Tunable regulation of metal-semiconductor heterostructures toward Ag/ZnO hybrids for electromagnetic wave absorption.

Metal-organic frameworks (MOFs) with tunable nano-micro structures ikhas been widely employed on developing electromagnetic wave (EMW) absorption materials (MAMs). However, the electromagnetic (EM) response and EMW absorption mechanism of heterogeneous metallic MOFs derivatives have not been systematically studied. In this work, a series of Ag/ZnO@C hybrid materials with metal-semiconductor heterostructures were prepared by using ZIF-L with adjustable cation exchange. As Zn2+ is replaced by Ag+, the structure of ZIF-L changes gradually, which determined the crystal and structure of Ag/ZnO@C hybrid materials. Finally, the minimum reflection loss (RL min) of the product obtained at 60 ℃ reached − 37.13 dB at 3.0 mm, and the maximum absorption bandwidth (f E) reached 6.8 GHz at 4.0 mm (loading content = 33 wt%). Therefore, this work can provide guidance for the design of hybrid structural MAMs by phase transformation MOFs. [Display omitted] • Ag/ZnO@C hybrid EMAs were fabricated by cation ligand exchange method on Zn-ZIF. • Phase inversion increased polarization loss while decreased conductive loss. • The f E of S3 reached 6.8 GHz, the RL min of S3 reached − 37.13 dB. [ABSTRACT FROM AUTHOR]