A novel electrolyte free solid state pH sensor for Bio-MEMS applications

This research work is focused on development of solid state electrolyte free pH sensor for biomedical applications. Thin films of silver - silver iodate (Ag/AgIO
₃
) and antimony oxide (Sb
₂
O
₃
) was deposited on glass substrates and successfully employed them as reference and working electrodes respectively. The structural, morphological, and electrical properties of the working and reference electrodes were investigated using X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM) and high resistance electrometer respectively. Open circuit potential was measured in a universal pH solutions. The developed sensor exhibited the sensitivity of ~ 43.1552 mV pH
^-1
. Time domain pH monitoring for continuous usage was recorded over a period of several hours and reported.