Ion-selective CHEMFET sensors

Ion-selective CHEMFET sensors are based on Ion Sensitive Field Effect Transistors (ISFET). Their fabrication with microelectronic technologies offers advantages like robustness, small size and low cost compared to standard ion-selective electrodes.

MEMFETs with ion-sensitivity and selectivity to different ionic species are obtained by depositing polymeric membranes containing specific receptor molecules on the gate surface.

Detail of ISFET/CHEMFET Sensors

Sensors sensibity to 

  • Na+
  • K+
  • NH4+
  • Ca2+
  • Cl-

                           K and Ca-ISFET



  • Membranes based on polyurethane diacrylates (photosensitive polymer).
  • Durable (> 5 months).
  • Deposited and patterned by photolitographic techniques.
  • Polymers compatible with almost all ionophores and plasticizers used for ISE technology.

Device features

  • Small size, adaptable to miniaturized systems.
  • Robustness due to non-glass and solid state nature.
  • Response time up to 10 times faster than ISEs.
  • High long-term stability.
  • High reproducibility.
  • Low impedance output signal.
  • Low cost (mass production).
  • Stores dry, no maintenance required.

Más Información

Dr. Carlos Domínguez Horna
Campus UAB
08193 Bellaterra (España)
Tel.: 93-590-33-95

Mr. Humberto Mata
D+T Microelectrónica
Campus UAB
E-08193 Bellaterra (España)
Tel.: 93-594-77-00