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Title: Rapid 3D patterning of poly(acrylic acid) ionic hydrogel for miniature pH sensors
Authors: Yin, MJ 
Yao, M 
Gao, S 
Zhang, AP 
Tam, HY 
Wai, PKA 
Issue Date: 17-Feb-2016
Source: Advanced materials, 17 Feb. 2016, v. 28, no. 7, p. 1394-1399
Abstract: Poly(acrylic acid) (PAA), as a highly ionic conductive hydrogel, can reversibly swell/deswell according to the surrounding pH conditions. An optical maskless stereolithography technology is presented to rapidly 3D pattern PAA for device fabrication. A highly sensitive miniature pH sensor is demonstrated by in situ printing of periodic PAA micropads on a tapered optical microfiber.
Keywords: Ionic hydrogels
Optical biosensors
Optical stereolithography
pH sensors
Publisher: Wiley-VCH
Journal: Advanced materials 
ISSN: 0935-9648
EISSN: 1521-4095
DOI: 10.1002/adma.201504021
Rights: © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
This is the peer reviewed version of the following article: Yin, M. J., Yao, M., Gao, S., Zhang, A. P., Tam, H. Y., & Wai, P. K. A. (2016). Rapid 3D patterning of poly (acrylic acid) ionic hydrogel for miniature pH sensors. Advanced Materials, 28(7), 1394-1399, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
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