352 results about "Chemical sensor" patented technology

Embodiments herein relate to an optical chemical sensor system that is wearable and includes a microneedle array. In one embodiment, the invention includes a chemical sensing device having a set of microneedles and sensor elements. The sensor element may include a first low refractive index gel layer, a second low refractive index gel layer, and a chromogenic ionophore sensing film disposed between the first low refractive index gel layer and the second low refractive index gel layer. In one embodiment, a retardation layer may be disposed between the sensor element and a set of microneedles. An optical emitter may be configured to emit light into the sensor element. An optical detector may be configured to receive light from the sensor element. Other embodiments are also included herein.

The invention provides a flexible electrochemical sensor, a preparation method and application. The flexible electrochemical sensor comprises a flexible substrate, three electrodes, a conductive strip, an external wire and a multi-cavity polypyrrole film, the three electrodes comprise a working electrode, a reference electrode and an auxiliary electrode and are printed on the flexible substrate; the conductive strip is connected with the three electrodes, the conductive strip is packaged through an insulating tape, and only working areas of the three electrodes are exposed; the external wire is pasted on the conductive strip through conductive silver adhesive. The multi-cavity polypyrrole film is modified on the surface of the working electrode. The technical problems that existing equipment is insufficient in portability, cannot meet the requirements of on-site rapid screening and real-time analysis of large-batch samples, and is difficult to realize on-site mobile detection are solved. The invention provides a feasible technical means for portable, mobile and on-site rapid detection of high-harm heavy metal ions such as Hg < 2 + > and Cd < 2 + >, and the method is simple to operate and extremely low in cost.

The invention discloses a dual-emission molecular imprinting ratiometric fluorescence sensor, a preparation method thereof and application of the dual-emission molecular imprinting ratiometric fluorescence sensor in aureomycin detection, and belongs to the technical field of chemical sensors. The preparation method of the sensor comprises the following steps: preparing silicon dioxide-quantum dot composite nanoparticles, and preparing a molecularly imprinted polymer by taking salicylamide as a template molecule; and mixing the molecularly imprinted polymer and the silicon dioxide-quantum dot composite nanoparticles in an HEPES buffer solution by adopting a post-mixing strategy to construct the dual-emission molecularly imprinted ratiometric fluorescence sensor. The double-emission molecular imprinting ratiometric fluorescence sensor has the beneficial effects that the double-emission molecular imprinting ratiometric fluorescence sensor provided by the invention is rich in fluorescence color change, rapid, high-sensitivity and visual detection of aureomycin can be realized, the whole detection process is simple, convenient and rapid, and the double-emission molecular imprinting ratiometric fluorescence sensor is suitable for being widely popularized in practical application.

The invention belongs to the technical field of electrochemical detection, and discloses an anti-pollution electrochemical saliva sensor based on fluorinated side chain polypeptide as well as a preparation method and application of the anti-pollution electrochemical saliva sensor. The fluorinated side chain polypeptide disclosed by the invention not only has excellent hydrophilicity, can form a dense hydration layer with water molecules to repel pollutants, but also has low surface energy, and the interaction between the pollutants and an interface is remarkably reduced. Through the synergistic effect, the fluorinated side chain polypeptide has better anti-pollution performance compared with traditional zwitterionic polypeptide. The anti-pollution electrochemical sensor constructed on the basis of the fluorinated side chain polypeptide can be used for directly detecting CA15-3 in saliva, the saliva does not need to be pretreated, and the detection accuracy can be comparable with that of a commercial ELISA (Enzyme-Linked Immunosorbent Assay) method.

The invention discloses an anionic surfactant and a preparation method and application thereof.The anionic surfactant has a double-wedge-shaped molecular structure, alkaline earth metal benzene sulfonate serves as a polar hydrophilic wedge tip, a long-chain alkoxy flexible chain segment serves as a hydrophobic wedge group, the surface tension of water can be remarkably reduced in an aqueous solution, and the anionic surfactant has excellent emulsifying capacity. The molecular structure is based on alkaline earth metal benzene sulfonate and has good thermotropic and lyotropic liquid crystallinity, the liquid crystal phase temperature range of the molecular structure exceeds 140 DEG C, and the phase transition temperature and the mesogenic state temperature range can be controlled by adjusting the number of carbon atoms of an alkoxy substituent. When in a mesogenic state, the molecules can form a supramolecular columnar phase through self-assembly aggregation, and the columnar structure can form a transmission channel with ion recognition in the column center direction. By utilizing the characteristic, a novel bionic ion selective conduction membrane can be constructed, and the biomimetic ion selective conduction membrane has wide application potential in the aspects of preparation of ion selective electrodes and chemical sensors and the like.

