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Poly(vinyl alcohol) rehydratable photonic crystal sensor materials

Ward Muscatello, MM and Asher, SA (2008) Poly(vinyl alcohol) rehydratable photonic crystal sensor materials. Advanced Functional Materials, 18 (8). 1186 - 1193. ISSN 1616-301X

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We developed a new photonic crystal hydrogel material based on the biocompatible polymer poly (vinyl alcohol) (PVA), which can be reversibly dehydrated and rehydrated, without the use of additional fillers, while retaining the diffraction and swelling properties of polymerized crystalline colloidal arrays (PCCA). This chemically modified PVA hydrogel photonic crystal efficiently diffracts light from the embedded crystalline colloidal array. This diffraction optically reports on volume changes occurring in the hydrogel by shifts in the wavelength of the diffracted light. We fabricated a pH sensor, which demonstrates a 350 nm wavelength shift between pH values of 3.3 and 8.5. We have also fabricated a Pb+2 sensor, in which pendant crown ether groups bind lead ions. Immobilization of the ions within the hydrogel increases the osmotic pressure due to the formation of a Donnan potential, swelling the hydrogel and shifting the observed diffraction in proportion to the concentration of bound ions. The sensing responses of rehydrated PVA pH and Pb+2 sensors were similar to that before drying. This reversibility of rehydration enables storage of these hydrogel photonic crystal sensors in the dry state, which makes them much more useful for commercial applications. © 2008 WILEY-VCH Verlag GmbH & Co. KGaA.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Ward Muscatello, MM
Asher, SAasher@pitt.eduASHER
Date: 25 April 2008
Date Type: Publication
Journal or Publication Title: Advanced Functional Materials
Volume: 18
Number: 8
Page Range: 1186 - 1193
DOI or Unique Handle: 10.1002/adfm.200701210
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 1616-301X
PubMed Central ID: PMC3111221
PubMed ID: 21666875
Date Deposited: 21 Feb 2013 22:35
Last Modified: 22 Jun 2021 13:55


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