Sensitive Continuous Monitoring of pH thanks to Matrix of several Suspended Gate Field Effect Transistors

摘要

Water quality becomes now a major world problem so that there is a high demand in sensitive pH-meter allowing continuous monitoring of the global quality of water. Indeed pH is a good indicator of this global quality. For example plant proliferation in water leads to pH increase. Usual glass pH-meter is more and more replaced now by Ion Sensitive Field Effect Transistors (ISFETs). Since Bergveld [1] first employed the field effect transistor in neurophysiological measurements in 1970, ISFETs have been developed into a new type of chemical sensing electrode. Many theoretical and experimental studies have been published for describing the behavior of this chemical-sensing electronic device [2,3].