The application discloses a continuous acquisition and data model construction system and method of an intelligent sensor. In order to overcome the problems that the training data acquisition of the chemical sensor in the prior art is inconsistent with the actual application, the data acquisition efficiency is low, and effective data is insufficient, in the training process, the sensor unit is placed in the test unit, and the concentration control unit is used to adjust the concentration of different samples, so that the data is continuously acquired. In the prediction process, the sensor unit is placed in the sample input unit, is input into the concentration prediction model after correction by the state calibration unit, and the sample concentration output is obtained. The continuous data sampling method is used, the recovery process is not performed, and the balance state is reached in a relatively short time, so that the training time is greatly reduced; the response and recovery stage data are continuously acquired, so that the training data is consistent with the signal and concentration change process in the actual application; in the prediction process, the state of the sensor is dynamically detected and different models are called, so that the model accuracy is improved.

This invention provides a food fraud detection device using terahertz spectroscopy that achieves a compact and stable structural configuration. [Solution] The food fraud detection device 100 using terahertz spectroscopy according to the present invention comprises a base housing 20 and an upright housing 21 attached to the base housing 20. A display unit 1 is provided in the upright housing 21, and a user input unit 2 is provided in the base housing 20. The main body of the device 100 is equipped with a wireless connection antenna 7, a voice generation unit 8, a voice input port 81, first to fourth connection ports 31, 32, 33, 34, an external sensor connection port 4, a server connection port 5, and a port 6 for opening the device. An optical sensor 10, an ultrasonic sensor 11, and a chemical sensor 12 are arranged on the base housing 20 together with corresponding control switches 13, 14, 15.

The invention relates to an electrochemical sensor having a porous diaphragm and an electrolyte formulation that comprises at least one solvent, at least one electrolyte from the group of alkali metal salts and at least one alkaline earth metal ion, and to an electrolyte formulation.

The application discloses an electrochemical sensor and a preparation method and application thereof. The electrochemical sensor comprises a three-electrode system composed of a working electrode, a reference electrode and a counter electrode, wherein the working electrode is composed of a base electrode, a molybdenum disulfide nanoparticle modification layer and a polyethylene dioxythiophene layer; the molybdenum disulfide nanoparticles are loaded on the surface of the base electrode through a drop coating method, and the polyethylene dioxythiophene is in-situ loaded on the surface of the molybdenum disulfide nanoparticle modification layer through an electro-polymerization reaction. The electrochemical sensor can be used for detecting lead ions in water bodies, has the advantages of simple preparation, stable performance, suitability for an acidic medium and the like, and is suitable for practical application and popularization.

The application discloses a preparation method of an anode layer / electrolyte layer heterostructure based on superfast high-temperature sintering, and comprises the following steps: placing a double-layer element blank of an anode layer / electrolyte layer on a graphite felt heating element under a vacuum atmosphere, and directly contacting the electrolyte layer of the double-layer element blank with the graphite felt heating element; wherein the anode layer is a NiO-ceramic composite anode layer; and making an electric current pass through the graphite felt heating element to cause the Joule heat of the graphite felt heating element, and then performing superfast high-temperature sintering on the double-layer element blank through heat radiation and / or heat conduction. The application can avoid the delamination, warping and micro-cracks that are prone to occur in the traditional high-temperature co-sintering forming method; the temperature gradient can be controlled through electric parameters, and the NiO in the anode layer can be reduced to metal Ni at low temperature in the sintering process, and the application has the advantages of simple process, high efficiency and low cost, and provides a new way for the large-scale preparation of solid oxide fuel cells, solid oxide electrolysis cells, high-temperature electrochemical sensors or other multilayer heterostructures.

The invention discloses a high-precision wide-range expiration detection device and method, which is applied to the technical field of expiration detection, and comprises an expiration sampling unit used for collecting an expiration sample; the gas analysis unit consists of a three-way valve, an analysis pump, an electrochemical sensor module and a filter; the control and calculation unit is used for controlling the three-way valve to perform quick switching of closing and opening according to the size of the real-time output signal when the ratio of the output signal to the saturation signal is greater than a preset threshold value, so that the expiration sample is mixed with the zero-point gas filtered by the filter before entering the electrochemical sensor module; the gas concentration in the expiration sample is calculated according to the proportion of the output signal, the sensitivity and the closing time of the three-way valve; the double clinical requirements for high precision and wide range of expiration detection are met.

