Before revision: History An example is the pH-sensitive LAPS that uses LEDs in combination with ( semiconducting ) silicon and pH-sensitive Ta2O5 (|SiO<sub>2|; |Si<sub>3N<sub>4|) insulator.
After revision: History An example is the pH-sensitive LAPS that uses LEDs in combination with ( semi-conducting ) silicon and pH-sensitive Ta2O5 (|SiO<sub>2|; |Si<sub>3N<sub>4|) insulator.