Lee, Changjae Oh, Eon-Taek Park, Tae Gwan Lee, Seongeun Kim, Seon Joon Choi, Yun-Seok Rotermund, Fabian Yoon, Dong Ki 2024-06-13T02:30:28Z 2024-06-13T02:30:28Z 2024-06-13 2024-05 0008-6223 https://pubs.kist.re.kr/handle/201004/150073 Two-dimensional (2D) nanomaterials have garnered considerable attention due to their unique properties, such as thinness and excellent electronic properties. The inherent anisotropy of 2D nanomaterials, which is characterized by their high aspect ratio, can maximize the directional functionality to enhance the conductivity and utilization of edges. Here, we demonstrate how to utilize the edges of titanium carbide (Ti 3 C 2 T x ) MXene nanosheet to control the linear polarization in the terahertz (THz) frequency range. By a simple and unique vertical alignment exploiting the high surface charge and excellent colloidal dispersibility of MXene nanosheets, MXene nanosheets are vertically oriented along an applied AC electric field. The well -aligned edges justify the THz polarizing effect, revealing outstanding performances such as the broadband coverage in 0.2 - 1.5 THz and an exceptional extinction ratio reaching 20 dB. Furthermore, we vary the local orientation of the vertical MXene nanosheets by tailoring the applied electric field, enabling spatially controllable polarization capabilities. Our results can provide a generic tool for the utilization of 2D nanomaterials in diverse potential applications in optics and electronics. English Pergamon Press Ltd. Terahertz-polarizing effect based on geometric anisotropy of Ti3C2Tx MXene nanosheets Article 10.1016/j.carbon.2024.119156 1 Carbon, v.225 Carbon 225 N scie scopus 001233209800001 2-s2.0-85190757877 Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article OPTICAL-PROPERTIES CARBIDE WAVES ABSORPTION ULTRALIGHT GRAPHENE AEROGELS MXene Vertical alignment Terahertz Linear polarization