404 results about "Electrochemical gas sensor" patented technology

Systems and methods of use for continuous analyte measurement of a host's vascular system are provided. In some embodiments, a continuous glucose measurement system includes an electrochemical sensor incorporating a silver/silver chloride reference electrode, wherein a capacity of the reference electrode is controlled.

A detector includes a smoke detecting section that includes a light-receiving unit at a position at which the light-receiving unit does not directly receive light emitted by a light-emitting unit in a chamber in which a labyrinth for preventing light from directly entering from the outside and an insect net covering the rim of the labyrinth are provided, the light-receiving unit receiving light scattered by smoke flowing into the chamber. An opening hole is formed open in the surface of the cover receiving hot air current, of the detector. In the cover behind the opening hole, an electrochemical gas sensor is placed to bring gas generated by a fire through the opening hole into contact with an electrolyte solution to detect the gas by an electrode.

An electrochemical gas sensor, a method for making the sensor and methods for the detection of a gaseous species. The electrochemical gas sensor is a solid-state gas sensor that includes a solid polymer electrolyte. A working electrode is separated from a counter electrode by the solid polymer electrolyte. The sensor can include a multilaminate structure for improved detection properties, where electrode microbands are disposed within the solid polymer electrolyte.

The invention relates to a gas sensor and its method of manufacture.

Electrochemical gas sensors usually comprise an external housing, which acts as a reservoir for electrolyte; a wick to keep electrodes wetted with the electrolyte and external electrical terminals, for making electrical contact with the electrodes. Typically a gas permeable/microporous membrane has been used to seal a gas sensor in order to prevent leakage of electrolyte. A problem with existing sensors has been that there was a risk of electrolyte leaking through the membrane around the region where electrical connectors passed therethrough.

The present invention overcomes this by providing a method of urging conductive polymer through the membrane under controlled conditions of heat and pressure, thereby ensuring the integrity of the membrane remains in tact while defining an electrically/conductive pathway therethrough.

An electrochemical gas sensor has a hollow housing with multi-layer walls. A first layer of the walls has a selected water vapour transport rate. A second layer of the walls has a lower water vapour transport rate than the selected rate. The housing can be formed by first and second moulding processes.

The presence of a serviceable electrochemical gas sensor (1) in gas detecting apparatus is determined on the basis of the noise in the output of a sensor amplifier. A microcomputer (22) calculates mean, rms or variance values for the noise in the output of the amplifier (20) for successive periods. Each of these values is compared with the threshold and if it falls below the threshold, counter is incremented. When the counter reaches a target value, it is determined fault condition as arisen and an alarm (23) is operated.

The invention discloses a printing type paper microfluid chip and a manufacture method thereof. The chip comprises one or an integrated component of a paper base, an electrode formed by conductive metal ink, a heater, a thermosensitive sensor, a photosensitive sensor, a magneto-dependent sensor, a piezoelectric sensor, a humidity-dependent sensor, an electrochemical sensor and an electrode array electric wetting pump. The printing type paper microfluid chip and the manufacture method thereof provided by the invention have the advantages that a low-melting-point liquid metal ink is introduced, sensor pieces arranged on the whole chip can be directly manufactured in a printing manner, so that the chip is obtained; the chip is finished in a preparation process under the normal temperature and normal condition, the common biodegradability paper is adopted as a base, the environmental requirement is not high, the complexity of the preparation technology of the microfluid chip is remarkably reduced, the manufacture efficiency is greatly improved, and the cost is reduced.

A mediator-based electrochemical gas sensor reacts selectively with hydrogen sulfide. The gas sensor has an electrolyte solution (9), which contains a mediator compound in the form of metallates of transition metals.

An electrochemical gas sensor and a method of manufacturing the same are provided. The electrochemical gas sensor includes: a substrate; an electrode patterned on the substrate; a solid electrolyte layer having proton conductivity formed on the substrate having the patterned electrode; and a hydrophobic microporous membrane formed on the solid electrolyte layer. The gas sensor chip is easily integrated with a driving circuit and uses a solid electrolyte layer, and thus it can be manufactured in a smaller size and in a large area process.

An electrochemical sensor for organic molecules such as ethylene includes an electrochemical cell, gas sample inlet means and means for detecting current produced by the oxidation of the organic molecule at the anode of the cell. The sensor is capable of sensing multiple organic molecules in some embodiments. A voltage is applied to the anode of the cell to provide energy to drive the oxidation reaction and produce a corresponding current. The sensor of the invention can be made as a small, hand-held unit that is capable of real-time detection of various organic species.

