There are elements and principles of isfet works similar to many different mosfet voltage at terminals, gate of isfet will vary depending on the concentration of the ion of interest.
isfet elements and principles similar to the mosfet very different. The voltage of the gate electrodes isfet will vary according to the concentration of ions of interest.
ISFET composition and working principle is similar to MOSFET. Different voltage terminal gate of ISFET will change in the concentration of ions of interest.