329 results about "Screen printed electrode" patented technology

Partial fill of an electrochemical test strip is determined by making a DC determination of double layer capacitance from charging or discharging charge on a test strip containing sample, for example a blood sample to be tested for glucose. The measured double layer capacitance is compared to a reference value. The double layer capacitance may be determined as an integral or differential capacitance. Double layer capacitance may also be used for quality control to monitor the quality of electrode formation, particularly in strips using screen printed electrodes.

Partial fill of an electrochemical test strip is determined by making a DC determination of double layer capacitance from charging or discharging charge on a test strip containing sample, for example a blood sample to be tested for glucose. The measured double layer capacitance is compared to a reference value. The double layer capacitance may be determined as an integral or differential capacitance. Double layer capacitance may also be used for quality control to monitor the quality of electrode formation, particularly in strips using screen printed electrodes.

Phosphorus diffusion formed PN junction is setup on P type silicon chip. There is silicon nitride layer, or surface passivation layer of silica, reflection reducing coating and positive electrode on front face. Characters are that through P type punctual alloy diffusion zone, back metal layer of silicon chip constitutes ohmic contact. Preparing method includes steps: selecting P type chip; preparing knap surface and cleaning; forming PN junction through phosphorus diffusion; etching and corroding edges by using plasma; developing silicon nitride or silica at both sides; preparing point contacted dense P+ zone at back side through screen printing by using solid-solid phase diffusion or selective gaseous phase diffusion; printing and sintering electrode through screen printing; adding metal layer to full back side. The solar cell reaches indexes: open circuit voltage larger than 650mV, current density larger than 38mA / cm2, fill factor as 74úÑ-78úÑ and conversion efficiency 18úÑ-20úÑ.

The invention relates to a preparation method of an electrochemical biosensor, and particularly relates to a preparation method of a dehydrogenase-electrochemical biosensor. The method comprises the following steps of: preparing nano biocomposite from all components (including a carbon nanomaterial, an electronic mediator, a high-molecular polymer, dehydrogenase, coenzyme and buffer solution) required for modifying electrodes in a preparation process of the sensor; and modifying the composite material to the surface of a screen-printed electrode by a simple one-step dispensing method, so as to prepare the dehydrogenase-electrochemical biosensor. By adopting the method, the preparation process of the dehydrogenase-electrochemical biosensor is simplified, and the method is suitable for mass production; an inter-batch difference and the difference between batches are reduced; and the detection sensitivity and accuracy and the storage stability are improved.

A non-enzymatic electrochemical method of simultaneous measurement of hemoglobin (Hb) and percentage of glycated hemoglobin (% HbA1c) in a blood sample is disclosed. The method includes determining the total amount of hemoglobin in a sample by electrochemically measuring the voltammetric current due to iron (II) and iron (III) redox portions in hemoglobin and determining the percentage of glycated hemoglobin (HbA1c) by potentiometry. Also disclosed is a novel screen-printed electrode (SPE) strip modified for potentiometric measurement of HbA1c.

The invention discloses a method for researching and applying a paper chip electrochemical luminescence immunosensor for detecting tumor marker by using a composite nano material. The paper chip and sensor preparation method (see the schematic diagram in the attached figure) mainly comprises the steps of printing designed channel patterns on a piece of chromatographic paper by using a printer; heating the wax printed chromatographic paper by using an electronic temperature controller; preparing a graphene-metal composite nano material and a quantum dot-porous silicon nano material; modifying the nano material on the paper chip; connecting an antibody to the paper chip modified by the nano material; after antigen specificity identification, carrying out antigen specificity identification on the antibody marked by a luminescent material so as to make the electrochemical luminescence immunosensor; and detecting an electrochemical luminescence signal with the combination of the processed paper chip with a screen-printed electrode. The sensor is strong in specificity detection and high in sensitivity, and the sensitivity can be of ng grade; the diagnosis and monitoring speed is fast, and the time for accomplishing one basic detection process is shorter; and a film electrode at the bottom of the sensor can be repeatedly used for multiple times, so that the cost is low.

The invention discloses a visual portable three-dimensional hollow passageway microfluidic paper chip sensor which is simple in operation, low in cost and self-energized, and is successfully used for field inspection. A biological fuel cell is successfully introduced into a three-dimensional hollow passageway microfluidic paper chip by virtue of the sensor; by virtue of the negative and positive electrodes of the biological fuel cell, an electrical signal for the catalytic effect of a substrate is automatically generated, and restriction on energy supply equipment is avoided. The construction process of the sensor is as follows: largely printing lyophobic patterns, carrying out molten wax molding, and preparing hollow passageway by use of a laser cutting machine, then printing a screen-printed electrode, and preparing electrodes of the biological fuel cell by virtue of long gold; preparing a complex three-dimensional graphene modified electrode; respectively modifying the positive and negative electrodes of the biological fuel cell with a glucose oxidase and a laccase; and synthetizing an electrochromic material and uniformly painting the electrochromic material on the ITO, clamping each paper chip unit by virtue of a self-control circuit board, connecting the paper chip units with the ITO painted with the electrochromic material, adding a glucose solution to trigger reaction, and determining the glucose concentration range by virtue of observing color changes of the electrochromic material.

