硝酸ISFET型酸性雨チェッカ Nitrate-Selective Field-Effect Transistors Based Acid-Rain Checker using Phosphate Esters as Plasticizer
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Highly sensitive nitrate-selective field-effect transistors (nitrate ISFETs) were prepared by casting the FET gate insulator surface with 5 kinds of phosphate-ester based plasticizers, a nitrate-sensing material based on trihexadecyl-methylammonium nitrate and PVC matrix. The nitrate ISFETs with trioctylphosphate showed a linear response from 10<sup>-4.5</sup>3mol dm<sup>-3</sup> to 1mol dm<sup>-3</sup>. Using the most suitable nitrate-sensing membrane, we have prepared a prototype nitrate-checker composed of a nitrate ISFET and silver/silver chloride reference electrode and have demonstrated its preliminary application to real samples of rain water. We could obtain relatively good agreement of the values of nitrate concentration observed by the nitrate checker and conventional ion-chromatography and fairly good correlation coefficient between the both methods with 0.97.
- The Journal of the Institute of Electrical Engineers of Japan
The Journal of the Institute of Electrical Engineers of Japan 117(3), 165-169, 1997-03
The Institute of Electrical Engineers of Japan