Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 39, Pages 35959-35968Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b10168
Keywords
MOF derivatives; Co/ZrO2/C nanocomposites; interfacial polarization; ultra-broadband; EM wave absorption
Funding
- National Natural Science Foundation of China [51572157]
- Natural Science Foundation of Shandong Province [ZR2016BM16]
- Qjlu Young Scholar Program of Shandong University [31370088963043]
- Fundamental Research Funds of Shandong University [2018JC036, 2018JC046]
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Broadband absorbers derived from metal-organic frameworks are highly desirable in the electromagnetic (EM) wave absorption field. Herein, a strategy for cobalt-decorated porous ZrO2/C hybrid octahedrons by pyrolysis of Co(NO3)(2)-impregnated NH2-UIO-66 was developed. The hybridization of Co nanoparticles with ZrO2/C results in remarkable EM wave absorption performance with a minimum reflection loss (RL) of -57.2 dB at 15.8 GHz, corresponding to a matching thickness of 3.3 mm. The maximum effective absorption bandwidth (RL <= -10 dB) reaches 11.9 GHz (6.1-18 GHz), covering 74.4% of the whole measured bandwidth. The textural properties of nanocomposites have been thoroughly characterized by powder X-ray diffraction, electron microscopy, X-ray photoelectron spectroscopy, and nitrogen adsorption-desorption isotherms. The corresponding results show that the face-centered cubic-phased similar to 50 nm Co nanoparticles are evenly distributed on the surface of porous ZrO2/C hybrid octahedrons. The excellent performance of Co/ZrO2/C can be ascribed to the strong interface polarization and the suitable impedance matching, originating from the synergistic effect among the components.
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