Traditional microwaves absorption materials (MAMs) are applied in the form of coatings, generally inflexible, with high production costs and poor adaptability to applications in different locations. The diversification of application scenarios requires materials with multifunctionalities, but it is extremely challenging to integrate multifunctionalities within single material at present. Herein, a multifunctional CoNC@GN/PCL/TPU MAMs is synthesized. The CoNC@GN nano‐micro absorber has high‐efficiency microwave absorption ability. The electromagnetic microwave absorption performance is ultra‐light (4 wt.%), ultra‐thin (2.3 mm), and broadband (6.21 GHz), which is better than similar MAMs. Additionally, the samples have highly efficient electro‐thermal conversion properties, enabling controlled electrical heating performance and excellent self‐healing properties. More remarkably, the sample has an electrically driven shape memory effect that allows the material to target the absorption of multi‐angle incident electromagnetic waves. Therefore, CoNC@GN/PCL/TPU absorbers are the key to truly opening up opportunities for flexible, shape memory, and multifunctional absorbers in frontier applications such as wearables, deformable robots, and chip protection.
In this study, a tunable and optically transparent water-based wideband metamaterial absorber (MMA) is proposed and verified. By adjusting the thickness of the water layer, the conversion of the absorber absorption band from 7.4-22.4 GHz to 23.1-35.5 GHz can be achieved, which demonstrates the flexibility of MMA. Indium tin oxide (ITO) as the resonant and reflective layers of the material structure. Optically transparent polymethyl methacrylate (PMMA) is used as a medium container to encapsulate the water. Furthermore, the suggested MMA is polarization insensitive and has broad incident angle stability. Experiments verify the excellent properties of the proposed MMA. As a result, the suggested MMA has various applications in military and medical equipment optical windows.
At present, the sensitivity, accuracy, and stability of terahertz band bio-detection sensors still need to be improved. To meet that demand, a terahertz metamaterial bio-detection sensor was designed and fabricated by introducing a quadruple rotational symmetric microstructure, which can generate strong electromagnetic resonance. The sensor interacts with the incident terahertz wave to generate a magnetic dipole resonance, forming a resonant peak with 98.9% absorption at the resonant frequency of 0.4696 THz. When the refractive index of the analyte increased from 1.0 to 2.0, the resonance peak of the sensor obvious red-shifted, and the absorption of the resonance peak almost exceed 99%. Meanwhile, the sensitivity of the sensor can reach 78.6 GHz/RIU (Refractive index unit, RIU), Q (Quality factor, Q) is up to 55.3, and FOM (Figure of merit, FOM) is up to 9.81. In addition, the quadruple rotation structure unit makes the sensor insensitive to wide incidence angles and polarization. The designed sensor has excellent resonance characteristics and can realize the detection and identi cation of biomolecules with different refractive indices. It also provides new ideas for the design of terahertz band bio-detection sensors and has important applications in medical diagnosis and real-time monitoring.
At present, the sensitivity, accuracy, and stability of terahertz band bio-detection sensors still need to be improved. To meet that demand, a terahertz metamaterial bio-detection sensor was designed and fabricated by introducing a quadruple rotational symmetric microstructure, which can generate strong electromagnetic resonance. The sensor interacts with the incident terahertz wave to generate a magnetic dipole resonance, forming a resonant peak with 98.9% absorption at the resonant frequency of 0.4696 THz. When the refractive index of the analyte increased from 1.0 to 2.0, the resonance peak of the sensor obvious red-shifted, and the absorption of the resonance peak almost exceed 99%. Meanwhile, the sensitivity of the sensor can reach 78.6 GHz/RIU (Refractive index unit, RIU), Q (Quality factor, Q) is up to 55.3, and FOM (Figure of merit, FOM) is up to 9.81. In addition, the quadruple rotation structure unit makes the sensor insensitive to wide incidence angles and polarization. The designed sensor has excellent resonance characteristics and can realize the detection and identification of biomolecules with different refractive indices. It also provides new ideas for the design of terahertz band bio-detection sensors and has important applications in medical diagnosis and real-time monitoring.
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