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Shin, Tae Joo
UNIST Central Research Facilities (UCRF)
Research Interests
  • Synchrotron Radiation Application Researches

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Directed self-assembly of a helical nanofilament liquid crystal phase for use as structural color reflectors

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Title
Directed self-assembly of a helical nanofilament liquid crystal phase for use as structural color reflectors
Author
Park, WongiHa, TaewooKim, Teun-TeunZep, AnnaAhn, HyungjuShin, Tae JooSim, Kyung IkJung, Taek SunKim, Jae HoonPociecha, DamianGorecka, EwaYoon, Dong Ki
Issue Date
2019-08
Publisher
NATURE PUBLISHING GROUP
Citation
NPG ASIA MATERIALS, v.11, pp.45
Abstract
The fabrication of molecular structures with a desired morphology, e.g., nanotubes, nanoribbons, nanosprings, and sponges, is essential for the advancement of nanotechnology. Unfortunately, realization of this objective is expensive and complicated. Here, we report that irradiating a film comprising azobenzene derivatives with UV light produces oriented arrays of helical nanofilaments via the photoisomerization-induced Weigert effect. As a result, structural colors are observed due to the extrinsic chiral reflection in the visible wavelength range, and the reflected color can be tuned by adjusting the molecular length of the azobenzene derivative. This simple fabrication method can be used for fabricating large, reversible, and patternable color reflectors, providing a new platform for interference-based structural coloration as it exists in nature, such as morpho butterflies, green-winged teal, and various beetles.
URI
https://scholarworks.unist.ac.kr/handle/201301/27503
URL
https://www.nature.com/articles/s41427-019-0146-6
DOI
10.1038/s41427-019-0146-6
ISSN
1884-4049
Appears in Collections:
UCRF_Journal Papers
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