Sintering-regulated two-dimensional plate@shell basalt@NiO heterostructure for enhanced microwave absorption
| Autor: | Yuping Duan, Xinran Ma, Huifang Pang, Jia Liu, Jingru Di |
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| Rok vydání: | 2022 |
| Předmět: |
Materials science
Non-blocking I/O General Physics and Astronomy Sintering Heterojunction Surfaces and Interfaces General Chemistry Condensed Matter Physics Surfaces Coatings and Films Vacancy defect Dielectric loss Thermal stability Composite material Absorption (electromagnetic radiation) Microwave |
| Zdroj: | Applied Surface Science. 574:151590 |
| ISSN: | 0169-4332 |
| Popis: | The heterostructure has attracted widespread attention in improving microwave absorption due to the unique composition and structure. Herein, a novel two-dimensional (2D) plate@shell basalt@NiO heterostructure is synthesized through a sequential process of water bath method followed by a sintered operation. The sintering temperature helps regulate the microwave absorption performance by controlling the heterogeneous interface and vacancy defects of basalt@NiO to optimize the dielectric loss. The RL of the prepared basalt@NiO with the sintering temperature of 300 °C reaches up to −15.93 dB at 16.13 GHz, which is attributed to the polarization loss enhanced by vacancy defects (O, Ni vacancies) introduced by low-temperature sintering and large heterogeneous contacts constructed by basalt and NiO. Meanwhile, the high concentration of vacancy defects also leads to a large electrical conductivity that positively contributes to dielectric loss. Furthermore, the basalt@NiO composite possesses relatively low density, high thermal stability and anticorrosion. This finding provides a way for designing the light microwave absorption materials with excellent environmental stability. |
| Databáze: | OpenAIRE |
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