The invention discloses a graphene / bismuth composite material and a modifying method of a screen printed electrode. A preparation method of the graphene / bismuth composite material includes dissolving and mixing to form a mixture containing 1-25mmol / L of water-soluble bismuth salt, 10-100mg / L of graphene oxide and 1-25mmol / L of reductant; heating to enable the mixture for reaction to obtain the graphene / bismuth composite material. The modifying methodincludes mixing the graphene / bismuth composite material at a mass ratio of 20-200:1 with Nafion liquid; coating a mixture on the screen printed electrode; drying to obtain a modified screen printed electrode with high heavy-metal ion detection repeatability. In addition, the preparation method is easy in raw material getting, convenient in synthesis, quick in reaction and free of pollution in the process of production, and large-scale production can be realized quickly.

The invention discloses a method for detecting of the heavy metal lead content of the teas, the major steps include that: the tea samples to be measured are carried out the microwave digestion in the presence of H2O2 and nitric acid with a certain proportion, 0.1mol / L of NH4Cl solution dilution digestion liquid is used, the mercury plating liquid is added till the concentration of mercury ions in the solution achieves 4 multiplied by 10 to <4>mol / L, and the solution is detected by combining a screen-printing electrode with a data collection and processing system. The invention applies the electrochemical analysis method, adopts the three-electrode-to-one screen-printing electrode, uses the method of mercury plating in situ and takes the square wave stripping voltammetry as the tection method, so the invention has the advantages of simple, rapid, sensitive, accurate and economic.

The invention discloses a portable ractopamine molecular imprinted silk-screen printed electrochemical sensor, and belongs to the technical field of fast detection. 60-100 [mu]L of an electric conductance solution contains a to-be-detected sample is dropwise added to the surface of a ractopamine molecular imprinted silk-screen printed electrode, the standing adsorption time is 50-200 s, then the ractopamine molecular imprinted silk-screen printed electrode is horizontally inserted into a clamping slot of a portable electrochemical detector, a current peak value during scanning is recorded, calculation is performed according to a standard curve between the ractopamine concentration and the current peak value I([mu]A)=-14.944logC([mu]M)+0.2641 (R<2>=0.9923); and finally, the detected concentration of ractopamine in the sample is displayed on an LED screen. The sensor has the advantages of high precision, high stability and high repeatability.

The invention discloses preparation and detection methods of a screen-printed electrode immunosensor for rapidly detecting microcystin, and belongs to the field of environment monitoring technologies. Through a magnetic field formed by a magnet below a screen-printed electrode, core-shell magnetic nanoparticles Fe3O4@Au are fixed on the surface of a working electrode; through the adsorption between nano-Au and a microcystin antibody, the microcystin antibody is fixed on the surface of the electrode to prepare an MCLR antibody electrode; a certain concentration of MCLR and MCLR which is marked by horse radish peroxidase are together modified on the surface of the working electrode; after immunoreaction is performed for a period of time, a peak current value is measured by using DPV (differential pulse voltammetry) to obtain standard curves of the MCLR and the oxidation peak current; the steps are repeatedly carried out on water samples to be detected, and the obtained oxidation peak currents are compared with standard curves to obtain the MCLR concentration. According to the preparation and detection methods of the screen-printed electrode immunosensor for rapidly detecting microcystin, benefit is brought to rapidly detect the MCLR, the water samples do not need purification treatment, simplicity and rapidness are achieved, and the detection cost is reduced.

The invention relates to the application of a screen printing electrode in the determination of 5-hydroxytryptamine. The invention has higher sensitivity and low cost by using the screen printing electrode for determining 5-hydroxytryptamine. The screen printing electrode comprises an electrode substrate which is printed with a carbon electrode, a counter electrode and an Ag / AgCI electrode; each electrode is correspondingly connected with an electrode lead wire. Carbon printing ink manufacturing the carbon electrode can contain aerosol granules so as to increase the response sensitivity of electroactive material.

A screen printed light emitting polymer device is fabricated by depositing an electroluminescent polymer layer between a transparent electrode and an air stable screen printed top electrode. This invention describes advantageous methods and materials for printed top electrodes for polymer light emitting devices including composite electrode inks containing conducting particles, ionic, semiconducting and non-conducting components. These improvements can simplify device processing and costs as well as improve device performance in terms of voltage, prevention of shorting, operating lifetime and other metrics.

