Flower-like BiOI microsphere/Ni@C nanocapsule hybrid composites and their efficient microwave absorbing activity. (8th June 2018)

• Record Type: Journal Article
• Authors: Liu, Xianguo; Yu, Jieyi; Cui, Caiyun; Sun, Yuping; Li, Xiaolong; Li, Zhenxing
• Is Part Of: Journal of physics. Volume 51:Number 26(2018)
• Publication Date: 2018-06-08
• Subjects: microwave absorption -- BiOI -- Ni -- core/shell -- nanocapsules -- hybrid; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/aac7d1
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: At present, microwave absorbers are prepared by dispersing absorbing nanomaterials in a binder, which can lead to the aggregation of nanomaterials in the binder and further affect the optimization of the absorption performances. Hybrid micro/nano-scale structures are beneficial for buffering agglomeration phenomena and the construction of multiple interfaces. Here, Ni@C nanocapsules are conjugated onto flower-like BiOI microspheres, forming micro/nano-scale hybrid composites. The multiple interfaces between BiOI microspheres and Ni@C nanocapsules can bring enhanced dielectric loss and increased attenuation constant, resulting in the enhancement of absorption capacity (the optimal reflection loss reaches −61.35 dB), increased width of the effective absorption band (the maximum effective bandwidth, f Emax, is 5.86 GHz) and the reduction of absorption thickness (the thickness corresponding to f Emax is 1.7 mm). This study highlights a simple idea for the optimization of electromagnetic absorbing performance, which is of great significance in the development of microwave absorbers.