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Photoresponsive and Polarization-Sensitive Structural Colors from Cellulose/Liquid Crystal Nanophotonic Structures
KTH Royal Institute of Technology, Sweden.
Linköping University, Sweden.
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
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2021 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 33, no 36, article id 2101519Article in journal (Refereed) Published
Abstract [en]

Cellulose nanocrystals (CNCs) possess the ability to form helical periodic structures that generate structural colors. Due to the helicity, such self-assembled cellulose structures preferentially reflect left-handed circularly polarized light of certain colors, while they remain transparent to right-handed circularly polarized light. This study shows that combination with a liquid crystal enables modulation of the optical response to obtain light reflection of both handedness but with reversed spectral profiles. As a result, the nanophotonic systems provide vibrant structural colors that are tunable via the incident light polarization. The results are attributed to the liquid crystal aligning on the CNC/glucose film, to form a birefringent layer that twists the incident light polarization before interaction with the chiral cellulose nanocomposite. Using a photoresponsive liquid crystal, this effect can further be turned off by exposure to UV light, which switches the nematic liquid crystal into a nonbirefringent isotropic phase. The study highlights the potential of hybrid cellulose systems to create self-assembled yet advanced photoresponsive and polarization-tunable nanophotonics. © 2021 The Authors.

Place, publisher, year, edition, pages
John Wiley and Sons Inc , 2021. Vol. 33, no 36, article id 2101519
Keywords [en]
cellulose nanocrystals, circularly polarized light, color switching, digital color, liquid crystals, Cellulose derivatives, Circular polarization, Color, Light polarization, Light reflection, Nanocomposite films, Nanophotonics, Nematic liquid crystals, Birefringent layers, Cellulose nanocrystal (CNCs), Cellulose structures, Nanophotonic structures, Photo-responsive, Photoresponsive liquid crystals, Polarization sensitive, Cellulose
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:ri:diva-55672DOI: 10.1002/adma.202101519Scopus ID: 2-s2.0-85111138755OAI: oai:DiVA.org:ri-55672DiVA, id: diva2:1583645
Note

Funding details: Wenner-Gren Stiftelserna; Funding details: Stiftelsen för Strategisk Forskning, SSF; Funding details: Linköpings Universitet, LiU; Funding details: Knut och Alice Wallenbergs Stiftelse; Funding details: Stiftelsen Olle Engkvist Byggmästare, 194‐0679; Funding details: Wallenberg Wood Science Center, WWSC, 2009 00971; Funding text 1: P.R.A. and R.S. contributed equally to this work. P.R.A., M.P.J., and A.J.S. would like to acknowledge Stiftelsen Olle Engkvist Byggmästare (Grant No. 194‐0679) for financial support. R.S. and M.P.J. acknowledge support from the Wenner‐Gren Foundations, the Swedish Foundation for Strategic Research and the Knut and Alice Wallenberg foundation, Linköping University and industry through the Wallenberg Wood Science Center. The authors also acknowledge support from the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO‐Mat‐LiU No. 2009 00971). T. Kohne and Prof. P. Hedström are acknowledged for help with POM in reflectance mode. Idea by P.R.A. that was further elaborated together with R.S., M.P.J., and A.J.S.. Y.C. aided in the synthesis of the BMAB. A.R. aided in SEM and TEM imaging. Prof. M. Cardenás (SNSS, MaU) and H. Holzinger (KTH) are acknowledged for fruitful discussions regarding scattering technique possibilities.

Available from: 2021-08-09 Created: 2021-08-09 Last updated: 2023-05-25Bibliographically approved

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Järn, Mikael

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