In Situ Dual-Template Method of Synthesis of Inverse-Opal Co3O4@TiO2 with Wideband Microwave Absorption

Chengwei Zhang; Yue Peng; Tieliang Zhang; Weibing Guo; Ye Yuan; Yibin Li

doi:10.1021/acs.inorgchem.1c03035

In Situ Dual-Template Method of Synthesis of Inverse-Opal Co₃O₄@TiO₂ with Wideband Microwave Absorption

Inorg Chem. 2021 Dec 6;60(23):18455-18465. doi: 10.1021/acs.inorgchem.1c03035. Epub 2021 Nov 20.

Authors

Chengwei Zhang¹, Yue Peng¹, Tieliang Zhang², Weibing Guo¹, Ye Yuan¹, Yibin Li³

Affiliations

¹ School of Materials Science & Engineering, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, People's Republic of China.
² Shenyang Aircraft Design and Research Institute, Aviation Industry Corporation of China, Shenyang 110035, People's Republic of China.
³ School of Materials Science and Engineering, Beihang University, Beijing 100191, People's Republic of China.

PMID: 34806378
DOI: 10.1021/acs.inorgchem.1c03035

Abstract

A unique porous TiO₂ with Co₃O₄ nanoparticles anchored in (Co₃O₄@TiO₂) is prepared by a dual-templating method for promoting electromagnetic microwave absorption (EMA). The as-prepared Co₃O₄@TiO₂ possesses a three-dimensional (3D) ordered macroporous TiO₂ skeleton and plenty of mesopores, as well as small Co₃O₄ nanoparticles that coexisted in the macropore walls of the TiO₂ skeleton. The introduction of Co₃O₄ can increase the magnetic loss as well as suppress impedance mismatch, resulting in the regulation of the EMA performance. The synergetic effect of the TiO₂ porous framework and Co₃O₄ nanoparticles with proper ratio promote microwave absorption performance. Therefore, Co₃O₄@TiO₂-2 with 25 wt % Co₃O₄ nanoparticles content displays a strong and ultrawide effective absorption band (EAB) performance. The Co₃O₄@TiO₂-2 presents a strong reflection loss of -53.9 dB at 2.95 mm. Moreover, it obtains a super broad EAB of ∼12.5 GHz at 5.0 mm. This dual-templating approach for a well-controlled porous structure could be a facial strategy for the development of high-performance electromagnetic wave absorbers.