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Wang S, Hao X, Liu Y, Cheng Z, Chen S, Peng G, Tao J, Yao J, Yang F, Zhou J. Intelligent Tunable Wave-Absorbing CNTs/VO 2/ANF Composite Aerogels Based on Temperature-Driving. ACS APPLIED MATERIALS & INTERFACES 2024; 16:32773-32783. [PMID: 38865582 DOI: 10.1021/acsami.4c06980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2024]
Abstract
The development of new electromagnetic absorbing materials is the main strategy to address electromagnetic radiation. Once traditional electromagnetic wave-absorbing materials are prepared, it is difficult to dynamically change their electromagnetic wave-absorbing performance. Facing the complexity of the information age and the rapid development of modern radar, it is significant to develop intelligent modulation of electromagnetic wave-absorbing materials. Here, CNTs/VO2/ANF composite aerogels with dynamic frequency tunability and switchable absorption on/off were synthesized. Based on the phase change behavior of VO2, the degree of polarization and interfacial effects of multiple heterogeneous interfaces between VO2 and CNTs and aramid nanofibers (ANFs) were modulated at different temperatures. With the increase in temperature (from 25 to 200 °C), the maximum absorption frequency of the frequency tunable aerogel is modulated from 12.24 to 8.56 GHz in the X-band, and the absorption intensity remains stable. The maximum effective switching bandwidth (ΔEAB) of the wave-absorbing switchable aerogel is 3.70 GHz. This study provides insights into intelligent electromagnetic wave absorption performance and paves the way for temperature-driven application of intelligent modulation of electromagnetic absorbers.
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Affiliation(s)
- Shunan Wang
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing, Jiangsu 210016, China
| | - Xiuqing Hao
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing, Jiangsu 210016, China
| | - Yijie Liu
- College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China
- Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics), Ministry of Industry and Information Technology, Nanjing 211100, China
| | - Zhenyu Cheng
- College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China
- Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics), Ministry of Industry and Information Technology, Nanjing 211100, China
| | - Simin Chen
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing, Jiangsu 210016, China
| | - Guiyu Peng
- College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China
- Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics), Ministry of Industry and Information Technology, Nanjing 211100, China
| | - Jiaqi Tao
- College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China
- Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics), Ministry of Industry and Information Technology, Nanjing 211100, China
| | - Junru Yao
- College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China
- Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics), Ministry of Industry and Information Technology, Nanjing 211100, China
| | - Feng Yang
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Jintang Zhou
- College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China
- Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics), Ministry of Industry and Information Technology, Nanjing 211100, China
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Zhu C, Shao Y, Ma S, Chen J, Chen X, Wang X, Luo Y. Polarization-independent and reciprocity-unbroken multifunctional device with composite symmetrical structure. OPTICS EXPRESS 2023; 31:23563-23578. [PMID: 37475437 DOI: 10.1364/oe.492145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 06/09/2023] [Indexed: 07/22/2023]
Abstract
A design method for a dynamically tunable multifunctional device, which is insensitive to polarization while maintaining unbroken reciprocity, is proposed. The device utilizes a multilayer composite symmetrical structure incorporating vanadium dioxide (VO2). This design enables dynamic switching among the functions of linear polarization conversion, filtering, and absorption. In the polarization conversion state, the device achieves orthogonal deflection of incident waves at any polarization angle, with a polarization conversion ratio (PCR) exceeding 95%. When switched to the filtering function, a band-stop filter with a -20 dB bandwidth of 0.56 THz is obtained. In the absorption function, the device exhibits a peak absorption efficiency of up to 99%. Furthermore, the paper discusses the potential for a dual-band device based on the proposed structure. The device maintains reciprocity in all functions and effectively handles incident waves from both positive and negative directions. This adaptability and flexibility make it suitable for various applications, including switches, sensors, and modulators.
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Wang Y, Xuan X, Wu S, Zhu L, Zhu J, Shen X, Zhang Z, Hu C. Reverse design of metamaterial absorbers based on an equivalent circuit. Phys Chem Chem Phys 2022; 24:20390-20399. [PMID: 35983852 DOI: 10.1039/d2cp01626e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present a reverse design method useful for designing and analyzing metamaterial absorbers; we demonstrate its power by designing both a narrowband absorber and a wideband absorber. The method determines the structure of the absorber using an equivalent-circuit model. The narrowband metamaterial absorber structures were based on the equivalent-circuit model, and the narrowband metamaterial absorber designed using the method has an absorption fraction greater than 90% in a bandwidth of 500 nm centered at about 1450 nm. In order to extend the absorption bandwidth for the absorber, the narrowband absorber structure is adjusted based on the equivalent-circuit model, and the broadband metamaterial absorber structure is investigated. The numerical results show that the absorption bandwidth is substantially increased; the absorbance is greater than 90% for a band nearly reaching the limits of our experiment, from about 400 nm (near-ultraviolet) to about 2800 nm (deep infrared). The absorption spectrum of the wideband absorber is more sensitive to the angle of incident polarization due to the asymmetric structure, but the whole band shows polarization independence. For a large angle of 60° (TM polarization) oblique incidence, the average absorption of the broadband metamaterial absorber reaches 81%. The physical mechanism of the wideband high absorption is analyzed, which is mainly caused by Fabry-Perot resonance, surface plasmon resonance, local surface plasmon resonance, and the hybrid coupling among them. Our proposed design with high-broadband absorption has significant potential for thermoelectric and thermal emitters, solar thermal energy harvesting, and invisible device applications.
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Affiliation(s)
- Yang Wang
- School of Electronic Engineering, Huainan Normal University, Huainan 232000, China.
| | - Xuefei Xuan
- School of Electronic Engineering, Huainan Normal University, Huainan 232000, China.
| | - Shenbing Wu
- School of Electronic Engineering, Huainan Normal University, Huainan 232000, China.
| | - Lu Zhu
- School of Information Engineering, East China Jiaotong University, Nanchang 330013, China.
| | - Jiabing Zhu
- School of Electronic Engineering, Huainan Normal University, Huainan 232000, China.
| | - Xiaobo Shen
- School of Electronic Engineering, Huainan Normal University, Huainan 232000, China.
| | - Zhipeng Zhang
- School of Electronic Engineering, Huainan Normal University, Huainan 232000, China.
| | - Changjun Hu
- School of Electronic Engineering, Huainan Normal University, Huainan 232000, China.
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