Before revision: History An example is the pH-sensitive LAPS that uses LEDs in combination with (semi-conducting) silicon and pH-sensitive Ta2O5 ([SiO2 |SiO2 ];[ Si3N4| Si3N4]) insulator.
After revision: History An example is the pH-sensitive LAPS that uses LEDs in combination with (semi-conducting) silicon and pH-sensitive Ta2O5 ([SiO2 ];[ Si3N4]) insulator.