2023-12-20 リンショーピング大学
◆導電性ポリマーとセルロースからなるこのエアロゲルは、屋外での使用に適し、水をはじき、太陽光で自然解凍できる特性を持っています。また、セルロースは低コストかつ再生可能な素材であり、エアロゲルは幅広い周波数範囲でテラヘルツ波の伝達を13％から91％まで調整できることが示されています。
＜関連情報＞
- https://liu.se/en/news-item/superlatt-material-kan-bli-nyckel-for-framtidens-terahertz-teknik
- https://onlinelibrary.wiley.com/doi/full/10.1002/advs.202305898
導電性ポリマー-セルロースエアロゲルに基づくスイッチング可能な広帯域テラヘルツ吸収体 Switchable Broadband Terahertz Absorbers Based on Conducting Polymer-Cellulose Aerogels
Chaoyang Kuang, Shangzhi Chen, Min Luo, Qilun Zhang, Xiao Sun, Shaobo Han, Qingqing Wang, Vallery Stanishev, Vanya Darakchieva, Reverant Crispin, Mats Fahlman, Dan Zhao, Qiye Wen, Magnus P. Jonsson
Advanced Science Published: 23 November 2023
DOI:https://doi.org/10.1002/advs.202305898
Abstract
Terahertz (THz) technologies provide opportunities ranging from calibration targets for satellites and telescopes to communication devices and biomedical imaging systems. A main component will be broadband THz absorbers with switchability. However, optically switchable materials in THz are scarce and their modulation is mostly available at narrow bandwidths. Realizing materials with large and broadband modulation in absorption or transmission forms a critical challenge. This study demonstrates that conducting polymer-cellulose aerogels can provide modulation of broadband THz light with large modulation range from ≈ 13% to 91% absolute transmission, while maintaining specular reflection loss < −30 dB. The exceptional THz modulation is associated with the anomalous optical conductivity peak of conducting polymers, which enhances the absorption in its oxidized state. The study also demonstrates the possibility to reduce the surface hydrophilicity by simple chemical modifications, and shows that broadband absorption of the aerogels at optical frequencies enables de-frosting by solar-induced heating. These low-cost, aqueous solution-processable, sustainable, and bio-friendly aerogels may find use in next-generation intelligent THz devices.
