81results about How to "Low background current" patented technology

Embodiments of the invention provide amperometric analyte sensors having optimized elements such as electrodes formed from sputtered platinum compositions as well as layers of material selected to optimize the characteristics of a wide variety of sensor elements and sensors. While embodiments of the innovation can be used in a variety of contexts, typical embodiments of the invention include glucose sensors used in the management of diabetes.

The invention relates to a microwave electro-Fenton method for processing organic wastewater and a device thereof. Under the action of microwave, a boron-doped diamond film electrode is used as an anode material for electrochemical degradation processing, and organic pollutant containing wastewater is processed efficiently by an electrochemical method. According to the invention, the boron-doped diamond film electrode is utilized to continuously generate hydroxyl radical with strong oxidation capacity in a wastewater system containing divalent iron ions, and in-situ activation of the boron-doped diamond film electrode is carried out by means of thermal effect and non-thermal effect of microwave so as to increase activity of the electrode and promote mass transfer process during the degradation process of organic pollutants. Therefore, the oxidation capacity of the electro-Fenton reaction is enhanced, and mineralization reaction rate is effectively accelerated. In comparison with traditional Fenton and electro-Fenton methods, the processing effect of the microwave electro-Fenton method provided by the invention is effectively enhanced. The method provided by the invention is simple to operate, has a good effect of processing organic wastewater, and has a wide application prospect as well as development potential.

The invention belongs to the technical field of using an electrochemical method for processing organic-polluted waste water, and in particular relates to a microwave electrochemical method for processing waste water and devices. A boron-mixed diamond membrane electrode which has stable work under microwave action is used as an anode material of electrochemical degradation processing of the invention. Devices comprise a thermostatic bath, a peristaltic pump, a flow meter, a reactor, a boron-mixed diamond membrane electrode (anode), a titanium electrode (cathode) and a microwave oven. The invention uses microwaves for promoting the mass transferring process of organic pollutants, activates the boron-mixed diamond membrane electrode, improves electrode activity and accelerates the velocity ofelectrochemical oxidizing reaction. Compared with that of the pure electrochemical oxidization, in the same time, the removal rate of 2,4-dichlorphenoxyacetic acid of the invention is increased by 152 percents. The method has simple operation, and has good processing effect on organic waste water, and wide application prospect and developing potential.

The present invention is a kind of biosensor for quickly detecting glutamate-pyruvate transaminase. The biosensor is made through micro electromechanical processing process to form metal film electrodes and modifying the surface of the film electrodes with one layer of oxidation reduction polymer film as electronic medium to transfer electron between enzyme and electrode surface. The biosensor of the present invention has short response time and high sensitivity, and may be used in the quick detection of glutamate-pyruvate transaminase in fluid medium, such as blood, blood serum, urea, etc.

The present invention relates to a dialysate regeneration device capable of continuously regenerating dialyzate in a dialysis treatment process, or regenerating the dialysate after dialysis, which can greatly reduce the amount of dialysate and clean water used in the dialysate process, The dialysate regeneration device is particularly suitable for dialysate in an emergent condition. The dialysate regeneration device comprises a pump, a reverse osmosis component, an electric catalysis reactor based on BDD electrode and a dialysate water tank. An upstream of the reverse osmosis component is communicated with a liquid outlet of a dialysis machine via the pump; the downstream of the reverse osmosis component comprises two branches, one branch (concentrated water) converges the other branch (clean water) through two groups of electric catalysis reactors and is communicated with a liquid inlet of the dialysate water tank via the confluence port ; a liquid outlet of the dialysate water tank is communicated with the liquid inlet of the dialyzate machine; a filter and air emission component are arranged on a communication channel between the outlet of the electric catalysis reactors and the confluence port.

