Rapid 3D Patterning of Poly(acrylic acid) Ionic Hydrogel for Miniature pH Sensors

Ming-Jie Yin; Mian Yao; Shaorui Gao; A Ping Zhang; Hwa-Yaw Tam; Ping-Kong A Wai

doi:10.1002/adma.201504021

Rapid 3D Patterning of Poly(acrylic acid) Ionic Hydrogel for Miniature pH Sensors

Adv Mater. 2016 Feb 17;28(7):1394-9. doi: 10.1002/adma.201504021. Epub 2015 Dec 8.

Authors

Ming-Jie Yin¹, Mian Yao^{1

2}, Shaorui Gao¹, A Ping Zhang¹, Hwa-Yaw Tam¹, Ping-Kong A Wai²

Affiliations

¹ Photonics Research Center, Department of Electrical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, SAR, China.
² Photonics Research Center, Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, SAR, China.

PMID: 26643765
DOI: 10.1002/adma.201504021

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; photopolymerization.