Before 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.
After revision: (range pH4 to pH10)History An example is the pH-sensitive LAPS that uses LEDs in combination with (semi-conducting) silicon and pH-sensitive Ta2O5 (SiO2; Si3N4) insulator.