Hollow Ni-Co layered double hydroxides-derived NiCo-alloy@g-C3N4 microtubule with high-performance microwave absorption

• Published in: Materials letters Vol. 231; pp. 171 - 174
• Main Authors: Hu, Saichun, Zhou, Yuming, He, Man, Liao, Qiang, Yang, Haiyong, Li, Haifang, Xu, Ran, Ding, Qinghua
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.11.2018; Elsevier BV
• Subjects: Alloys; Anisotropy; Carbon nitride; Cyanuric acid; g-C3N4; Hydroxides; Magnetic materials; Matching layers (electronics); Materials science; Melamine; Methanol; Microstructure; Microwave absorbers; Microwave absorption; Nanoalloys; Nanoparticles; NiCo-LDH nanosheet; Thickness; g-C3N4; Magnetic materials; Microstructure; NiCo-LDH nanosheet
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2018.08.048

Hollow, magnetic, g-C3N4-based NiCo alloy microtubule consisting of NiCo alloy embedded on the surface of hollow tubule g-C3N4 were prepared through facile solvothermol method. The microwave absorption properties and possible mechanism were discussed. [Display omitted] •g-C3N4-based NiCo-alloy micro tubule first prepared through a three-step method.•g-C3N4 first used in microwave absorption.•As-prepared microwave absorber exhibits enhanced microwave absorption properties. Hollow microtubule structured nano-/micromaterials of hollow tubular g-C3N4 (TCN) enwrapped with nanosheets were fabricated by a three-step method. By calcining NiCo-layered-double-hydroxides/tubular-cyanuric acid-melamine (NiCo-LDH/TCM) precursor prepared through using 2-methylimidazole as precipitant and methanol as solvent, the as-prepared NiCo-alloy@tubular-g-C3N4 (NC@TCN) shown excellent microwave absorption in the frequency range of 2–18 GHz. The optimal reflection loss (RL) of −35.63 dB was observed at 5.00 GHz and an effective absorption bandwidth of 4.80 GHz at a matching layer thickness of 2.0 mm. Our results indicated that the deposition of NiCo-alloy nanoparticles on g-C3N4 microtubule was an efficient way to fabricate g-C3N4-based high-performance microwave absorbers.