材料科学
电介质
异质结
电磁辐射
镍
硫化镍
光电子学
吸收(声学)
极化(电化学)
硫化物
相(物质)
光学
复合材料
化学
物理化学
有机化学
冶金
物理
作者
Yihao Liu,Huibin Zhang,Guanyu Chen,Xiangyu Wang,Yuetong Qian,Zhihua Wu,Wenbin You,Yi Tang,Jincang Zhang,Renchao Che
出处
期刊:Small
[Wiley]
日期:2023-11-30
标识
DOI:10.1002/smll.202308129
摘要
Engineering phase transition in micro-nanomaterials to optimize the dielectric properties and further enhance the electromagnetic microwave absorption (EMA) performance is highly desirable. However, the severe synthesis conditions restrict the design of EMA materials featuring controllable phases, which hinders the tunability of effective absorption bandwidth (EAB) and leads to an unclear loss mechanism. Herein, a seed phase decomposition-controlled strategy is proposed to induct nickel sulfide (NiSx ) absorbers with controllable phases and hollow sphere nature. Transmission electron microscopy holography and theoretical calculations evidence that the reconstruction of atoms in phase transition induces numerous heterogeneous interfaces and lattice defects/sulfur vacancies to cause varied work functions and local electronic redistribution, which contributes to reinforced dielectric polarization. As a result, the optimized NiS2 /NiS heterostructure enables enhanced EM attenuation capability with a wide EAB of 5.04 GHz at only 1.6 mm, compared to that of NiS2 and NiS. Moreover, the correlation between EAB and NiS phase content is demonstrated as the "volcano" feature. This study on the concept of phase transition of micro-nanomaterials can offer a novel approach to constructing highly efficient absorbers for EMA and other functionalities.
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