The invention relates to an electrochemical CO gas sensor which comprises a shell (6), a porous film (7), a reference electrode (1), a working electrode (2) and an auxiliary electrode (3). The reference electrode (1), the working electrode (2) and the auxiliary electrode (3) are encapsulated in the shell (6). The electrochemical CO gas sensor is characterized in that a composite catalyst film (5)is coated on the working electrode (2), hydrogel (4) is simultaneously coated on the reference electrode (1), the auxiliary electrode (3) and the composite catalyst film (5) which is formed by mixinga mixed catalyst and N-octyl pyridinium hexafluorophosphate in a mass ratio of 1-20 to 1, the mixed catalyst is formed by mixing nano Pt/carbon nanotubes and nano nickel / carbon nanotubes in a mass ratio of 10-40 to 1, and the hydrogel is gel formed in a way that superabsorbent absorbs water which contains dissolved lithium perchlorate and polyvinyl alcohol. The sensor is watertight and has the service life of 3-5 years and stable performance, and the decorative film on the working electrode is replaceable.

The invention relates to an electrochemical analyzing method for constructing a 17beta-estradiol aptamer sensor based on a dendritic gold modification boron-mixed diamond film BDD electrode and provides an electrochemical analyzing method high in sensitivity and high in selectiveness. The method comprises the steps of manufacturing special-morphology nanometer dendritic gold/BBD electrodes based on an electrochemistry method and further performing nucleic acid aptamer load assembly by adopting the surface characteristics of the modified electrode to construct the 17beta-estradiol aptamer sensor, wherein the sensor is used for detecting environmental internal-secretion interfering-substance, namely, 17beta-estradiol. Compared with the prior art, a dendritic gold structure with multiple levels of active sites is constructed on the BDD substrate electrode with a simple and novel double-template method, a nucleic acid aptamer capable of being combined with target substances in a peculiar mode is adopted at the same time, noise in the analyzing process is effectively lowered, the detection sensitivity and selectiveness of the sensor are greatly improved, the detection limit reaches 5*10<-15> mol/L, and the sensor has good reproducibility.

The invention discloses a boron-doping diamond film modification-based PEMFC (Proton Exchange Membrane Fuel Cell) bipolar plate and a preparation method thereof, belonging to the field of batteries. In the boron-doping diamond film modification-based PEMFC bipolar plate, after a stainless steel plate is subjected to surface pretreatment, a layer of TI film is sputtered on the stainless steel plate by using magnetron sputtering; a boron-doping diamond film is deposited on the TI film by using heat wire CVD (Chemical Vapor Deposition) equipment; and a diamond film and TI film compounded modification layer is formed on the surface of stainless steel. The stainless steel plate treated by the method has high corrosion resistance and a favorable conductive and heat-conducting property; and according to the stainless steel plate, the battery ratio power can be greatly improved and the PEMFC can achieve the aims of prolonging the service life and reducing the weight, the volume and the cost.

The invention relates to a preparation method of an electrochemical aptamer sensor for the detection of streptomycin. The method is as below: modifying an electrode surface layer by layer by a porous carbon nanospheres (PCNS), polyaniline-copper oxide-gold cage (PANI-CuO-GM) composite, standing to a dry state at normal temperature, then fixing to a streptomycin aptamer to the electrode surface modified by the above nano material, and blocking non-specific binding sites by using bovine serum albumin as a blocking agent; conducting electrochemical test on the prepared streptomycin aptamer sensor, and detecting the streptomycin concentration through current change before and after the combination of the streptomycin with aptamer. The preparation and detection method of the streptomycin aptamer sensor system well solve the tedious procedures of the current sensor preparation, and uses carbon material as a signal amplification material to greatly reduce the manufacturing cost. The electrodes of the same batch of sensors have good identity, and can achieve mass production and commercialization.

