研究目的
To propose and experimentally demonstrate a flexible and ultra-broadband terahertz (THz) wave absorber based on graphene-vertically aligned carbon nanotube (G-VACNT) hybrids.
研究成果
The proposed THz absorber based on G-VACNT hybrids exhibits excellent absorption performance within the 0.2-3.0 THz region, is flexible, and can function normally for a wide range of incident angles and bending states. It provides an efficient approach for THz beam profiling, collimation, and focusing, paving the way for large-scale and broadband THz wave absorbers.
研究不足
The absorption performance is dependent on the thickness of the VACNT layer, and the fabrication process is complex. The thermal time constant of VACNTs limits the dynamic response for bolometric imaging applications.
1：Experimental Design and Method Selection:
The design employs the complementary THz wave absorption characteristics of graphene and VACNT, with Cu/PDMS/graphene/VACNT functional layers on PET substrate.
2：Sample Selection and Data Sources:
Samples with different VACNT thicknesses (50, 100, and 200 μm) were fabricated and measured.
3：List of Experimental Equipment and Materials:
Includes thermal chemical vapor deposition (TCVD) system for graphene and VACNT growth, Zomega Z3 model for THz-TDS measurements, and FLIR T650sc thermal camera for temperature profiling.
4：Experimental Procedures and Operational Workflow:
Detailed steps include graphene transfer, VACNT growth and transfer, and characterization using SEM and Raman spectroscopy.
5：Data Analysis Methods:
Power absorptance was calculated from THz-TDS measurements, and thermal imaging was used to analyze THz-to-IR conversion.
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