The invention belongs to the technical field of electrochemical sensors, and relates to an electrochemical sensor for detecting the ion content in urine by taking ZIF-8 as a center, a detection method and an antibacterial catheter. An electrode array is arranged in the electrochemical sensor and comprises a working electrode, a counter electrode and a reference electrode; the working electrode comprises a ZIF-8 modified carbon electrode, and the electrode is prepared by coating a flexible substrate containing a carbon electrode with turbid liquid containing a ZIF-8 composite porous sensitive material and then drying. The ZIF-8 composite porous sensitive material is prepared by in-situ synthesis on a polyvinyl chloride material containing hydroxyl or carboxyl through a one-step method. When the sensor is used for ion detection, the anti-interference performance is high, the sensitivity is high, the ion selectivity is high, and the concentration of ions such as K < + >, Na < + > and Cl <-> in urine can be monitored for a long time under soaking. When the catheter loaded with the sensor is used for urine drainage of a patient, ions in urine can be detected in real time, and the sensor has lasting antibacterial performance.

The invention belongs to the technical field of food safety detection, and particularly relates to a histamine molecular imprinting electrochemical sensor based on a carbon-based nano composite material and a preparation method and application of the histamine molecular imprinting electrochemical sensor. Aiming at the problems of poor selectivity, high detection limit or complicated operation and the like of the existing histamine detection technology, a Co3O4 / N-HCS (cobaltosic oxide / nitrogen-doped hollow carbon sphere) composite material is prepared by adopting a solvothermal method, o-phenylenediamine (o-PD) is taken as a functional monomer, a molecularly imprinted polymer membrane (MIP) is constructed on the surface of a glassy carbon electrode (GCE) by adopting an electropolymerization method, and the histamine detection electrode is prepared. The MIP / Co3O4 / N-HCS / GCE sensor with specific recognition sites on histamine is formed. The sensor has high selectivity, high sensitivity and good stability, is simple and convenient to operate and rapid in detection, can efficiently realize accurate detection of histamine in food, and is suitable for safety monitoring scenes of various foods such as fermented food, aquatic products and dairy products.

The application provides a preparation method and application of a flexible electrochemical sensor and belongs to the technical field of electrochemical detection. The preparation method is as follows: first, polyurethane sponge is soaked in a conductive carbon paste dispersion solution to obtain a conductive support; second, the conductive support is soaked in an aqueous chloroauric acid solution for electrochemical deposition to obtain a gold nano-structure layer modified conductive support; third, the gold nano-structure layer modified conductive support is placed in a groove of a PDMS base, and the gold nano-structure layer modified conductive support is separated into a working area and a clamping area by pouring PDMS to obtain a working electrode; and finally, a flexible electrochemical sensor is assembled. The flexible electrochemical sensor is used for hydrogen peroxide detection and has good biocompatibility, excellent tensile properties and stable electrochemical sensing performance.

A technique capable of accurately identifying a chemical substance in a sample is provided. The present technology provides an electrochemical sensor circuit, or the like, including: at least two or more electrochemical sensor units connected to one AC signal generation unit; at least one or more response signal output circuits that output a response signal from the electrochemical sensor units; and an identification system unit that identifies a chemical substance in a sample on the basis of an output from the response signal output circuits.

The invention discloses a chitosan modified ferroferric oxide / carboxylated multi-walled carbon nanotube-based molecularly imprinted electrochemical sensor as well as a preparation method and application thereof, and relates to the technical field of electrochemical sensing. The invention aims to solve the problems that the existing method for detecting carbendazim is complicated to operate and high in cost and the traditional sensor is poor in selectivity. The invention discloses a molecularly imprinted electrochemical sensor based on chitosan modified ferroferric oxide / carboxylated multi-walled carbon nanotubes. The molecularly imprinted electrochemical sensor comprises a glassy carbon electrode, and a molecularly imprinted polymer and CS-Fe3O4-CMWCNTs which are modified on the surface of the glassy carbon electrode, the molecularly imprinted polymer is prepared by taking carbendazim as a template molecule, methacrylic acid as a functional monomer, ethylene glycol dimethacrylate as a cross-linking agent and azodiisobutyronitrile as an initiator. The molecularly imprinted electrochemical sensor is applied to detection of carbendazim.

An electrical power transmission tower includes a lattice structure having a lower end configured to be anchored to the ground, and an opposite upper end. The lattice structure includes a plurality of parallel legs joined together in a polygonal cross-section configuration to define an internal space. At least one support arm extends outwardly from the lattice structure and at least one insulator is suspended from the at least one support arm. The at least one insulator is configured to support one or more electrical power transmission lines. A mast is movable within the internal space of the lattice structure along a vertical axis between a lowered position and a raised position. The mast supports various electronic equipment, such as cellular antenna arrays, remote radio unit (RRU) arrays, microwave antennas, imaging equipment, acoustic sensors, tectonic or motion sensors, thermal sensors, chemical sensors, and / or nuclear sensors.

