期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 17, 页码 20459-20466出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c00281
关键词
2D-MOFs; template-assisted; surfactant-assisted; controllable growth; electromagnetic wave absorption
资金
- Key Research and Development Program of Zhejiang Province [2020C05014, 2020C01008]
- Ningbo Major Special Projects of the Plan Science and Technology Innovation 2025 [2018B10085]
The study demonstrates the successful fabrication of CoNi-MOF-71 nanosheet arrays with excellent control over 2D MOFs, leading to superior electromagnetic wave absorption properties in the resulting 2D derivatives.
Two-dimensional metal-organic frameworks (2D-MOFs) and their derivatives are promising for catalysis, energy storage, gas separation, etc. due to their unique microstructure and physicochemical properties. Many efforts have been devoted to fabricating 2D-MOFs with challenges remaining in yield and fine control of their thickness and lateral size. Here a versatile strategy has been used involving epitaxial, anisotropic, and confined growth of CoNi-MOF-71 nanosheet arrays, giving rise to excellent quantity and controllability of the 2D-MOFs. Electromagnetic (EM) wave absorption performance has been investigated for the resultant 2D Co/Ni/C derivatives. Compared with the bulk counterpart, significantly increased surface area, conductivity, and shape anisotropy for the 2D derivatives result in enhanced interfacial polarization, conductive loss, and magnetic resonance. As such, optimum EM wave absorption of minimum reflection loss RLmin = -49.8 dB and an ultrawide effective adsorption bandwidth EAB = 7.6 GHz can be achieved at a thickness of 2.6 mm. This work not only sheds light on the performance enhancement for 2D absorbers via synergistic effects of multiple attenuation mechanisms but also provides an effective fabrication route of ultrathin MOFs with high yield and uniform size for extended applications in catalysis, electrochemistry, and optoelectronics fields.
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