A flexible and ultra-broadband terahertz wave absorber based on graphene–vertically aligned carbon nanotube hybrids
| Autor: | Zhi Kai Ng, Edwin Hang Tong Teo, Leimeng Sun, Xiao Dongyang, Qian Wang, Chun Zhao, Liang-Cheng Tu, Fangjing Hu, Minmin Zhu |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Terahertz radiation business.industry Graphene 02 engineering and technology General Chemistry Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Electromagnetic radiation Collimated light 0104 chemical sciences law.invention law Absorptance Broadband Materials Chemistry Optoelectronics 0210 nano-technology business Energy harvesting |
| Zdroj: | Journal of Materials Chemistry C. 8:7244-7252 |
| ISSN: | 2050-7534 2050-7526 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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