| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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MWCNT Doped Reverse-Mode Polymer Network Liquid Crystals with Frequency Response Property |
| Jiajun Li1,2†, Dongchao Ji1†, Zhibo Zhang1,2*, Yanan Yang4, Ruicong Zhang1, Tianyu Wang2,3, Yumin Zhang1, Wenxin Cao1,2*, and Jiaqi Zhu1,2* |
1National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, China
2Zhengzhou Research Institute, Harbin Institute of Technology, Zhengzhou 450000, China
3School of Energy Science & Engineering, Harbin Institute of Technology, Harbin 150001, China
4Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials and Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
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| Cite this article: |
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Jiajun Li, Dongchao Ji, Zhibo Zhang et al 2024 Chin. Phys. Lett. 41 038501 |
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Abstract Polymer-liquid crystals (PLCs) are common materials for smart windows. However, PLC smart windows usually require high driving voltage to maintain transparency. We synthesized a novel PLC smart film by doping multi-wall carbon nanotubes (MWCNTs) into a reverse-mode polymer network liquid crystal (R-PNLC). It is found that doping MWCNTs could effectively reduce the threshold voltage ($V_{\rm th}$) of R-PNLC from 19.0 V to 8.4 V. Due to co-orientation between MWCNT and LC molecules, the doped R-PNLC is able to maintain a high transmittance of visible light ($\sim$ $80$%) without an applied electric field. We find that doping MWCNTs could change the frequency modulation property of R-PNLC. The doped R-PNLC exhibits a wider frequency modulation range up to 40000 Hz, while the frequency modulation of the undoped R-PNLC reached to a saturation at 23000 Hz. We also tested the electromagnetic interference (EMI) shielding efficiency of R-PNLC and find that the EMI shielding efficiency could be improved by doping only 0.01 wt% MWCNTs into the system. The total shielding effectiveness of 0.01 wt% MWCNT doped R-PNLC was up to 14.91 dB in the frequency band of 5.38–8.17 GHz. This study demonstrates that the films are potentially useful for low-energy-consumption smart windows with enhanced electromagnetic shielding capability.
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Received: 09 January 2024
Published: 27 March 2024
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| PACS: |
61.30.Pq
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(Microconfined liquid crystals: droplets, cylinders, randomly confined liquid crystals, polymer dispersed liquid crystals, and porous systems)
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61.30.Vx
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(Polymer liquid crystals)
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85.60.Bt
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(Optoelectronic device characterization, design, and modeling)
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85.60.-q
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(Optoelectronic devices)
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