The invention discloses a graphene/SDS (Sodium Dodecyl Sulfate)-modified carbon paste electrode and a preparation method thereof. The graphene/SDS-modified carbon paste electrode consists of an electrode lead, a polytetrafluoroethylene tube or a quartz glass tube with inner diameter of 3mm, and a carbon paste filled into the polytetrafluoroethylene tube or the quartz glass tube, wherein one end of the electrode lead wire is straightly inserted into the carbon paste, the other end of the electrode lead is leaded to the outside of the polytetrafluoroethylene tube or the quartz glass tube, and the carbon paste is formed by uniformly grinding and mixing graphite powder, solid paraffin oil and a graphene/SDS composite material; the mass ratio of graphene/SDS in the graphene/SDS composite material is 1:(0.3-0.4). The preparation method comprises the preparation of the graphene/SDS composite material, assembling of the graphene/SDS-modified carbon paste electrode and the like. The graphene/SDS-modified carbon paste electrode has favorable electrochemical activity, reproducibility and stability, is easy in activization and regeneration, and is applied to dopamine detection.

The invention discloses a hardware Trojan detection system based on multi-parameter side channel analysis. The system comprises an acquisition module and a detection module. The invention also discloses a hardware Trojan detection method based on the multi-parameter side channel analysis. The method comprises the following steps that: independently carrying out a time delay test on an original chip group and a chip group to be tested to obtain maximum working frequency fmax during normal work; carrying out module division, applying a test vector group to obtain the transient current of all modules, obtaining the average transient current IDDT of each chip, and drawing an IDDT-fmax graph; and comparing the IDDT value of chip to be tested and the IDDT value of an original chip under the samefmax, and checking whether the IDDT value of the chip to be tested exceeds a threshold value line or not to judge whether the chip to be tested contains Trojan or not. By use of the technical scheme,various parameters, including maximum working frequency, transient current and the like, are used to improve the resolution of Trojan detection.

The invention discloses application of graphite conductive adhesive to prepare a chemically modified electrode or biosensor electrode binder for electrochemical biological sensing detection, wherein, the graphite conductive adhesive comprises the following components by weight percent: 40-60% of an epoxy resin, 20-40% of graphite powder, 10-30% of a diluent and 1.5-3% of an amine curing agent. The graphite conductive adhesive has excellent electrical conductivity, excellent adhesiveness, wide and flat electrochemical window, convenient use, and excellent application prospect in electrochemical biological detection.

The invention discloses a monitoring method for internal corrosion of gas pipe line including steps of: cleaning the working surface of gas pipe line external wall with anhydrous alcohol, cleaning the same with acetone, drying and nickeling with cold air blast; compressing and fixing the testing surface of the monitoring sensor on the nickeling working surface; connecting a constant potential rectifier or a special monitoring instrument to the output socket connector of the monitoring sensor; connecting the signal output terminals of the constant potential rectifier to a data recorder or a computer, collecting stored data for analyzing air tube wall corrosion condition. the invention is not effected by metallic face humidness, has extensive measuring range, and internal corrosion is monitored from outside of tubes, flexible operate mode and convenient simple operation are provided without bypass system.

The invention relates to the field of a biological detection instrument, and particularly relates to a biosensor based on glucose dehydrogenase. The biosensor is composed of an insulation substrate, an electrode system, a detecting reagent, a middle interlayer, a covering layer, a reaction room and a sample injection channel; the reaction room is provided with air holes. Enzyme in the detection reagent is flavin adenine dinucleotide dependent form glucose dehydrogenase; the electronic medium is commonly formed by ruthenium complex and 2, 6-dichlorophen indophenol. The invention further provides a detecting method of the biosensor. The biosensor solves the problem that the pure ruthenium complex is very hard to accept electronic from the flavin adenine dinucleotide dependent form glucose dehydrogenase, thus the biosensor has the advantages of good reaction sensitivity and linearity.

The invention relates to a method for growing an upright three-dimensional netlike noble metal nano-plate on a boron-doped diamond substrate, which comprises the following steps: firstly, when electro-deposition is used in an electrochemical technique, using hydrogen bubbles generated on the surface of a boron-doped diamond film substrate material as a dynamic template so as to obtain an upright three-dimensional netlike nano metal plate; and secondly, in the process of performing a chemical method, using the upright three-dimensional netlike nano metal plate as a template, and through substitution reactions, using high valent noble metal to replace the upright three-dimensional netlike nano metal plate so as to obtain the upright three-dimensional netlike noble metal nano-plate on a boron-doped diamond film. The special structure obtained by the method not only can give full play to the advantages of the boron-doped diamond, but also can greatly improve the specific surface area of the noble metal and effectively promote the diffusion of active reaction molecules in a hole pipeline by a netlike nano structure. Simultaneously, the special combination ensures that a working electrode obtains high electrochemical properties in material types and structural shapes.

