Enhanced electromagnetic wave absorption induced by void spaces in hollow nanoparticles. Issue 39 (1st October 2018)

• Record Type: Journal Article
• Authors: Yan, Feng; Kang, Jianyu; Zhang, Shen; Li, Chunyan; Zhu, Chunling; Zhang, Xitian; Chen, Yujin
• Is Part Of: Nanoscale. Volume 10:Issue 39(2018)
• Page Start: 18742
• Page End: 18748
• Publication Date: 2018-10-01
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c8nr07338d
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : The NiCo2 O4 hollow nanoparticles, with diameter and wall thickness of merely 10 and 2.5 nm, respectively, were anchored on the graphene surface, showing excellent electromagnetic wave absorption property. Abstract : We developed a facile method for the growth of hollow structured NiCo2 O4 nanoparticles on a graphene sheet (NiCo2 O4 -h/G). The hollow NiCo2 O4 nanoparticles have an average diameter of approximately 10.0 nm and a shell thickness of merely 2.5 nm. The NiCo2 O4 -h/G hybrid exhibited excellent electromagnetic wave absorption with minimal reflection loss below −20 dB at absorber thickness ranging from 2.0 to 5.0 mm, outperforming the solid NiCo2 O4 nanoparticles on the graphene sheet. Remarkably, even for a thickness as small as 1.5 mm, the efficient absorption bandwidth and the minimal reflection loss of the hybrid can reach 2.6 GHz and −20.3 dB, respectively. Experimental results and theoretical calculations indicate that the void space in the hollow NiCo2 O4 nanoparticles plays a crucial role in the excellent electromagnetic wave absorption property, which greatly increases the dielectric loss and impedance matching characteristics. Our results demonstrate that growing the hollow nanoparticles on a graphene sheet is an efficient way to produce high-performance electromagnetic wave absorbers.