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Article

Fluorescence Modulation of Conjugated Polymer Nanoparticles Embedded in Poly(N-Isopropylacrylamide) Hydrogel

Organic and Optoelectronic Materials Laboratory, Department of Organic Materials Engineering, Chungnam National University, Daejeon 34134, Korea
*
Author to whom correspondence should be addressed.
These authors contributed equally.
Academic Editor: Dong Jin Yoo
Polymers 2021, 13(24), 4315; https://doi.org/10.3390/polym13244315
Received: 28 September 2021 / Revised: 3 December 2021 / Accepted: 8 December 2021 / Published: 9 December 2021
(This article belongs to the Collection Innovative Functional Textiles)
A series of conjugated polymers (CPs) emitting red, green, and blue (RGB) fluorescence were synthesized via the Suzuki coupling polymerization. Polymer dots (Pdots) were fabricated by the reprecipitation method from corresponding CPs, in which the Pdot surface was functionalized to have an allyl moiety. The CP backbones were based on the phenylene group, causing the Pdots to show identical ultraviolet-visible absorption at 350 nm, indicating that the same excitation wavelength could be used. The Pdots were covalently embedded in poly(N-isopropylacrylamide) (PNIPAM) hydrogel for further use as a thermoresponsive moiety in the polymer hydrogel. The polymer hydrogel with RGB emission colors could provide thermally reversible fluorescence changes. The size of the hydrogel varied with temperature change because of the PNIPAM’s shrinking and swelling. The swollen and contracted conformations of the Pdot-embedded PNIPAM enabled on-and-off fluorescence, respectively. Fluorescence modulation with 20 to 80% of the hydrogel was possible via thermoreversibility. The fluorescent hydrogel could be a new fluorescence-tuning hybrid material that changes with temperature. View Full-Text
Keywords: conjugated polymer dots; PNIPAM; thermoreversible fluorescence; hydrogel conjugated polymer dots; PNIPAM; thermoreversible fluorescence; hydrogel
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MDPI and ACS Style

Namgung, H.; Jo, S.; Lee, T.S. Fluorescence Modulation of Conjugated Polymer Nanoparticles Embedded in Poly(N-Isopropylacrylamide) Hydrogel. Polymers 2021, 13, 4315. https://doi.org/10.3390/polym13244315

AMA Style

Namgung H, Jo S, Lee TS. Fluorescence Modulation of Conjugated Polymer Nanoparticles Embedded in Poly(N-Isopropylacrylamide) Hydrogel. Polymers. 2021; 13(24):4315. https://doi.org/10.3390/polym13244315

Chicago/Turabian Style

Namgung, Ho, Seonyoung Jo, and Taek S. Lee. 2021. "Fluorescence Modulation of Conjugated Polymer Nanoparticles Embedded in Poly(N-Isopropylacrylamide) Hydrogel" Polymers 13, no. 24: 4315. https://doi.org/10.3390/polym13244315

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