The invention discloses a wearable photoelectrochemical biosensor and a preparation method thereof. The biosensor comprises a laser light source, an optical fiber, a micro optical fiber, electrodes, aphotoelectric material and an enzyme. The optical fiber comprises an incident optical fiber and an emergent optical fiber arranged at two ends of the sensor respectively, the incident optical fiber is arranged at an output end of the laser light source, the micro optical fiber is connected between the incident optical fiber and the emergent optical fiber, the photoelectric material is arranged onthe micro optical fiber, and the electrodes are continuously plated outside the optical fiber and connecting ends of the optical fiber and the micro optical fiber. The wearable photoelectrochemical biosensor can be applied to a skin patch or fabric, sweat secretion on a surface of a skin is dynamically monitored in real time in 24 hours, the concentrations of glucose, lactic acid and the like areanalyzed, and human health condition information is fed. The structure is simple, the preparation method is mature in process, the preparation cost is low, and the popularization and use are easy.

The invention discloses a high-specific-surface-area super-hydrophilic gradient boron-doped diamond electrode and a preparation method and application thereof. According to the gradient boron-doped diamond electrode, a substrate is directly taken as an electrode base; or the surface of the substrate is provided with a transition layer, and then the substrate is taken as the electrode base, a gradient boron-doped diamond layer is arranged on the surface of the electrode base, and the wetting angle theta of the gradient boron-doped diamond electrode is smaller than 40 degrees; and the gradient boron-doped diamond layer sequentially comprises a gradient boron-doped diamond bottom layer, a gradient boron-doped diamond middle layer and a gradient boron-doped diamond top layer with the boron contents increased in a gradient mode from bottom to top. Therefore, the gradient boron-doped diamond layer has high attraction force, high corrosion resistance and high catalytic activity at the same time, high-boron content of the top layer is combined with one-time high-temperature treatment, so that the gradient boron-doped diamond electrode has the high specific surface area and superhydrophilicity, and the mineralization degradation efficiency of the gradient boron-doped diamond electrode can be greatly improved.

The invention discloses a manufacturing method and application of a nano diamond and myohemoglobin modification based electrochemical enzyme sensor. The manufacturing method comprises the following steps: firstly, weighing and adding a proper amount of graphite powder and ion liquid into a mortar, sufficiently grinding to uniformly mix, filling into a glass electrode tube to compact, internally inserting a copper wire as a guide wire, thereby manufacturing a carbon ion liquid electrode (CILE); dispersing nano diamond (ND) into deionized water to prepare dispersion liquid of different concentrations, performing ultrasonic treatment for 2-3 hours to disperse uniformly, taking and dropwise coating a certain volume of nano diamond dispersion liquid to the surface of CILE, and drying in air atthe room temperature to obtain ND/CILE; fixing myohemoglobin (Mb) to the surface of ND/CILE to dry in air at the room temperature to obtain Mb/ND/CILE; and coating a Nafion alcohol solution to the surface of Mb/ND/CILE, and drying in air at the room temperature to obtain the electrochemical enzyme sensor (Nifion/Mb/ND/CILE). Nifion/Mb/ND/CILE is further taken as a working electrode for being applied to electrochemical detection of targets such as trichloroacetic acid, sodium nitrite and hydrogen peroxide, so that the effective and accurate measurement can be realized, detection response time is short, detection limit is low, linear range is wide, and the stability is good.

