Facile synthesis of nickel/carbon nanotubes hybrid derived from metal organic framework as a lightweight, strong and efficient microwave absorber

Transition metal carbon composites derived from metal organic frameworks (MOFs) attract increasing attention in microwave absorption field. However, finding a relatively facile and green method to prepare MOFs precursor is still a challenge. Besides, it is also difficult to obtain carbon nanotubes based compounds by only using MOF as sacrificed template. Herein, nickel (Ni) MOF is fabricated at room temperature with water as solvent. Afterwards, nickel/carbon nanotubes composite (Ni/CN) is prepared via only in-situ pyrolysis of Ni MOF. The pyrolysis temperature greatly affects nitrogen (N) dopant state for Ni/CN composites. The Ni/CN composite prepared at 700 degrees C (Ni/CN-700) exhibits the maximum reflection loss (RL) of-65 dB with the effective absorbing bandwidth (EAB) about 4.6 GHz at 1.9 mm, when the filling loading is only 10 wt% in the matrix. Remarkably, the Ni/CN composite is excellent microwave absorber with lightweight and strong absorption. The magnetic metal/carbon nanotubes derived from MOF prepared in green solvent offers a facile, environmentally friendly and designable strategy for exploring excellent microwave absorber. (c) 2021 Elsevier Inc. All rights reserved.

Automated summary

Transition metal carbon composites derived from metal organic frameworks (MOFs) have attracted attention in microwave absorption field. The study successfully fabricated nickel MOF at room temperature with water as solvent, and prepared nickel/carbon nanotubes composite via in-situ pyrolysis, showing excellent microwave absorption properties. The doping state of nitrogen greatly affects the performance of the composites.