PH meter and sensor thereof
First Claim
Patent Images
1. A pH sensor, comprising:
- conductive glass;
a SnO2 film formed on the conductive glass; and
a field effect transistor with a gate coupled to the SnO2 film;
wherein the SnO2 film contacts a liquid with a predetermined voltage to generate a voltage difference therebetween, the pH sensor determining pH of the liquid according to a linear relationship between channel current of the field effect transistor and the voltage difference.
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Abstract
A pH sensor is disclosed, including conductive glass, a SnO2 film formed on the conductive glass, and a field effect transistor (FET) with a gate coupled to the SnO2 film. When the SnO2 film contacts a liquid with a predetermined voltage, voltage between the liquid and the SnO2 film varies according to pH of the liquid, thereby changing channel current of the FET. The pH of the liquid can thus be determined according to the channel current.
6 Citations
15 Claims
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1. A pH sensor, comprising:
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conductive glass; a SnO2 film formed on the conductive glass; and a field effect transistor with a gate coupled to the SnO2 film; wherein the SnO2 film contacts a liquid with a predetermined voltage to generate a voltage difference therebetween, the pH sensor determining pH of the liquid according to a linear relationship between channel current of the field effect transistor and the voltage difference. - View Dependent Claims (2, 3)
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4. A chemical sensing platform for detecting pH of a liquid, comprising:
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a reference electrode in the liquid, providing a stable voltage; and at least one pH sensor, comprising; conductive glass; a SnO2 film formed on the conductive glass; and a field effect transistor with a gate coupled to the SnO2 film; wherein the SnO2 film contacts a liquid with a predetermined voltage to generate a voltage difference between the liquid and the SnO2 film, the pH sensor determining pH of the liquid according to a linear relationship between channel current of the field effect transistor and the voltage difference. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification