WO1996039624A1 - Ph-sensitiver mikrosensor, sowie verfahren zu seiner herstellung - Google Patents
Ph-sensitiver mikrosensor, sowie verfahren zu seiner herstellung Download PDFInfo
- Publication number
- WO1996039624A1 WO1996039624A1 PCT/DE1996/001021 DE9601021W WO9639624A1 WO 1996039624 A1 WO1996039624 A1 WO 1996039624A1 DE 9601021 W DE9601021 W DE 9601021W WO 9639624 A1 WO9639624 A1 WO 9639624A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- sensitive
- microsensor
- sensor membrane
- membrane
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/333—Ion-selective electrodes or membranes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/327—Biochemical electrodes, e.g. electrical or mechanical details for in vitro measurements
- G01N27/3271—Amperometric enzyme electrodes for analytes in body fluids, e.g. glucose in blood
Definitions
- pH-sensitive microsensor pH-sensitive microsensor and method for its production
- the invention relates to a pH-sensitive microsensor based on silicon according to the preamble of claim 1. Furthermore, the invention relates to a method for its production according to the preamble of claim 4.
- ISFET ion-sensitive field effect transistors
- the basic structure of which corresponds to a conventional MOSFET instead of the metallic gate electrode, such a component has a combination of a sensitive layer (sensor membrane), electrolyte and reference electrode.
- a sensitive layer sensor membrane
- electrolyte electrolyte
- reference electrode for example, C. Cui et al. , An experimental study of inorganic gate ISFETS, Sensors and Actuators B, 1 (1990), p. 421, instead of a complete ISFET also using capacitive field effect structures which correspond in structure to the gate area of an ISFET as pH sensors.
- this sensor membrane consists, for example, of Si 3 N 4 , Ta 2 0 5 or also Al 2 0 3 .
- the sensor membrane is formed, in particular when Al 2 0 3 is selected, by means of sputtering technology or chemical vapor deposition (CVD).
- a disadvantage of the known microsensors containing such sensor membranes is the relatively high drift rates.
- the object is achieved by a microsensor according to the entirety of the features according to claim 1.
- the object is further achieved by a method according to the The entirety of the features according to claim 4. Further expedient or advantageous embodiments or variants can be found in the subclaims which refer back to one of these claims.
- the characteristics with regard to the sensor properties for the sensor according to the invention are comparable or even better with the known sensors.
- the drift rate of the sensor according to the invention is considerably reduced in comparison with the known sensors. While the sensors manufactured with sputter technology or CVD have a drift rate of at least 5 to 10 mV per day, as for example from IEEE Trans, on Electron Dev., Vol. Ed-26, No. 12, December 1979, p. 1939 ff., The sensor according to the invention shows a drift rate of, for example, only 1.0 mVolt per day or better.
- the microsensor according to the invention can be used as a chemical pH sensor.
- a biochemical sensor can also be formed on the basis thereof.
- a biosensitive layer can be formed on the sensor membrane, for example from an enzyme.
- the biosensitive sensor has the advantages mentioned above for the microsensor, in particular with regard to the lower drift rate.
- the micro- or biosensor can optionally be re-annealed in an oxygen atmosphere during production after formation of the membrane.
- Fig. 1 Micro or biosensor according to the invention
- the micro or biosensor according to the invention is shown in FIG.
- an insulating SiO 2 layer 2 (with a thickness in the range of 30-100 nm, for example) was successively placed on a substrate 1 made of p-doped silicon (with a concentration of, for example, 5 * 10 p / cm and a substrate thickness of 400 ⁇ m) ) and the sensor membrane 3 made of Al 2 0 3 and formed in this way.
- layer 3 shown in FIG. 1 is to be understood as a sensor membrane with a biosensitive layer formed thereon from, for example, an enzyme.
- An Ag-AgCl reference electrode 7 protruding into the electrolyte is connected via the voltage U bias and an alternating voltage U_ to an aluminum contact electrode 8 (with a layer thickness of 200 nm) located on the back of the substrate 1.
