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

Wongi Park, Taewoo Ha, Teun Teun Kim, Anna Zep, Hyungju Ahn, Tae Joo Shin, Kyung Ik Sim, Taek Sun Jung, Jae Hoon Kim, Damian Pociecha, Ewa Gorecka, Dong Ki Yoon

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Article number45
JournalNPG Asia Materials
Volume11
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1

Fingerprint

Liquid Crystals
Self-assembly
Reflector
Liquid Crystal
Liquid crystals
Self assembly
Azobenzene
reflectors
self assembly
liquid crystals
Color
color
Fabrication
Derivatives
Photoisomerization
Derivative
Nanoribbons
Carbon Nanotubes
Nanotechnology
beetles

All Science Journal Classification (ASJC) codes

  • Modelling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Park, Wongi ; Ha, Taewoo ; Kim, Teun Teun ; Zep, Anna ; Ahn, Hyungju ; Shin, Tae Joo ; Sim, Kyung Ik ; Jung, Taek Sun ; Kim, Jae Hoon ; Pociecha, Damian ; Gorecka, Ewa ; Yoon, Dong Ki. / Directed self-assembly of a helical nanofilament liquid crystal phase for use as structural color reflectors. In: NPG Asia Materials. 2019 ; Vol. 11, No. 1.
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Park, W, Ha, T, Kim, TT, Zep, A, Ahn, H, Shin, TJ, Sim, KI, Jung, TS, Kim, JH, Pociecha, D, Gorecka, E & Yoon, DK 2019, 'Directed self-assembly of a helical nanofilament liquid crystal phase for use as structural color reflectors', NPG Asia Materials, vol. 11, no. 1, 45. https://doi.org/10.1038/s41427-019-0146-6

Directed self-assembly of a helical nanofilament liquid crystal phase for use as structural color reflectors. / Park, Wongi; Ha, Taewoo; Kim, Teun Teun; Zep, Anna; Ahn, Hyungju; Shin, Tae Joo; Sim, Kyung Ik; Jung, Taek Sun; Kim, Jae Hoon; Pociecha, Damian; Gorecka, Ewa; Yoon, Dong Ki.

In: NPG Asia Materials, Vol. 11, No. 1, 45, 01.12.2019.

Research output: Contribution to journalArticle

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AU - Park, Wongi

AU - Ha, Taewoo

AU - Kim, Teun Teun

AU - Zep, Anna

AU - Ahn, Hyungju

AU - Shin, Tae Joo

AU - Sim, Kyung Ik

AU - Jung, Taek Sun

AU - Kim, Jae Hoon

AU - Pociecha, Damian

AU - Gorecka, Ewa

AU - Yoon, Dong Ki

PY - 2019/12/1

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N2 - 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.

AB - 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.

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