期刊
ADVANCED MATERIALS TECHNOLOGIES
卷 -, 期 -, 页码 -出版社
WILEY
DOI: 10.1002/admt.202301176
关键词
carbon nanotubes; liquid crystals; shear flow; wide-band polarizers
A large and thin conductive carbon nanotube (CNT) polarizer with high polarization efficiency has been successfully constructed using liquid crystal phase, unidirectional shearing, and drying methods. This study provides a new paradigm for realizing ultrathin and large CNT polarizers for broadband applications with outstanding heat resistance.
Aligning carbon nanotubes (CNTs) with high orientational ordering in a 2D array is essential for realizing optical polarizers with high polarization efficiency over a wide spectral range. Two methods are reported: dispersing CNTs in a polymer matrix followed by stretching, and mechanical stretching of a vertically grown CNT forest and then transferring it onto a substrate. However, neither can realize nanometer-thin or large polarizers. Herein, a novel approach is demonstrated to construct a large and thin (150 nm) conductive CNT polarizer by achieving liquid crystal (LC) phase of size-controlled CNTs in chlorosulfonic acid, unidirectional shearing, and then drying. The polarizer exhibits an excellent polarization efficiency of 98.4% for ultraviolet (365 nm) and 96.0% for visible light (550 nm). This performance is maintained even at 400 degrees C, while the conventional iodine-type polarizer starts to lose efficiency over 100 degrees C. The CNT polarizer with high polarization efficiency for UV can replace the costly nano-patterned wire-grid polarizers currently used for photoaligning LCs and also its multifunction playing role of polarizer, electrode, and LC alignment is confirmed with switching of LC device. This study provides a new paradigm for realizing ultrathin and large CNT polarizers for broadband applications with outstanding heat resistance. The carbon nanotube (CNT) polarizer prepared from liquid crystalline CNT solution has superior ordering by shear flow, revealing excellent polarization efficiency of 98.4% and 96% in UV and visible light, respectively. Moreover, the CNT polarizers present a new paradigm for polarizers by showing excellent thermal stability and multifunctionality through a simple and effective process that can be applied to a large area.image
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