An integrated micro multi-ion sensor using platinum-gate field-effect transistors
- 9 December 2002
- conference paper
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
Abstract
An integrated micro multi-ion sensor was designed and fabricated for a high-performance ion sensor applicable to clinical analyses. Platinum gate ISFETs (ion-sensitive field effect transistors), which have a platinum block layer for protection from ion migration and dissolution and are compatible with MOSFETs, are used. The sensor chip consists of, two kinds of ion sensors (K/sup +/ and Na/sup +/ ISFETs) and two CMOS unity-gain buffers. The output voltages are equal to the equivalent gate membrane potentials of the integrated ISFETs and show a wide linear dynamic range. The K/sup +/ and Na/sup +/ ISFETs show good chemical responses, including sensitivities, selectivities, and drifts, which are compatible with those of conventional ion-selective electrodes.<>Keywords
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