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

Ming Jie Yin, Mian Yao, Shaorui Gao, Aping Zhang, Hwa Yaw Tam, Ping Kong Alexander Wai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

103 Citations (Scopus)


KGaA, Weinheim. 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.
Original languageEnglish
Pages (from-to)1394-1399
Number of pages6
JournalAdvanced Materials
Issue number7
Publication statusPublished - 17 Feb 2016


  • ionic hydrogels
  • optical biosensors
  • optical stereolithography
  • pH sensors
  • photopolymerization

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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