The invention discloses an electrochemical gas sensor. The sensor mainly comprises a working electrode, a paired electrode, a reference electrode and electrolyte. At least one substrate surface of the electrodes is equipped with an electrochemical active group or a carbon nanotube electrode which is modified by metal nano-particles. The sensor is mainly used for, but is no limited to, the detection of gas with concentration less than 0.1ppm.

The invention provides a calibration method of an electrochemical sensor. The method comprises the following steps: inputting different concentrations of a standard gas to an electrochemical sensor to be calibrated through a dynamic gas distribution device, measuring the output value of the electrochemical sensor, and determining the calibration zero point of the sensor; and respectively fitting the zero point of the electrochemical sensor to be calibrated, the temperature curve of a measuring range and the temperature curve of cross interference in a temperature range of -20-40DEG C. The dynamic gas distribution device is adopted to carry out multi-point concentration test in order to accurately reflect the state of the sensor; a relative error value is adopted to calibrate, so the calibration result is more close to a practical condition; and a least square method quadratic polynomial fitting sensor input and output curve relationship is adopted, so the error in the calibration process is greatly reduced. The method has the advantages of wide test surface and high estimation accuracy, and can meet users' practical demands on test selection of sensors.

The present invention relates to an electrochemical gas sensor that includes a first planar substrate having at least one planar electrode formed thereon, thereby forming a first electrode assembly, and a housing defining a reservoir which, in use, contains liquid electrolyte for contacting the electrode(s). The housing has a first sealing face to which the first electrode assembly is sealed, the sealing face having conducting portions electrically isolated one from another. A portion of at least one electrode is in contact with a respective conducting portion so as to provide a means of external electrical connection to the electrode(s). The conductive portions and non-conductive portions of the housing are co-moulded. This sensor has a relatively small number of component parts and is relatively cheap and easy to manufacture. It also provides a cheap and reliable way of forming external electrical connections to the electrodes.

The invention discloses an electrochemical sensor used for bisphenol A detection, which belongs to the technical field of electrochemical analysis detection. The invention also discloses a preparation method for the electrochemical sensor and an application of detecting bisphenol A in a single pattern. The preparation method for the electrochemical sensor comprises the following steps: grafting beta-cyclodextrin to the surface of a carbon nano tube, wherein the beta-cyclodextrin can be easily dispersed into secondary distilled water; dropwise adding a dispersion to a glassy carbon electrode; and evaporating to dry a solvent to obtain the electrochemical sensor constructed by a sensitive film and the glassy carbon electrode. The electrochemical sensor has high sensitivity on detecting the bisphenol A and high stability, and the detection lower limit reaches 1*10-9mol/L.

A liquid electrolyte composition obtainable by combining a first component comprising bistrifluoromethanesulfonimide and/or an analogue thereof with a second component comprising a dialkyl sulfone, diaryl sulfone, alkyl aryl sulfone, alkyl acyl sulfone, boric acid, alkyl boronic acid, aryl boronic acid, dialkyl phosphite, trialkyl phosphite, dialkyl phosphate, trialkyl phosphate, alkylene carbonate, alkanoic lactone, preferably alkanoic γ-lactone an analogue of any of these, or mixtures thereof, wherein any of the alkyl, aryl of alkenyl groups may be substituted or unsubstituted. The liquid electrolyte is used in an electrochemical gas sensor.

The invention discloses a three-electrode integrated electrochemical sensor based on a microelectrode array. The sensor comprises the bismuth film modified microelectrode array (gold working electrode), a silver/silver chloride electrode (reference electrode) and a platinum electrode (counter electrode). The three electrodes are prepared through a standard MEMS technology, and multiple discs at equal intervals are evenly distributed on the gold electrode to serve as the microelectrode array. In the electrochemical detection process, heavy metal gathering and dissolving-out reacting occur on the microelectrode array, and the surface of the microelectrode array is modified with a bismuth film in order to increase the detection type of heavy metal and expand the detection range of the heavy metal. The surface of the silver electrode is electroplated with silver chloride to form the Ag/AgCl reference electrode. The platinum electrode serves as the counter electrode and forms an access with the working electrode. Difference pulse stripping voltammetry is utilized for determining the concentration of the heavy metal, and a result shows that the sensor is high in detection sensitivity, low in detection limit and high in signal-to-noise ratio; the sensor is easy and convenient to operate, needs a small quantity of samples, can be used for rapidly detection heavy metal on site and is capable of efficiently monitoring environmental pollution in real time.

