Bimetallic zeolitic imidazolate frameworks-derived porous carbon-based materials with efficient synergistic microwave absorption properties: the role of calcining temperature. Issue 73 (2nd October 2017)

• Record Type: Journal Article
• Authors: Wang, Suyun; Ke, Xiang; Zhong, Suting; Lai, Yaru; Qian, Danlin; Wang, Yanping; Wang, Qinghua; Jiang, Wei
• Is Part Of: RSC advances. Volume 7:Issue 73(2017)
• Page Start: 46436
• Page End: 46444
• Publication Date: 2017-10-02
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra08882e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The porous and graphitized carbon-based materials prepared by sacrificing template and in situ reduction show an excellent microwave absorbing performance. Abstract : The composites of metal Co embedded in porous and N-doped graphitized carbon matrix (Co@pNGC) have been successfully synthesized by thermal decomposition of the bimetallic zeolitic imidazolate frameworks (bi-ZIFs) at different temperatures. The experimental results show that the calcination temperature played a decisive role on the graphitization, specific surface area, pore structure and electromagnetic wave (EM) absorption properties of Co@pNGC. The composites, Co@pNGC-600 and Co@pNGC-700 obtained at 600 °C and 700 °C, respectively, exhibit an outstanding EM wave absorption performance, which attributes to the synergistic effects of dielectric and magnetic loss, porous structure and multicomponent interfaces. Specifically, the optimal reflection loss of Co@pNGC-600 is −50.7 dB at 11.3 GHz and the widest effective absorption bandwidth (<−10 dB) could reach upto 5.5 GHz (12.3–17.8 GHz). The minimum thickness corresponding to the effective absorption is only 1.2 mm for Co@pNGC-700. Hence, these obtained porous carbon composites are promising microwave absorbing materials due to their lightweight, thin thickness, low filling, broad bandwidth, and strong absorption.