The application relates to the technical field of semiconductor nanomaterials, and discloses an environment-friendly zinc sulfide nanoparticle as well as a preparation method and application of the zinc sulfide nanoparticle. The preparation method comprises the following steps: (1) activating Aspergillus oryzae spores, performing liquid fermentation, filtering the liquid fermentation product, washing, collecting solid substances, and obtaining biomass; (2) culturing the biomass in the step (1) in a ZnSO4.7H2O aqueous solution to obtain an Aspergillus oryzae liquid solution containing zinc sulfide nanoparticles; (3) drying the liquid solution obtained in the step (2) to obtain Aspergillus oryzae precipitate containing zinc sulfide nanoparticles; and (4) heating the precipitate in the step (3) at 400-450 DEG C for 4-6 h to obtain zinc sulfide nanoparticles. The application endows the zinc sulfide nanoparticles with excellent biocompatibility, expands the application of the zinc sulfide nanoparticles in the fields of biomedicine, chemical sensors, solar cells and light-emitting diodes, and provides a reference for the environment-friendly and batch production of the zinc sulfide nanoparticles.

This invention discloses a dual-emission molecularly imprinted ratiometric fluorescence sensor, its preparation method, and its application in the detection of chlortetracycline, belonging to the field of chemical sensor technology. The preparation method of this sensor includes the following steps: preparing silica-quantum dot composite nanoparticles; preparing a molecularly imprinted polymer using salicylamide as a template molecule; and using a post-mixing strategy to mix the molecularly imprinted polymer and silica-quantum dot composite nanoparticles in HEPES buffer to construct the dual-emission molecularly imprinted ratiometric fluorescence sensor. The advantages of this invention are: the dual-emission molecularly imprinted ratiometric fluorescence sensor provided by this invention exhibits rich fluorescence color changes, enabling rapid, highly sensitive, and visual detection of chlortetracycline; and the entire detection process is simple, convenient, and fast, making it suitable for widespread application in practical applications.

The present disclosure provides an electrochemical sensor, the electrochemical sensor comprising: a gate electrode; a source electrode; a drain electrode; and an field communication layer, wherein the field communication layer is configured to allow diffusion of an analyte into the field communication layer, wherein the analyte undergoes a reaction proximate the gate electrode and within the field communication layer to produce an electrical response, and wherein the electrical response is configured to facilitate current flow between the source electrode and the drain electrode.

The invention relates to the technical field of air purification, in particular to a novel device for detecting and removing formaldehyde. The elbow suction pipe is rotationally communicated with the top of the purification box, and the other end of the elbow suction pipe is detachably communicated with a filter pipe; and the electronic chemical sensor is detachably mounted in the filter pipe and extends into the elbow suction pipe. The formaldehyde content in the air is detected through the electronic chemical sensor, when the formaldehyde content exceeds the standard, the ultraviolet lamp and the suction pump can be automatically started, a photocatalyst is irradiated through the self-rotating ultraviolet lamp, a formaldehyde eliminating agent is sucked into the self-rotating spraying head through the suction pump, the formaldehyde eliminating agent is sprayed to the air in a large range, and the formaldehyde eliminating effect is good. The formaldehyde in the air can be removed while the formaldehyde in the air is detected, and the purification efficiency is improved.

An electrochemical sensor includes a working electrode, a counter electrode, and a substrate supporting the working electrode and the counter electrode, the working electrode is a chip-shaped electrode having a diamond film and a support, a redox reaction occurs on the surface of the diamond film when a predetermined voltage is applied between the working electrode and the counter electrode in the presence of a test sample, the support is formed of a material other than diamond and supports the diamond film, and the working electrode is mounted on the substrate with the support on the substrate side and at least a part of the side surface of the support exposed.

Sensor system (1) comprising an arrangement of chemosensors (2, 2') and a control and evaluation unit (3) associated therewith, wherein the chemosensors (2, 2') are capable of detecting foodstuffs by detecting gaseous substances, and wherein the control and evaluation unit (3) is configured to identify foodstuffs and determine the properties of these foodstuffs based on sensor signals from the chemosensor(s) (2, 2'), wherein the sensor system is part of a product tracking system, characterized in that the latter has at least two different chemosensors (2, 2') which form a diverse redundant sensor system.

