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Photoswitchable layer-by-layer coatings based on photochromic polynorbornenes bearing spiropyran side groups

Campos, Paula, Dunne, Aishling, Delaney, Colm orcid logoORCID: 0000-0002-4397-0133, Moloney, Cara, Moulton, Simon E., Benito-Lopez, Fernando orcid logoORCID: 0000-0001-8366-4790, Ferreira, Marystela, Diamond, Dermot orcid logoORCID: 0000-0003-2944-4839 and Florea, Larisa orcid logoORCID: 0000-0002-4704-2393 (2018) Photoswitchable layer-by-layer coatings based on photochromic polynorbornenes bearing spiropyran side groups. Langmuir, 34 (14). pp. 4210-4216. ISSN 0743-7463

Herein, we present the synthesis of linear photochromic norbornene polymers bearing spiropyran side groups (poly(SP-R)), and their assembly into LbL films on glass substrates when converted to the poly(MC-R) under UV irradiation. The LbL films were composed of bilayers of poly(allylamine hydrochloride) (PAH) and poly(MC-R), forming (PAH/poly(MC-R))n coatings. The MC form presents a significant absorption band in the visible spectral region which allowed the LbL deposition process to be tracked by UV-Vis spectroscopy, showing a linear increase of the characteristic MC absorbance band with increased number of bilayers. The thickness and morphology of the (PAH/poly(MC-R))n films were characterised by ellipsometry and Scanning Electron Microscopy, showing a height of ~27.5 nm for the first bilayer and an overall height of ~165 nm for the (PAH/poly(MC-R))5 multilayer film. Prolonged white light irradiation (22h) showed a gradual decrease of the MC band by 90.4 ±2.9% relative to the baseline, indicating the potential application of these films as coatings for photo-controlled delivery systems.
Item Type:Article (Published)
Uncontrolled Keywords:Layer-by-Layer; Spiropyran; Photo-responsive; Photochromic; Coatings
Subjects:Physical Sciences > Photochemistry
Physical Sciences > Organic chemistry
Physical Sciences > Chemistry
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Chemical Sciences
Research Institutes and Centres > INSIGHT Centre for Data Analytics
Research Institutes and Centres > National Centre for Sensor Research (NCSR)
Publisher:American Chemical Society
Official URL:https://doi.org/10.1021/acs.langmuir.8b00137
Copyright Information:© 2018 American Chemical Society
Funders:Science Foundation Ireland grant SFI/12/RC/2289, Science Foundation Ireland Technology Innovation Development Award no. 16/TIDA/4183, Ramón y Cajal Programme Ministerio de Economía y Competitividad, España. Grant No. BIO2016-80417-P.
ID Code:22311
Deposited On:12 Apr 2018 10:27 by Larisa Florea . Last Modified 30 Sep 2020 15:31

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