Rational construction of hierarchical hollow CuS@CoS2 nanoboxes with heterogeneous interfaces for high-efficiency microwave absorption materials

By Panbo Liu, Sai Gao, Xudong Liu, Ying Huang, Wenjuan He, Yanting Li. 2020

254 citations recorded by the source corpus.

Abstract Hierarchical hollow structures have received considerable attention for light weight microwave absorption materials, however, constructing and regulating hollow structures with heterogeneous interfaces still remains a great challenge. In this work, hierarchical hollow CuS@CoS2 nanoboxes with double shells have been designed by a template-assisted process inspired by Pearson's hard and soft acid-base principle, in which the hollow nanoboxes are composed of CuS inner shell and CoS2 nanosheets outer shell. The formation of outer Co(OH)2 nanosheets is a key factor to achieve the double shells via a “coordinating etching and precipitating” route and the etching of cubic Cu2O precursor plays an important role to stabilize the hollow nanoboxes. As absorbers, the hierarchical hollow nanoboxes exhibit high-efficiency microwave absorption attenuation because of the synergistic effects of dipolar and interfacial polarizations, multiple scatterings, hollow/core-shell structures and matched impedance. Typically, the minimum reflection loss is up to −58.6 dB at 2.5 mm when the filler loading is 20 wt% and the absorption bandwidth exceeding −10 dB is 8.2 GHz at 2.2 mm with 30 wt% filler loading. Consequently, this strategy offers a unique thought for the construction of hollow nanoboxes with double shells and the as-fabricated nanoboxes can be used as a promising candidate for microwave absorption materials with light weight and high-efficiency.

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/f94b473ee954aeb2c4a78be76e12d1f12d374fe5