Electrochemical gas sensor with diamond electrode
AssigneeDragerwerk Aktiengesellschaft
InventorsHerbert Kiesele, Frank Mett, Peter Tschuncky
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Abstract
An electrochemical gas sensor for detecting a specific gas being measured with a plurality of electrodes (21, 3, 4), an electrolyte (7) and a gas-permeable membrane (9) has a reduced cross sensitivity with respect to interfering gases, a short response time and high sensitivity for the measured gas without the service life being reduced. The measuring electrode is a layer of doped diamond thin (21) on a porous substrate (22), where the gas-permeable memebrane is disposed over the measuring electrode to permit passage therethru of the gas being measured.
Claims21
An electrochemical gas sensor, comprising:
- a plurality of electrodes including a measuring electrode for detecting a specific gas being measured, at least the measuring electrode being designed as a thin layer made of doped diamond on a porous substrate;
- an electrolyte;
- and
- a gas-permeable membrane disposed over the measuring electrode to permit passage therethru of the gas being measured.
An electrochemical gas sensor for detecting a specific gas being measured, comprising:
- a sensor housing with an opening;
- an electrolyte in the housing;
- a gas-permeable membrane closing the opening
- a plurality of electrodes including a measuring electrode and an auxiliary electrode, at least the measuring electrode being designed as a thin layer made of doped diamond on a porous substrate, where the gas-permeable membrane is disposed over the measuring electrode to permit passage therethru of the gas being measured.
An electrochemical gas sensor, comprising:
- a plurality of electrodes including a measuring electrode for detecting a specific gas being measured, at least the measuring electrode being designed as a thin layer made of doped diamond on a porous substrate, said thin layer of diamond being doped with nitrogen, with a doping corresponding to about 1020 nitrogen atoms per cubic centimeter;
- an electrolyte;
- and
- a gas-permeable membrane, where the gas-permeable membrane is disposed over the measuring electrode to permit passage therethru of the gas being measured.
An electrochemical gas sensor, comprising:
- a plurality of electrodes including a measuring electrode for detecting a specific gas being measured at least the measuring electrode being designed as a thin layer made of doped diamond on a porous substrate, said porous substrate being nonwoven quartz with a layer thickness of 0.2 mm to 0.5 mm;
- an electrolyte;
- and
- a gas-permeable membrane, where the gas-permeable membrane is disposed over the measuring electrode to permit passage therethru of the gas being measured.
An electrochemical gas sensor, comprising:
- a plurality of electrodes including a measuring electrode for detecting a specific gas being measured, at least the measuring electrode being designed as a thin layer made of doped diamond on a porous substrate, said thin layer of diamond being doped with boron, with a doping corresponding to 1019 to 1021 boron atoms per cubic centimeter, a surface of said thin layer of doped diamond being additionally doped with a precious metal;
- an electrolyte;
- and
- a gas-permeable membrane, where the gas-permeable membrane is disposed over the measuring electrode to permit passage therethru of the gas being measured.
Dependencies are inferred from the claim text.