A simple approach to spherical nickel-carbon monoliths as light-weight microwave absorbers

Na Li, Minhua Cao*, Changwen Hu

*Corresponding author for this work

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Abstract

Spherical nickel-carbon (Ni-C) monoliths have been successfully synthesized via a solvothermal route and subsequent heat treatment without any templates, which offers a green and easier method to synthesize carbon-based materials. The macroscopical size of the spherical Ni-C monoliths is about 1 cm in diameter and the Ni nanoparticles are uniformly dispersed on the carbon matrix on a microscopic level. The resultant Ni-C monolith exhibited strong microwave absorption in the microwave range of 2-18 GHz at various loadings of nickel (10-30 wt%). Among these, the composite with an 18.2 wt% loading of Ni has a strong absorption peak at 13.7 GHz and achieves a maximum absorption value of 23.6 dB. More importantly, good reflection loss over a wide frequency range can be simply achieved by manipulating the absorber thickness, suggesting that these composites may be used as light-weight and highly effective microwave absorbers.

Original languageEnglish
Pages (from-to)18426-18432
Number of pages7
JournalJournal of Materials Chemistry
Volume22
Issue number35
DOIs
Publication statusPublished - 21 Sept 2012

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Li, N., Cao, M., & Hu, C. (2012). A simple approach to spherical nickel-carbon monoliths as light-weight microwave absorbers. Journal of Materials Chemistry, 22(35), 18426-18432. https://doi.org/10.1039/c2jm32853d