Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 34, Pages 29136-29144Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b09093
Keywords
heterobimetallic MOF; porous microrods; carbon; Co/ZnO/C composites; EM wave absorption
Funding
- National Nature Science Foundation of China [51673040]
- Natural Science Foundation of Jiangsu Province [BK20171357]
- Prospective Joint Research Project of Jiangsu Province [BY2016076-01]
- Opening Project of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control [KF201605]
- Fundamental Research Funds for Central Universities [2242018k30008]
- Scientific Innovation Research Foundation of College Graduate in Jiangsu Province [KYLX16_0266]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [1107047002]
- Fund Project for Transformation of Scientific and Technological Achievements of Jiangsu Province of China [BA2016105]
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Metal organic framework (MOF)-derived porous metal/C composites have drawn considerable attention from the microwave absorption field owing to their large pore volumes and surface areas. Exploring single-MOF-derived materials with high intensity and broadband absorption is largely needed but remains a challenge. Here, porous Co/ZnO/C (CZC) microrods were fabricated easily from cuboid-shaped heterobimetallic MOFs. CZC provides an efficient platform for integrating different semiconductors (ZnO), magnetic metal (Co), and carbon sources into one particle, which enhances the electromagnetic (EM) wave-absorbing ability. The carbonization temperature which is critical for EM parameters was studied in detail. CZC annealed at 700 degrees C outperformed those obtained at 600 or 800 degrees C in terms of microwave wave-absorbing properties. The reflection loss (RL) was optimized to -52.6 (or -20.6) dB at 12.1 (or 14.8) GHz with an effective bandwidth (RL <=-10 dB) of 4.9 (or 5.8) GHz at the coating thickness of 3.0 (or 2.5) mm. Such enhancement of EM wave-absorbing capabilities is ascribed to the well-built porous structure, dielectric loss, and magnetic loss. This work offers a new way to prepare porous magnetic metal/C composites with excellent microwave-absorbing properties starting from heterobimetallic MOFs.
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