Multilevel Heterogeneous Interfaces Enhanced Polarization Loss of 3D-Printed Graphene/NiCoO2/Selenides Aerogels for Boosting Electromagnetic Energy Dissipation

时间:2024-04-02浏览:15

论文题目:Multilevel Heterogeneous Interfaces Enhanced Polarization Loss of 3D-Printed Graphene/NiCoO2/Selenides Aerogels for Boosting Electromagnetic Energy Dissipation

论文作者:Xiao-Yan Liu, Wen-Le Ma*, Tian-Yue Yang, Zheng-Rong Qiu, Jian-Bin Wang, Yu-Hao Li, Yang Wang, Yi Huang*

发表期刊:https://doi.org/10.1021/acsnano.4c00193

Abstract

Heterointerface engineering is an attractive approach to modulating  electromagnetic (EM) parameters and EM wave absorption performance.  However, the weak interfacial interactions and poor impedance matching  would lead to unsatisfactory EM absorption performance due to the  limitation of the construction materials and design strategies. Herein,  multilevel heterointerface engineering is proposed by in situ growing  nanosheet-like NiCoO2 and selenides with abundant interface  structures on 3D-printed graphene aerogel (GA) skeletons, which  strengthens the interfacial effect and improves the dielectric  polarization loss. Benefiting from the features of substantially  enhanced polarization loss and optimized impedance matching, the  graphene/S-NiCoO2/selenides (G/S-NCO/Se) have achieved  brilliant EM wave absorption performance with a strong reflection loss  (RL) value of −60.7 dB and a broad effective absorption bandwidth (EAB)  of 8 GHz, which is about six times greater than that of the graphene  aerogel (−9.8 dB). Moreover, it is further confirmed by charge density  differences and off-axis electron holography that a large amount of  polarized charge accumulates at the interface, leading to significant  polarization relaxation behaviors. This work provides a deep  understanding of the effect of a multilevel heterogeneous interface on  dielectric polarization loss, which injects a fresh and infinite  vitality for designing high-efficiency EM wave absorbers.