REFERENCE PH SENSOR, PREPARATION AND APPLICATION THEREOF
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Abstract
A reference pH sensor, the preparation and application thereof. The reference pH sensor is an extended gate field effect transistor (EGFET) structure and comprises a metal oxide semiconductor field effect transistor (MOSFET) on a semiconductor substrate, a sensing unit comprising a substrate, a solid-state conductive sensing layer on the substrate, and a polypyrrole layer on the solid-state conductive sensing layer, and a metal wire connecting the MOSFET and the sensing unit.
15 Citations
28 Claims
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1-20. -20. (canceled)
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21. A system of measuring pH value in a solution, comprising a first pH sensor which is an extended gate field effect transistor structure, comprising:
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a first metal oxide semiconductor field effect transistor (MOSFET); a first extended gate as a first sensing unit, comprising a first substrate, and a first solid-state conductive layer thereon; and a first conductive wire connecting the first MOSFET and the first sensing unit. a second pH sensor as a reference pH sensor supplying stable voltage, comprising; a second metal oxide semiconductor field effect transistor (MOSFET); a second extended gate as a second sensing unit, comprising a second substrate, a second solid-state conductive layer thereon, and a polypyrrole layer on the second solid-state conductive layer; and a second conductive wire connecting the second MOSFET and the second sensing unit; a semiconductor characteristic instrument connecting the pH sensor and the reference electrode respectively; a temperature controller comprising a temperature control center, a thermocouple, and a heater, wherein the temperature control center connects the thermocouple and the heater, respectively; and a light-isolation container isolating the sensing unit of the pH sensor from photosensitive effect; wherein measurement of pH value of a solution comprising; pouring a solution into the light-isolation container; immersing the sensing unit of the first and the second pH sensors, and the thermocouple in the solution; adjusting temperature of the solution by the heater controlled by the temperature control center after detecting temperature variation in the solution by the thermocouple; transmitting measurement data from the first and the second pH sensors to the semiconductor characteristic instrument; and reading out current-voltage (I-V) values of the solution by the semiconductor characteristic instrument to obtain pH value of the solution. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification