期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 19, 页码 17706-17713出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b03944
关键词
zeolitic imidazolate frameworks; electromagnetic wave absorbing; nanocomplex; heterostructure; coordination reaction
资金
- National Natural Science Foundation of China [21875190]
- Natural Science Basic Research Plan in Shaanxi Province of China [2018JC-008]
- Shaanxi Province Key Research and Development Plan for Industry Innovation Chain (Cluster) [2018ZDCXL-GY-09-07]
- Analytical and Testing Center of NPU
- Engineering and Physical Sciences Research Council (EPSRC) [EP/N007921, EP/N032861/1]
- EPSRC [EP/N032861/1] Funding Source: UKRI
Zeolitic imidazolate frameworks (ZIFs), a group of metal-organic frameworks (MOFs), hold promise as building blocks in electromagnetic (EM) wave absorbing/shielding materials and devices. In this contribution, we proposed a facile strategy to synthesize three-dimensional ZIF-67-based hierarchical heterostructures through coordinated reaction of a preceramic component, poly(dimethylsilylene)diacetylene (PDSDA) with ZIF-67, followed by carbonizing the PDSDA-wrapped ZIF at high temperature. The introduction of PDSDA leads to controllable generation of a surface network containing branched carbon nanotubes and regional distributed graphitic carbons, in addition to the nanostructures with a well-defined size and porous surface made by cobalt nanoparticles. The surface structures can be tailored through variations in pyrolysis temperatures, therefore enabling a simple and robust route to facilitate a suitable structural surface. The heterostructure of the ZIF nanocomplex allows the existence of dielectric loss and magnetic loss, therefore yielding a significant improvement on EM wave absorption with a minimum reflection coefficient (RCmin) of -50.9 dB at 17.0 GHz at a thickness of 1.9 mm and an effective absorption bandwidth (EAB) covering the full Ku-band (12.0-18.0 GHz).
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