The invention relates to a carbon-based electrochemical sensor for detecting heavy metal lead ions and application thereof. The preparation method of the carbon-based electrochemical sensor comprises the following steps: 1, perprocessing hydrophobic carbon paper, enabling graphene oxide to be subjected to electrodeposition reduction through cyclic voltammetry, and obtaining a CP/rGO electrode; and 2) dispensing a dsDNA solution on the surface of the CP/rGO electrode, and then performing drying to obtain the CP/rGO/DNA carbon-based electrochemical sensor which is used for detecting the concentration of heavy metal lead ions in a water environment. Compared with the prior art, the sensitivity and selectivity of the sensor are improved by utilizing the characteristic that DNA and lead ions can be specifically combined, and the loading capacity of the DNA is increased by utilizing pi-pi accumulation and hydrophobic interaction between rGO and DNA; the anodic stripping peak current of the differential pulse anodic stripping voltammetry is adopted as a quantitative detection basis, the detection sensitivity can be effectively enhanced, the detection limit is as low as 1 pM, and the detection method is rapid, simple and convenient and can be used for detection and analysis of trace heavy metal lead ions.

The invention discloses a preparation method of a nano-bismuth trioxide graphene composite membrane electrode for detecting lead ions and cadmium ions, and belongs to the technical field of electrodematerials. The preparation method comprises the following steps: ultrasonically dispersing 1 to 2 mg of nano-bismuth trioxide graphene composite powder in 500 [mu]L of 10 percent Nafion solution to obtain nano-bismuth trioxide composite graphene glassy carbon electrode modifying liquid; performing ultrasonic treatment on the glassy carbon electrode for 5 minutes by using ethyl alcohol, nitric acidand deionized water in sequence, repeatedly grinding the treated glassy carbon electrode to a mirror surface by using alpha-Al2O3 powder with the particle sizes of 1.0, 0.3 and 0.05 [mu]m in sequence, and drying after the mirror surface is subjected to ultrasonic cleaning for 5 seconds by using the deionized water; dripping and coating the treated glassy carbon electrode surface with 6 to 10 [mu]L of the nano-bismuth trioxide composite graphene glassy carbon electrode modifying liquid which is prepared in the fifth step; drying the glassy carbon electrode surface by nitrogen to obtain the nano-bismuth trioxide graphene composite membrane electrode. According to the preparation method of the nano-bismuth trioxide graphene composite membrane electrode for detecting the lead ions and the cadmium ions, peak shapes of dissolution peaks of heavy metal ions to be detected are symmetrical; the reproducibility is high; the sensitivity is high; the detection limit is low.

The invention relates to a three-dimensional gallium nitride-based exhalation type gas sensor and a preparation method thereof, and belongs to the technical field of gas sensors. A two-dimensional unintentionally doped and n-type GaN thin film is formed on a sapphire substrate in an epitaxial mode, then a Ni/SiO2 hexagonal mask plate is prepared, a high-quality Nano p-i-n structure grows on the mask plate in an epitaxial mode, and a novel Nano p-i-n diode is formed; and the Nano p-i-n structure and a PDMS/graphene transfer electrode technology are combined to prepare the gas sensor with high sensitivity and high selectivity. The GaN-based device adopted by the invention is relatively insensitive to temperature, relatively stable in device performance, good in biocompatibility and environmental friendliness, simple and easy to operate in detection process, high in result repeatability and low in equipment maintenance cost.

The invention relates to a method for treating sewage through electrocatalytic oxidation. An electrocatalytic oxidation reactor with the following structure is adopted, an anode material of the reactor is a boron-doped diamond film/porous carbon/lead dioxide ternary composite electrode, and a cathode material is a good conductor of electricity generally, such as one or more of carbon steel, stainless steel, activated carbon fiber, graphite and the like, preferably activated carbon fiber; and activated carbon is added during sewage treatment. The boron-doped diamond film/porous carbon/lead dioxide ternary composite electrode material is adopted as an anode, and the filling particle coupling effect is combined, so that the method has the advantages of high oxidation efficiency, high pollutant degradation speed, low energy consumption and the like.