Iridium oxide-based microelectrochemical transistors for pH sensing
1993; Elsevier BV; Volume: 12; Issue: 3 Linguagem: Inglês
10.1016/0925-4005(93)80023-5
ISSN1873-3077
AutoresK. Pásztor, Atsushi Sekiguchi, N. Shimo, Noboru Kitamura, Hiroshi Masuhara,
Tópico(s)Analytical Chemistry and Sensors
ResumoA study on electrochemically deposited iridium oxide films on Au wire and a pair of Au microelectrodes is reported. The open-circuit potential of the deposited film on an Au wire has been studied by a series of measurements. The pH sensitivity of the film is shown to be −64 to −66 mV/pH, while the relevant extrapolated potential at pH = 0 ranges from 0.67 to 0.71 V. Iridium oxide-based microelectrochemical transistors have also been fabricated. The resistance of the film on a pair of Au microelectrodes changes by 1.5 orders of magnitude from 300 to 8 MΩ as the gate voltage is stepped from −0.3 to 0.3 V. The response time of the device for chemical stimulation is less than 40 s and the device is demonstrated to be applicable as a pH sensor.
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