The invention relates to the field of electrochemical sensors, and in particular relates to an HCN (hydrogen cyanide) four-electrode electrochemical sensor resistant to nitrogen monoxide and nitrogen dioxide interference. The HCN electrochemical sensor provided by the invention comprises a first working electrode, a second working electrode, a reference electrode and a counter electrode which form ion conduction via electrolyte, wherein the first working electrode is a carbon element electrode, and the second working electrode an Au-containing electrode. The HCN electrochemical sensor provided by the invention is capable of effectively eliminating the cross interference between NO and NO2 and accurately measuring the concentration of an HCN gas via the design of a four-electrode sensor system comprising the reference electrode, the counter electrode and the two working electrodes.

The invention discloses an electrochemical glucose sensor based on modification of graphene and nano-particle and application thereof. The electrochemical glucose sensor is composed of a reference electrode, an auxiliary electrode and a work electrode, wherein the work electrode comprises a chromium layer, an inert electrode layer, a graphene layer, a metal nano-particle layer and a glucose oxidase layer which are arranged in sequence; the reference electrode, the auxiliary electrode and the work electrode are adhered on a glass substrate respectively through the chromium layer. The application of the electrochemical glucose sensor is as follows: the electrochemical glucose sensor based on modification of the graphene and nano-particle and a microfluidic chip for tissue fluid transdermal extraction are integrated; the glass substrate in the electrochemical glucose sensor and a bonding surface of the microfluidic chip are bonded together; electrode ends of the reference electrode, the auxiliary electrode and the work electrode in the electrochemical glucose sensor are arranged in a microfluidic channel of the microfluidic chip. The electrochemical glucose sensor is high in measurement precision and small in volume and achieves integration of continuous measurement of glucose concentration in the tissue fluid and tissue fluid transdermal extraction.

The invention relates to the field of electrochemical sensors, in particular to an electrochemical sensor for field trace heavy metal detection. In the electrochemical sensor, a working electrode, a reference electrode and an auxiliary electrode are connected to a control potentiometer through leads; the working electrode is plated with a film by using electroplate liquid before the detection of a practical sample; and before detection, the practical sample needs mixing with detection liquid. A detection method comprises the following steps of: adding a sample to be detected into the detection liquid on site, mixing uniformly and standing for later use; and putting the cleaned and ground working electrode into the electroplate liquid together with the reference electrode and the auxiliary electrode for pre-plating a bismuth film, inserting the three electrodes into the detection liquid and detecting the concentration of heavy metals in the sample to be detected by an electrochemical co-plating method. The sensor has low cost, high sensitivity and high repeatability, is easy and convenient to operate and can be widely applied to rapid on-site detection and daily monitoring of heavy metal ions in fresh water, sea water, articles for daily use and body fluid.

The invention relates to an electrochemical gas sensing apparatus for sensing one or more analytes, such as NO₂ and/or O₃, in a sample gas and a method of using same. The apparatus uses Mn₂O₃ as a filter for ozone. The Mn₂O₃ may take the form of a powder which may be unmixed, mixed with various PTFE particles sizes, formed into a solid layer deposited onto a membrane and/or pretreated with NO₂.

The invention discloses a hydrogen peroxide non-enzyme electrochemical sensor for detecting H2O2 by utilizing the response of a chemical electrode under H2O2. A chemical electrode is a pair of electrodes embellished by noble metal nanometer particles, and the noble metals are gold, silver, platinum, palladium or iridium; the electrodes embellished by noble metal nanometer particles are the noble metal nanometer particles which are deposited on an electrode material through a beam depositing method, the deposit rate of the nanometer particles in the deposition of the nanometer particles is controlled to be more than 0.3 layer and less than 5 layers, and a glassy carbon electrode material or nano-graphite is adopted as an electrode material. The hydrogen peroxide non-enzyme electrochemical sensor provided by the invention has the advantages that the electrode embellished by the method enables the surface of the electrode to have the good dispersibility and crystallinity as well as the clean surface, a problem that a catalyst of the traditional method is easy to gather and fall is solved, using of a conductive binding agent is avoided, the effective catalyzing area and stability of the electrode are improved, and the delivery of an electron between the electrode and the catalyst is accelerated.

A filter that allows specific detection of ethylene oxide by a non-specific electrochemical gas sensor through the removal of potential interferent gases, such as alcohols, and carbon monoxide. The filter contains an oxidizing agent that will oxidize the interferent gas but not ethylene oxide or alternatively a polymeric material that allows selective hydrogen bonds to the interferent gas but not ethylene oxide. This filter is intended for use with ambient air gas monitors, such as those employed to enhance work-place safety.