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Electromagnetic absorption properties of Sn-filled multi-walled carbon nanotubes synthesized by pyrolyzing |
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| Authors: | Hong Zhu Lan Zhang Yuan Song Yongming Zhang |
| Affiliation: | a School of Science, State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China b Department of Chemistry, School of Science, Beijing Jiaotong University, Beijing 100044, China |
| Abstract: | Multi-walled carbon nanotubes (MWCNTs) filled with Sn nanocrystals were synthesized by metal-organic chemical vapour deposition at relatively lower pyrolysis temperature. Their electromagnetic parameters and microwave absorbing properties were investigated in the frequency range of 2-18 GHz. An obvious increase in the complex permittivity and electric loss tangent of the Sn-filled MWCNTs has been observed. The dielectric and magnetic properties were significantly improved. The Sn nanocrystals encapsulated in MWCNTs modify the electromagnetic parameters of the MWCNTs. The variation of the normalized input impedance induces the enhancement of absorbing properties. The modified MWCNTs exhibit much broader absorbing bandwidth and larger reflectivity than those of unfilled MWCNTs. The calculated results indicate that the Sn-filled MWCNTs have excellent absorbing properties and potential applications in thin thickness and light weight microwave absorbers. |
| Keywords: | Nanocomposites Chemical vapour deposition Carbon nanotubes Sn Dielectric properties Microwave absorbers |
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