Optochemical sensor and method for production

a technology of optochemical sensors and production methods, applied in the field of optochemical sensors, can solve the problems of hardly being able to detect small changes in the thickness of thin layers, and achieve the effect of reducing the difficulty of detection

Inactive Publication Date: 2001-10-16
AUSSENEGG FRANZ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

It is an object of the invention to provide an optochemical sensor of the above kind, which will permit a concentration of an analyte, such as pH value or ionic strength, to be determined in a simple a

Problems solved by technology

With conventional interferometric methods it is hardly possible,

Method used

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  • Optochemical sensor and method for production
  • Optochemical sensor and method for production

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Embodiment Construction

The optochemical sensor of FIG. 1 embodiment comprises a substrate layer 1, e.g., made of a glass wafer and a 200 nm gold coating as a mirror layer 2. Between the mirror layer 2 and a film 3 consisting of a plurality of islands 5 of electrically conductive material a reactive matrix layer 4 is situated. The matrix layer 4 is made of a material that is capable of swelling. The reactive matrix layer 4 can be derived e.g., via crosslinking reaction of polyvinylpyrrolidone with 4,4'-dazidostilbene-2,2-disulfonic acid as shown in FIG. 2.

FIG. 3 shows the influence of pH on polymer swelling and shrinking using Na.sub.2 HPO.sub.4 / NaH.sub.2 PO.sub.4 buffer (200 mM) over the pH 4.3 to 9.3 range.

FIG. 4 shows the absorbance of such a sensor at a wavelength of 720 nm due to pH induced swelling and shrinking of the reactive matrix layer over the pH 4.3 to 7.0 range.

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Abstract

An optochemical sensor for measuring concentrations of analytes is provided with a reactive matrix preferably made of polymeric material capable of swelling. Further provided are a mirror layer and a layer of a plurality of discrete islands that are electrically conductive, between which layers the reactive matrix is positioned, the diameter of the islands being smaller than the wavelength of the light employed for monitoring and evaluation.

Description

BACKGROUND OF THE INVENTIONThis invention relates to an optochemical sensor for measuring concentrations of substances by means of a reactive sensor film, and a method for preparing such an optochemical sensor.Optochemical sensors are based on the fact that a chemical reaction between the sensor material and the analyte leads to a change in the optical properties of the sensor. Such a change may involve optical properties such as absorption or fluorescence, in which instance the reaction may be detected by means of spectroscopic methods.Optochemical sensors for measuring concentrations of chemical species are met with growing interest for several reasons; compared to conventional measuring devices they are characterized by much shorter response times, greater mechanical robustness, and insensitivity to electromagnetic interferences in addition to other advantages. To ensure a short response time, however, it is essential for such optochemical sensors that the sensor material be suff...

Claims

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Application Information

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IPC IPC(8): G01N21/77G01N21/78
CPCG01N21/77G01N21/78G01N2021/7723G01N2021/773G01N2021/7779
Inventor AUSSENEGG, FRANZBRUNNER, HARALDLEITNER, ALFREDPITTNER, FRITZSCHALKHAMMER, THOMAS
Owner AUSSENEGG FRANZ
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