large-scale core-sheath heterostructural SiC nanowires were facilely grown on the surface of carbon fibers using a one-step chemical vapor infiltration process. The as-synthesized SiC nanowires consist of single crystalline SiC cores with a diameter of ∼30 nm and polycrystalline SiC sheaths with an average thickness of ∼60 nm. The formation mechanisms of core-sheath heterostructural SiC nanowires (SiC_nws) were discussed in detail. The SiC_nws-CF shows strong electromagnetic (EM) wave absorption performance with a maximum reflection loss value of -45.98 dB at 4.4 GHz. Moreover, being coated with conductive polymer polypyrrole (PPy) by a simple chemical polymerization method, the SiC_nws-CF/PPy nanocomposites exhibited superior EM absorption abilities with maximum RL value of -50.19 dB at 14.2 GHz and the effective bandwidth of 6.2 GHz. The SiC_nws-CF/PPy nanocomposites in this study are very promising as absorber materials with strong electromagnetic wave absorption performance.

Keywords: SiC nanowires; carbon fiber; core−sheath; electromagnetic wave absorption; heterostructure.