Ordered TiO2 transition layer for balanced impedance-matching enabling TiO2/C/RGO porous foam low filler loading and enhanced electromagnetic wave absorption performance. (1st May 2023)

• Record Type: Journal Article
• Authors: Feng, Tong; Ren, Qingguo; Song, Zhi; Feng, Chang; Zhou, Panpan; Wang, Meng; Zhang, Qitu; Wang, Lixi
• Is Part Of: Ceramics international. Volume 49(2023)Part A
• Page Start: 14587
• Page End: 14595
• Publication Date: 2023-05-01
• Subjects: Ti3C2TxMXene -- RGO -- Porous foam structure -- Electromagnetic wave absorption; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2023.01.049
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The incoordination of attenuation capability and impedance matching due to over conductivity and single loss mechanisms severely limit the application of reduced graphene oxide (RGO) in electromagnetic wave (EMW) absorption. At this study, TiO2 /C/RGO nanocomposites are successfully fabricated by introducing monolayer Ti3 C2 Tx (m-Ti3 C2 Tx ) into RGO and building a porous foam structure. The ordered TiO2 /C layer derived from m-Ti3 C2 Tx acts as a low-dielectric transition layer, effectively optimizing the impedance matching, while the large heterogeneous interfaces composed with RGO provide more relaxation processes. The foam structure allows EMW to easily enter the interior, where scattering and refraction occur to lengthen the loss path. With only 5 wt% filler loading and a 2 mm coating thickness, the as-prepared sample has a −46.48 dB (15.92 GHz) minimum reflection loss (RLmin ), as well as an ultra-wide effective absorption bandwidth (EAB) of 5.76 GHz. In comparison, with the same filling loading, RGO barely achieves effective absorption (RL < −10 dB), while m-Ti3 C2 Tx has no EMW absorption properties at all. As a result, this work explored a practical approach for light-weight and high-performance in EMW absorption. Graphical abstract: Image 1