Ohkoshi Shin-Ichi, Tsuzuo Yuna, Yoshikiyo Marie, Namai Asuka, Otake Tomu, Okuzono Kosei, Tanaka Yoshitaka, Katayama Shingo
Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
CNRS International Research Laboratory DYNACOM, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
ACS Appl Mater Interfaces. 2025 Feb 12;17(6):9523-9529. doi: 10.1021/acsami.4c17606. Epub 2025 Jan 30.
Terahertz waves are gathering attention as carrier waves for next-generation wireless communications such as sixth-generation wireless communication networks and autonomous driving systems. Electromagnetic-wave absorbers for the terahertz-wave region are necessary to ensure information security and avoid interference issues. Herein we report a high-performance terahertz-wave absorber composed of a composite of metallic λ-TiO and insulating TiO nanocrystals (λ-TiO@TiO). This material exhibits a strong terahertz-wave absorption with high values for the real (permittivity, ε') and imaginary parts (dielectric loss, ε″) of the complex dielectric constant. Furthermore, the tan(δ) (≡ ε″/ε') values are significantly high, ranging from 0.50 to 0.76 in the frequency range between 0.1 and 1 THz. An ultrathin film with a thickness of 48 μm recorded a reflection loss of -28 dB (99.8% of the terahertz wave is absorbed by the film). A terahertz-wave absorber with such a small thickness has yet to be developed. Not only does the present material exhibit resistance to heat, light, water, and organic solvents, but it can also be economically fabricated to support various applications, including outdoor uses.
太赫兹波作为下一代无线通信（如第六代无线通信网络和自动驾驶系统）的载波正受到广泛关注。太赫兹波段的电磁波吸收器对于确保信息安全和避免干扰问题是必不可少的。在此，我们报道了一种由金属λ-TiO和绝缘TiO纳米晶体（λ-TiO@TiO）的复合材料组成的高性能太赫兹波吸收器。这种材料在复介电常数的实部（介电常数，ε'）和虚部（介电损耗，ε″）方面都表现出很强的太赫兹波吸收能力，且具有很高的值。此外，tan(δ)（≡ε″/ε'）值显著较高，在0.1至1太赫兹的频率范围内为0.50至0.76。厚度为48μm的超薄膜记录的反射损耗为-28dB（99.8%的太赫兹波被该薄膜吸收）。如此薄的太赫兹波吸收器尚未被开发出来。这种材料不仅具有耐热、耐光、耐水和耐有机溶剂的特性，而且还可以经济地制造以支持各种应用，包括户外使用。
