Photoelectric chemical sensor and sensing method utilizing interfacial photo-voltages
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United States of America Patent
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Jan 15, 2013
Grant Date -
Nov 13, 2008
app pub date -
Apr 7, 2008
filing date -
Nov 8, 2000
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Abstract
A device and method which comprises a sensing surface on a membrane, solid surface or electrode, where the sensing surface contains a photo-voltage active material chosen in relation to a particular target substance to be detected and quantified. The photo-voltage active material is of a type which produces an interfacial photo-voltage electrical signal upon illumination. The particular photo-voltage active material chosen for a particular target substance is one in which the presence of the target substance causes a change in the electrical signal produced. The presence of the target substance modifies the expected photo-voltage produced by the sensing surface upon illumination. The photo-voltage produces signals which are detected by electronic circuits, and the presence and concentration of the target substance is determined by analyzing the difference between the photo-voltage of the target sample versus the photo-voltage of a control sample lacking the target substance.
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