Tunneling-induced negative permittivity in Ni/MnO nanocomposites by a bio-gel derived strategy. Issue 9 (3rd February 2020)

• Record Type: Journal Article
• Authors: Xie, Peitao; Li, Yifan; Hou, Qing; Sui, Kunyan; Liu, Chunzhao; Fu, Xueyan; Zhang, Jiaoxia; Murugadoss, Vignesh; Fan, Jincheng; Wang, Yanpeng; Fan, Runhua; Guo, Zhanhu
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 9(2020)
• Page Start: 3029
• Page End: 3039
• Publication Date: 2020-02-03
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc06378a
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Tunneling-induced negative permittivity is attributed to the low frequency plasmonic state in tunneling networks, where nickel nanoparticles are still isolated geometrically but connected electrically. Abstract : One-dimensional wires are the most common building blocks in metamaterials. In this study, zero-dimensional nanoparticles connected by tunneling networks were used to construct metamaterials, thus providing a more flexible alternative for designing the geometrical configuration of metamaterials, particularly in nanodevices. The composites with nickel nanoparticles@MnO were prepared by a bio-gel derived strategy. Nickel nanoparticles were not connected geometrically, but the conductive network had been already formed, which was a tunneling-dominated percolative phenomenon demonstrated by the first-principles calculation. Negative permittivity was achieved in the composites, as the low-frequency plasmonic state could be generated in the tunneling nickel-networks. At the same time, negative susceptibility was observed due to the diamagnetism of the tunneling current loops. Electromagnetic simulations indicate that the composites have the potential for electromagnetic shielding (only 0.25 mm in thickness). It is believed that this study not only fills up the research gap in the influence of the tunneling effect on negative electromagnetic parameters but also opens up another way of preparing metamaterials by using zero-dimensional nanoparticles instead of one-dimensional wires.