Advanced Materials, Vol.28, No.7, 1394-1399, 2016
Rapid 3D Patterning of Poly(acrylic acid) Ionic Hydrogel for Miniature pH Sensors
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.