- the thickness of the sensor membrane was selected in the range from 5 nm to 1000 nm, in particular in the range from 30 nm to 100 nm.
- the insulating layer 2 for forming the sensor membrane can be coated by means of laser-induced evaporation of an Al 2 O 3 target by means of a KrF laser, for example.
- the growth rate of the target material to form the membrane is in the range from 0.01 nm / s to 10 nm / s, in particular 1.0 nm / s.
- the set oxygen partial pressure was selected in the range from 1 * 10 "4 mbar to 1 * 10 " 2 mbar.
- the temperature on the substrate surface during the ablation was up to 1500 ° C., in particular in the range from 600 ° C. to 900 ° C., preferably 800 ° C.
- the invention is not limited to the materials or dimensions mentioned here. Rather, other materials or dimensions are also conceivable and usable, depending on the required boundary conditions. Also it is conceivable to provide multiple systems with several sensitive layers 3, in particular sensor membranes and / or biosensitive layers.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Physical Vapour Deposition (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96915992A EP0830590A1 (de) | 1995-06-06 | 1996-06-04 | Ph-sensitiver mikrosensor, sowie verfahren zu seiner herstellung |
US08/999,569 US6132893A (en) | 1995-06-06 | 1997-12-03 | pH-sensitive microsensor and a method of manufacturing a pH-sensitive microsensor |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19520059.4 | 1995-06-06 | ||
DE1995120059 DE19520059C1 (de) | 1995-06-06 | 1995-06-06 | pH-sensitiver Mikrosensor, sowie Verfahren zu seiner Herstellung |
DE29512999.9 | 1995-08-12 | ||
DE29512999U DE29512999U1 (de) | 1995-06-06 | 1995-08-12 | pH-sensitiver Mikrosensor |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/999,569 Continuation-In-Part US6132893A (en) | 1995-06-06 | 1997-12-03 | pH-sensitive microsensor and a method of manufacturing a pH-sensitive microsensor |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996039624A1 true WO1996039624A1 (de) | 1996-12-12 |
Family
ID=26015652
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1996/001021 WO1996039624A1 (de) | 1995-06-06 | 1996-06-04 | Ph-sensitiver mikrosensor, sowie verfahren zu seiner herstellung |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0830590A1 (de) |
WO (1) | WO1996039624A1 (de) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2391467A1 (fr) * | 1977-05-20 | 1978-12-15 | Anvar | Cellule de mesure pour microdosages, comprenant des electrodes a membranes enzymatiques |
EP0039136A2 (de) * | 1980-03-27 | 1981-11-04 | Radiometer A/S | Elektrodensystem, Verfahren zu dessen Herstellung und für dieses Verfahren brauchbare Dispersion |
EP0510584A1 (de) * | 1991-04-23 | 1992-10-28 | Osaka Gas Co., Ltd. | Verfahren zur Herstellung von Elektrodenverbindungen für Brennstoffzellen mit Festoxidelektrolyten |
-
1996
- 1996-06-04 EP EP96915992A patent/EP0830590A1/de not_active Withdrawn
- 1996-06-04 WO PCT/DE1996/001021 patent/WO1996039624A1/de not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2391467A1 (fr) * | 1977-05-20 | 1978-12-15 | Anvar | Cellule de mesure pour microdosages, comprenant des electrodes a membranes enzymatiques |
EP0039136A2 (de) * | 1980-03-27 | 1981-11-04 | Radiometer A/S | Elektrodensystem, Verfahren zu dessen Herstellung und für dieses Verfahren brauchbare Dispersion |
EP0510584A1 (de) * | 1991-04-23 | 1992-10-28 | Osaka Gas Co., Ltd. | Verfahren zur Herstellung von Elektrodenverbindungen für Brennstoffzellen mit Festoxidelektrolyten |
Also Published As
Publication number | Publication date |
---|---|
EP0830590A1 (de) | 1998-03-25 |
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