Highly Stretchable Potentiometric pH Sensor Fabricated via Laser Carbonization and Machining of Carbon−Polyaniline Composite

• DOI: 10.1021/acsami.6b16228
• Publication Date: 2017-02-22T10:26:55Z
• Authors: Rahim Rahimi; Manuel Ochoa; Ali Tamayol; Shahla Khalili; Ali Khademhosseini; Babak Ziaie
• Keywords: Biocompatibility; Thermoplastic polyurethane

The development of stretchable sensors has recently attracted considerable attention. These have been used in wearable and robotics applications, such as personalized health-monitoring, motion detection, human-machine interfaces. Herein, we report on a highly electrochemical pH sensor for point-of-care applications that consists pH-sensitive working electrode liquid-junction-free reference electrode, which the conductive interconnections are fabricated by laser carbonizing micromachining polyimide sheet bonded to an Ecoflex substrate. This method produces porous carbonized 2D serpentine traces subsequently permeated with polyaniline (PANI) filler, binding material, membrane. experimental simulation results demonstrate PANI/C-PI optimal trace width 0.3 mm can withstand elongations up 135% robust more than 12 000 stretch-and-release cycles at 20% strain without noticeable change resistance. displays linear sensitivity -53 mV/pH (r2 = 0.976) stable performance physiological range 4-10. shows excellent stability applied longitudinal transverse strains 100% different buffer solutions minimal deviation less ±4 mV. material biocompatibility is confirmed NIH 3T3 fibroblast cells via PrestoBlue assays.