Hybrid zeolite imidazolate framework derived N-implanted carbon polyhedrons with tunable heterogeneous interfaces for strong wideband microwave attenuation. (15th April 2020)

• Record Type: Journal Article
• Authors: Liu, Panbo; Gao, Sai; Huang, Wenhuan; Ren, Juan; Yu, Danyang; He, Wenjuan
• Is Part Of: Carbon. Volume 159(2020)
• Page Start: 83
• Page End: 93
• Publication Date: 2020-04-15
• Subjects: Zeolite imidazolate framework (ZIF) -- Carbon materials -- Metal particles -- Heterogeneous interfaces -- Microwave absorption performance; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2019.12.021
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Rational manipulation of zeolite imidazolate framework derived carbon microwave absorbers is highly significant, but still remains a challenge. Herein, three kinds of multi-metallic doped N-implanted carbon polyhedrons (NCP), named Mo-NCP, W-NCP and MoW-NCP, with tailored composition and unique structure derived from the pyrolysis of hybrid zeolite imidazolate framework (HZIF) precursors have been fabricated. The architecture can be tuned from rhombic dodecahedral shape for W-NCP and MoW-NCP to chamfered cube shape for Mo-NCP, thereby adjusting their impedance matching and microwave attenuation. With a filler loading of 30 wt%, the obtained absorbers possess not only strong absorption capability, but also wide absorption bandwidth compared with NCP. As the best, the minimum R L of MoW-NCP is up to −55.6 dB at 11.3 GHz and the absorption bandwidth exceeding −10 dB remarkably reaches as wide as 8.8 GHz with a thickness of 2.8 mm. The excellent performance may be ascribed to the multi-heterogeneous interfaces and smaller metal nanoparticles, resulting in strong dipolar/interfacial polarizations, multiple scatterings, enhanced conduction loss and promoted impedance matching. This study not only broadens the limitation of traditional bimetallic ZIFs, but also pave a novel avenue for the design of novel N-implanted carbon microwave absorbers with tunable chemical composition and multi-heterogeneous interfaces. Graphical abstract: Image 1