期刊
APPLIED SURFACE SCIENCE
卷 574, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151590
关键词
Basalt@NiO heterostructure; Vacancy defects; Heterogeneous interface; Microwave absorption
类别
资金
- National Natural Science Foundation of China [52071053, U1704253]
- National Key R&D Program of China [2017YFB0703103]
- Fundamental Research Funds for the Central Universities [DUT20GF111]
- China Postdoctoral Science Foundation [2020M670748]
In this study, a novel two-dimensional basalt@NiO heterostructure was designed and synthesized, with microwave absorption performance controlled by sintering temperature to enhance polarization loss. The composite shows good environmental stability.
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 degrees 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.
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