Citation: LIU Yuan, JIA Ying, LI Rong. In-Situ Growth and Microwave Absorption Properties of Carbonyl Iron on Carbon Fiber Surface[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(2): 210-216. doi: 10.11862/CJIC.2020.041 shu

In-Situ Growth and Microwave Absorption Properties of Carbonyl Iron on Carbon Fiber Surface

Xi'an Research Institute of High Technology, Xi'an 710025, China

Corresponding author: LIU Yuan, liuyuanbixue@163.com
Received Date: 28 April 2019
Revised Date: 16 November 2019

Figures(6)

Fe(CO)₅ was used as precursor to construct nano-sized carbonyl iron (CI) shell on carbon fiber (CF) surface by metal organic chemical vapor deposition (MOCVD). The morphology and microwave absorption properties of core-shell powders were controlled by changing deposition temperature. The structure and electromagnetic properties of the powders were characterized by X-ray diffractometer, scanning electron microscopy and vector network analyzer. The results show that the carbonyl iron particles deposited on the surface of CF "merge and fuse" with the increase of deposition temperature (210~240℃). At this time, CF-CI forms a complete core-shell structure with thin film coating. When the deposition temperature is too high (270℃), the morphology of carbonyl iron shell on the surface of CF will deteriorate. The thickness of CI shell on CF surface can be effectively controlled by adjusting deposition temperature at nanoscale, thus the electromagnetic properties of CF-CI core-shell particles can be adjusted. The core-shell morphology and microwave absorption properties were taken as indexes to determine the optimum deposition temperature of 240℃. With the electromagnetic parameters of the samples obtained at 240℃, the maximum absorbing bandwidth is 4.6 GHz (13.4~18 GHz) when the thickness of the coating is 0.9 mm, the minimum reflectivity is -21.5 dB when the thickness of the coating is 2.0 mm, and the absorption intensity is less than -10 dB among the whole 2~18 GHz when the thickness of the coating is 0.9~3.9 mm.
- carbon fiber,
- carbonyl iron,
- core-shell,
- in-situ growth,
- electromagnetic wave absorption
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