Microscopic measurement of pH with iridium oxide microelectrodes

  title={Microscopic measurement of pH with iridium oxide microelectrodes},
  author={Wipf and Ge and Spaine and Baur},
  journal={Analytical chemistry},
  volume={72 20},
  • Wipf, Ge, +1 author Baur
  • Published 2000 in Analytical chemistry
Microscopic pH electrodes were produced by deposition of hydrous iridium oxide onto carbon fiber microelectrodes. The electrodes exhibit two linear regions of potentiometric response between pH 2-6 and pH 6-12. The electrodes respond to pH changes within 50 ms, and an equilibrium value is reached within 30 s. By using these electrodes as probes in the scanning electrochemical microscope, dynamic pH changes occurring at or near a surface can be measured and pH maps of the surface can be… CONTINUE READING