Formation of Sn filled CNTs nanocomposite: Study of their magnetic, dielectric properties and enhanced microwave absorption performance at gigahertz frequencies. Issue 15 (1st August 2022)

• Record Type: Journal Article
• Authors: Wang, Dongxing; Saleem, Muhammad Farooq; Javid, Muhammad; Qu, Xinghao; Farid, Amjad; Irfan, Muhammad; Xu, Xiaohui; Dong, Xinglong
• Is Part Of: Ceramics international. Volume 48:Issue 15(2022)
• Page Start: 22002
• Page End: 22012
• Publication Date: 2022-08-01
• Subjects: carbon Nanotubes -- Nanocomposite -- Ferromagnetism -- Microwave absorption; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.04.183
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The Simplistic formation, advantageous configuration, non-colossal magnetoresistance and broadband absorption are important parameters for microwave absorbent materials. In this study, a core-shell nanocomposite comprising of Sn-filled carbon nanotubes (Sn/CNTs) was prepared by arc discharge method. The microstructure, morphology and surface composition of Sn/CNTs-based core-shell nanocomposites were characterized in detail. Sn/CNTs nanocomposite showed a magnetic signal due to the broken bonds and defects at interfaces in Sn/CNTs. The weak ferromagnetism was found to be helpful in improving magnetic permeability in the Sn/CNTs which confirms its role as a magnetic loss material under incident electromagnetic wave. Sn-filled CNTs revealed an appropriate value of dielectric constant, which plays an important role in impedance matching upon incident electromagnetic wave. The composite of Sn-CNTs and paraffin with a 50 wt % loading showed the lowest reflection loss (RL) of −43.87 dB at 10 GHz, with a wide effective absorption band (RL ≤ −10 dB) of 3 GHz in thickness of 2.3 mm. This enhanced performance is attributed to the combined effect of the conduction loss in one-dimensional core-shell architecture, the interfacial loss Sn-CNT interface, the magnetic loss due to defects-induced ferromagnetism in Sn shell, and in the carbon-containing atomic layers of CNTs.