Salt-assisted pyrolysis of carbon nanosheet and carbon nanoparticle hybrids for efficient microwave absorption. Issue 8 (8th February 2023)

• Record Type: Journal Article
• Authors: Wang, Wenjian; Ye, Weiping; Hou, Xingwang; Ran, Ke; Huang, Yilin; Zhang, Zidong; Fang, Yuan; Wang, Shuai; Zhao, Rui; Xue, Weidong
• Is Part Of: Journal of materials chemistry. Volume 11:Issue 8(2023)
• Page Start: 2941
• Page End: 2948
• Publication Date: 2023-02-08
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc04097b
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : MOF-derived carbon materials with unique structures are prepared by salt-assisted pyrolysis and exhibit excellent microwave absorbing performance with an effective absorption bandwidth of 6.23 GHz at lower fill ratios of 7%. Abstract : Metal–organic framework MOF-derived carbon materials are considered high potential candidates for electromagnetic wave absorbers. However, the rational design of MOF-derived microwave absorbing (MA) materials with stable structures and ultra-wide effective absorption bandwidth (EAB) is still challenging. Herein, a strategy for salt-assisted pyrolysis of MOFs is proposed to construct a 3D hybrid nanostructure comprising carbon nanoparticles and carbon nanosheets. The three-dimensional structure was adjusted by varying the type and proportion of salt, where NC-KCl exhibited the best microwave absorption performance, with an RLmin value of −40.58 dB and an EAB value of 6.24 GHz at a lower fill rate (7%). Numerical simulation results demonstrate that 3D hybrid nanostructures of nanoparticles and nanosheets outperform isolated nanoparticle structures in terms of interfacial polarization and conductivity loss. This work proposes a new strategy to provide a practical guide for optimizing the absorption properties of MOF-derived carbon MA materials.