MOF−Guest complex derived Cu/C nanocomposites with multiple heterogeneous interfaces for excellent electromagnetic waves absorption. (15th April 2021)

• Record Type: Journal Article
• Authors: Jiao, Yingzhi; Cheng, Siyao; Wu, Fan; Pan, Xihao; Xie, Aming; Zhu, Xufei; Dong, Wei
• Is Part Of: Composites. Number 211(2021)
• Publication Date: 2021-04-15
• Subjects: Metal-organic frameworks (MOFs) -- Cu/C nanocomposite -- Interfacial polarization -- Electrical conductivity -- Electromagnetic absorption; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2021.108643
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: Electrical conductivity and interfacial polarization are two crucial factors to design high-performance electromagnetic absorption (EMA) materials, but how to synergistically balance these factors still remains to be difficult. In this work, we report the synthesis of Cu/C nanocomposites via the controlled pyrolysis of a MOF-guest complex. The prepared Cu/C nanocomposites are made up of cross-linked carbon network and various irregular particles. The carbon network provides appropriate electrical conductivity to contribute to the conductance loss. Multiple heterogeneous interfaces, such as Mo2 C/C, Mo2 C/CuO, CuO/C, Mo2 C/Cu, and Cu/C interfaces, have been determined in these Cu/C nanocomposites, resulting in obviously improved polarization loss. As a result, the Cu/C nanocomposite exhibits excellent EMA performance, where the efficient absorption bandwidth reaches 6.8 GHz, and the maximal absorption gets to −52 dB. This research provides new idea to design high-performance EMA nanocomposites by tuning the electrical conductivity and interfacial polarization. Graphical abstract: Image 1