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Reference pH sensor, preparation and application thereof

  • US 7,727,370 B2
  • Filed: 03/03/2009
  • Issued: 06/01/2010
  • Est. Priority Date: 01/04/2006
  • Status: Expired due to Fees
First Claim
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1. A system of measuring pH value in a solution, comprising a first pH sensor which is an extended gate field effect transistor structure, comprising:

  • 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 first pH sensor and the second pH sensor 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 second 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.

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