The invention relates to the technical field of medical health monitoring, in particular to an intelligent paper diaper cloud health data management method and system, biomarker data in urine of a wearer is collected through a flexible electrochemical sensor integrated in a paper diaper, and the biomarker data is sent to a mobile terminal through wireless communication after being processed by a micro-processing unit. And the mobile terminal encrypts and uploads the data to the cloud health data management platform. And the cloud platform performs cleaning, feature extraction and health assessment on the data, generates a health state analysis result and abnormal early warning information, and stores related data in a personal health file of the user to realize trend analysis and historical tracing. The invention further provides a corresponding system structure which supports multi-index collaborative detection, hierarchical authority access and model self-learning optimization, is suitable for scenes such as home care, old-age care institutions and medical health management, and has the advantages of high detection sensitivity, high intelligent degree and high data security.

A chemical sensor including: (a) a first electrode; (b) a second electrode spatially separated from the first electrode by an electrode gap; (c) metal nanoparticles disposed within the electrode gap between the first electrode and the second electrode, the metal nanoparticles separated from each other by nanoparticle gaps; and (d) a semiconductor material disposed within the electrode gap and the nanoparticle gaps. Additionally disclosed is a method of making the chemical sensor including a metal layer forming step, which can include a dewetting step that forms the metal nanoparticles from the metal layer formed during the metal layer forming step. Further disclosed is method for sensing a target substance with the chemical sensor.

The invention discloses a preparation and detection method of a bisphenol A electrochemical sensor based on a carbon nanosphere composite material, and belongs to the technical field of functional nano composite materials and sensing. The preparation method comprises the following steps: synthesizing carbon nanospheres by a hydrothermal method, carboxylating the carbon nanospheres, performing ultrasonic treatment in a hexadecyl trimethyl ammonium bromide solution, performing electrostatic interaction to obtain a carbon nanosphere / hexadecyl trimethyl ammonium bromide compound, and dispensing compound dispersion liquid on the surface of an electrode to obtain the bisphenol A electrochemical sensor. According to the present invention, the high-conductivity carbon nanospheres, the carboxylation effect for improving the dispersibility and providing more electrochemical sites, and the hexadecyl trimethyl ammonium bromide with the strong adsorption effect are integrated, and the constructed bisphenol A electrochemical sensor has the low detection limit (0.8 nM); the electrochemical sensor constructed by the invention has the advantages of higher detection speed, wider detection range and better reproducibility, and is successfully applied to bisphenol A detection in an actual sample.

The invention provides a chip, method, device and equipment for micro-plastic detection, the micro-channel electrochemical sensor chip comprises a micro-channel layer and a packaging layer which are arranged in sequence, an electrode system is embedded in the packaging layer, the micro-channel layer is provided with a sample introduction micro-channel communicated with the electrode system, and the sample introduction micro-channel is communicated with the electrode system. One end of the sample introduction microchannel is a sample introduction end, and the other end is formed in an electrode area; a plurality of electrical interfaces are also formed in the edge of the micro-channel chemical sensor chip, and the electrodes are connected with the electrical interfaces so as to be electrically connected with an external electrochemical workstation. Key information such as particle size distribution and concentration of a to-be-detected micro-plastic sample is obtained based on an electrochemical signal.

The invention relates to the field of electrochemical sensors, and provides photonic crystal hydrogel and a preparation method thereof, a wearable sweat sensor and application. The photonic crystal hydrogel is suitable for detecting the concentration of potassium ions in sweat, and the structural color of the photonic crystal hydrogel can change along with the change of the adsorption quantity of the potassium ions in the sweat so as to characterize the concentration of the potassium ions in the sweat. When the photonic crystal hydrogel is used for detecting the concentration of potassium ions in sweat, the operation is simple, the cost is low, and the consumed time is short.

The invention discloses an electrochemical sensor, a preparation method of the electrochemical sensor and application of the electrochemical sensor to detection of deoxynivalenol, and relates to the field of sensors and food safety detection. The electrochemical sensor comprises an electrode, and a modification layer and a DNA layer which are arranged on the surface of the electrode; the modification layer is Cu-Pt spherical nanoparticles, and the DNA layer comprises a complementary chain and a nucleic acid aptamer. According to the invention, Cu-Pt spherical nanoparticles are adopted as a signal amplification element to be modified on the surface of an electrode, double-folding-arm arched structure DNA is constructed on the modified surface of the electrode through a platinum-sulfur bond, a target object cyclic amplification signal is realized under the action of exonuclease Exo I, and quantitative detection of the target object DON is realized. The Cu-Pt spherical nanoparticles can directly catalyze reduction of hydrogen peroxide on the surface of the electrode to generate an electric signal, the physical barrier of the DNA with the double-folding-arm arched structure affects the magnitude of the electric signal, and the constructed sensor has the advantages of high sensitivity, simplicity in operation, good specificity and the like.