Abstract
Electromagnetic wave absorbers are essential devices in imaging, wireless communication and energy harvesting systems. In this paper, we propose and experimentally demonstrate a flexible and ultra-broadband terahertz (THz) wave absorber based on graphene-vertically aligned carbon nanotube (G-VACNT) hybrids. The THz wave absorber consists of Cu/PDMS/graphene/VACNT functional layers on a PET substrate. The measured results show a 100% qualified operating bandwidth (i.e., absorptance >0.9) and an average power absorptance of 0.986 within the 0.2-3.0 THz range. The absorber also exhibits good absorption performances for a wide range of incident angles up to 60°, and can function normally in different bending states due to its excellent flexibility. The incoming energy of THz waves absorbed by the G-VACNT hybrids results in a temperature increase whose spatial distribution is corresponding to the profile of the incident THz beam, providing an efficient and low cost approach for THz beam profiling, collimation and focusing. This work paves the way for the development of large-scale and broadband THz wave absorbers.
| Original language | English |
|---|---|
| Pages (from-to) | 7244-7252 |
| Number of pages | 9 |
| Journal | Journal of Materials Chemistry C |
| Volume | 8 |
| Issue number | 21 |
| DOIs | |
| Publication status | Published - 15 Apr 2020 |
Bibliographical note
Funding Information:This work was partially supported by the National Natural Science Foundation of China (Grant No. 61801185 and 51902112). The authors thank Kejia Wang and Runsheng Xu at the Wuhan National Laboratory for Optoelectronics at HUST for the assistance with the THz-TDS measurements.
Publisher Copyright:
© The Royal Society of Chemistry 2020.