Abstract
A simple method synthesizing hierarchically porous Co-based zeolitic imidazolate frameworks (ZIF-67) is presented. In approach, polyvinyl pyrrolidone (PVP) aggregates on graphene oxide (GO) surface through H-bond between oxygen-containing groups (OH and COOH) on GO and CO in PVP and the results GO/PVP composites is used as a template to synthesize hierarchically porous ZIF-67. After in situ postpyrolysis heat treatment in Ar atmosphere, honeycomb-like Co/C composites with abundant hierarchically pores are obtained. The hierarchically porous structure endows the as-obtained Co/C composites with highly efficient microwave absorption performances. The maximum reflection loss can reach −50.7 dB and the effective bandwidth is 4.6 GHz at a filler loading as low as 10 wt%. Notably, the electromagnetic parameters analysis indicates that such excellent microwave absorption properties are mainly ascribed to well-matched impedance combined with strong attenuation property induced by the hierarchically porous structure. More importantly, this strategy could also be used to fabricate other MOF-derived high performance microwave absorbers.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
