Ultra‐Broadband Wide‐Angle Terahertz Absorption Properties of 3D Graphene Foam

Abstract

As a next generation of detection technology, terahertz technology is very promising. In this work, a highly efficient terahertz wave absorber based on 3D graphene foam (3DG) is first reported. Excellent terahertz absorption property at frequency ranging from 0.1 to 1.2 THz is obtained owing to faint surface reflection and enormous internal absorption. By precise control of the constant properties for 3DG, the reflection loss (RL) value of 19 dB is acquired and the qualified frequency bandwidth (with RL value over 10 dB) covers 95% of the entire measured bandwidth at normal incidence, which far surpasses most reported materials. More importantly, the terahertz absorption performance of 3DG enhances obviously with increasing the incidence while majority of materials become invalid at oblique incidence, instead. At the incidence of 45°, the maximum RL value increases 50% from 19 to 28.6 dB and the qualified frequency bandwidth covers 100% of the measured bandwidth. After considering all core indicators involving density, qualified bandwidth, and RL values, the specific average terahertz absorption (SATA) property is investigated. The SATA value of 3DG is over 3000 times higher than those of other materials in open literatures.

Compressible Highly Stable 3D Porous MXene/GO Foam with a Tunable High-Performance Stealth Property in the Terahertz Band

“…It is obvious that the thickness and the MXene content are crucial to the terahertz stealth performance of MGOF. In our previous works, it was demonstrated that GO foam without any treatment exhibits a very inferior terahertz absorption ability (the average RL loss value is approximately 1 dB with a thickness of 4 mm) because of the severe disruption of in-plane conjugated structures . In this work (shown in Figure b–e), with the addition of MXene that has a high electromagnetic response to the GO foam, the absorptive property is greatly improved compared to the pure GO foam without any posttreatment.…”

“…In our previous works, it was demonstrated that GO foam without any treatment exhibits a very inferior terahertz absorption ability (the average RL loss value is approximately 1 dB with a thickness of 4 mm) because of the severe disruption of in-plane conjugated structures. 22 In this work (shown in Figure 4b−e), with the addition of MXene that has a high electromagnetic response to the GO foam, the absorptive property is greatly improved compared to the pure GO foam without any posttreatment. In addition, the absorptivity of MGOF with different thicknesses (1−4 mm) exhibits a gradient growth with an increase in the content of MXene nanosheets at a low load of MXene.…”

Electrostatically Self‐Assembled MXene@CIP for Structural Functional Absorber Spanning Microwave to Terahertz Bands

“…As shown in Figure 4h and Table S1, the MCRC sample achieves an ideal ultra‐broadband low‐reflection absorption performance across the 7.95–4000 GHz. Both its EAB and RL min surpass those of most previously reported absorbers [33, 53–61], while simultaneously exhibiting lower RL and a thinner matching thickness. These advantages highlight MCRC as a promising solution for cross‐band electromagnetic compatibility applications.…”

Multifunctional MXene-based composite films with simultaneous terahertz/gigahertz wave shielding performance for future 6G communication

“…4g), our M/A films demonstrate great superiority in both THz shielding efficiency and low thickness. 5,53,55,58–60 In fact, the SE values of M/A films are higher than those reported materials, with a lower thickness of several orders. This ideal THz shielding performance obtained by M/A-films can be attributed to both its intrinsic high conductivity (Fig.…”