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Volume 4
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10.3390/micro4020024
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Article

Extending Polymer Opal Structural Color Properties into the Near-Infrared

by
Giselle Rosetta
1,2,
Matthew Gunn
1,
John J. Tomes
1,
Mike Butters
3 and
Chris E. Finlayson
1,*
1
Department of Physics, Prifysgol Aberystwyth University, Aberystwyth SY23 3BZ, UK
2
Varichem Co., Ltd., Brynmawr NP23 4BX, UK
3
Minton Treharne & Davies, Coryton, Cardiff CF14 7HY, UK
*
Author to whom correspondence should be addressed.
Micro 2024, 4(2), 387-400; https://doi.org/10.3390/micro4020024
Submission received: 24 April 2024 / Revised: 24 May 2024 / Accepted: 31 May 2024 / Published: 5 June 2024
(This article belongs to the Special Issue Advances in Micro- and Nanomaterials: Synthesis and Applications)
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Abstract

We report the fabrication and characterisation of near-IR reflecting films and coatings based on shear-assembled crystalline ensembles of polymer composite microspheres, also known as “polymer opals”. Extension of the emulsion polymerisation techniques for synthesis of tractable larger core-interlayer-shell (CIS) particles, of up to half a micron diameter, facilitates the engineering and processing of thin-film synthetic opals, with a tunable photonic stopband spanning an extended spectral range of λ ≈ 700–1600 nm. Samples exhibit strong “scattering cone” interactions, with considerable angular dependence and angle tuning possible, as measured with a goniometric technique. These intense optical resonances in the near-IR, particularly within the important region around λ ~ 800 nm, combined with an appreciable translucency within the visible light spectrum, is indicative of the potential applications in coatings technologies and solar cells.
Keywords: photonic crystals; near-infrared spectroscopy; polymer composites; micro-particles; thin-film coatings photonic crystals; near-infrared spectroscopy; polymer composites; micro-particles; thin-film coatings
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MDPI and ACS Style

Rosetta, G.; Gunn, M.; Tomes, J.J.; Butters, M.; Finlayson, C.E. Extending Polymer Opal Structural Color Properties into the Near-Infrared. Micro 2024, 4, 387-400. https://doi.org/10.3390/micro4020024

AMA Style

Rosetta G, Gunn M, Tomes JJ, Butters M, Finlayson CE. Extending Polymer Opal Structural Color Properties into the Near-Infrared. Micro. 2024; 4(2):387-400. https://doi.org/10.3390/micro4020024

Chicago/Turabian Style

Rosetta, Giselle, Matthew Gunn, John J. Tomes, Mike Butters, and Chris E. Finlayson. 2024. "Extending Polymer Opal Structural Color Properties into the Near-Infrared" Micro 4, no. 2: 387-400. https://doi.org/10.3390/micro4020024

APA Style

Rosetta, G., Gunn, M., Tomes, J. J., Butters, M., & Finlayson, C. E. (2024). Extending Polymer Opal Structural Color Properties into the Near-Infrared. Micro, 4(2), 387-400. https://doi.org/10.3390/micro4020024

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