The invention discloses a method for electrochemically detecting the concentration of glucose in whole blood through an integrated paper based micro-fluidic apparatus. The method comprises the following steps: dispersing graphene / polyaniline / nano-gold composite material in a chitosan-acetic acid solution to prepare a graphene / polyaniline / nano-gold composite material mixed solution, uniformly mixing the graphene / polyaniline / nano-gold composite material mixed solution with a glucose oxidase solution to obtain a solution mixture, modifying a screen printing electrode, fixing the modified screen printing electrode, adding a sample to a filter paper disc in a dropwise manner, air-drying, covering the surface of the modified screen printing electrode with the filter paper disk, adding a phosphate buffer solution in a dropwise manner, and carrying out electrochemical test. A small filter paper disk is used as a support in the invention, so convenient sample preservation, reduction of the reagent consumption and the sample consumption, and making cost saving are realized.

The invention relates to a preparation method of a double-sided tunneling oxidation passivation high-efficient N-type double-sided battery, which comprises the following steps: cutting silicon wafer to remove damage layer for velveting; doping high-temperature vapor phase boron source to form p + emitting junction; growing ultra-thin tunnel oxide layer SiO2 and P-doped polycrystalline silicon layer on the back of the silicon wafer; Frontal tunneling oxidation passivation structure is formed on the p + emitting junction surface by thermal oxidation and polycrystalline deposition. A local heavily dope region is formed on that back side of the silicon wafer by laser doping or wet patterning etch method, and a hydride amorphous silicon nitride passivation antireflection layer is deposited on the front side / back side of the battery. At last, that front and back electrode metallize ohmic contact is formed by screen printing electrode grid line. A metal on that back of the battery is minimizeby the invention. Semiconductor surface recombination can obtain Voc enhancement of about 35mV, and the technology route is compatible with the existing traditional single crystal battery preparationprocess to improve the battery efficiency.

The invention discloses a screen painting electrode, which comprises a printing sizing agent that is used on a substrate and adopts a mixture of titanium powder and nano titanium oxide, a working electrode that is prepared through a screen painting technique, separately processed by chemical modification and provided with an electrode specification layer that is solidified by printing ultraviolet lights of photocureable insulating slurry, an auxiliary electrode that realizes the printing by adopting a carbon powder printing ink and a silver and silver chloride sizing agent on another substrate, and a silver chloride reference electrode; all electrode plates are assembled together by a silicon rubber. The invention further discloses a preparation method of the screen painting electrode and a plurality of application methods of the screen painting electrode. The invention can be widely applied in various electrochemical analysis fields, and is especially applicable to the heavy metal ion measurement with stripping voltammetry as well as the pesticide residue and veterinary drug residue measurement with adsorption wave voltammetry in food analysis and environment monitoring.

The invention discloses a preparation method and an application of a sensor for simultaneously detecting four aminoglycoside antibiotics and belongs to the technical field of novel function materials and biosensor analysis. According to the invention, a reference electrode is printed by the use of a silver paste and four working electrodes and a counter electrode are printed by the use of a conductive carbon paste on a rectangular substrate surface coated with a layer of a polyester film. Thus, a four-channel screen-printed electrode is prepared. The preparation method is characterized in that antibodies of four aminoglycoside antibiotics including streptomycin, gentamycin, kanamycins and spectinomycin are respectively fixed on surfaces of the four working electrodes by the use of a Pt nanoparticle-sulfated graphene-carboxymethyl chitosan conductive composite nano-material; and after the detection liquids are dripped, the four working electrodes are connected with a multichannel electrochemical workstation detection circuit so as to realize simultaneous detection of the four aminoglycoside antibiotics. The sensor provided by the invention is simple to prepare and convenient to process, requires low cost, and is convenient to carry. The detection method is simple and rapid and has high sensitivity and good specificity.

The invention provides a non-enzymic glucose sensor of a modified nanometer copper oxide screen-printed electrode. According to the making method of the non-enzymic glucose sensor, a double-layer overprinting nano-silver interpolation circuit and a copper oxide sensing layer of a screen process press are adopted, and the non-enzymic glucose sensor which is low in cost and easy and rapid to use and has the large-area printing function is manufactured; flexible quantitative analysis and measurement of glucose are conducted through a current-time curve method. The sensor is high in sensitivity, high in response speed and good in stability, the glucose detection linear range ranges from 1 micron to 3 millimeters, the detection limit is 10 nm, and the sensitivity is 1328.64 muA.L.mmol<-1>cm<-2>.

The invention relates to a method for detecting l,5-AG based on a persimmon tannin composite nano material. The method comprises the steps of the preparation of a composite nano material, the activation and modification of a silk-screen printing electrode, and the construction of a biological sensing interface. According to the method, H2O2 is generated by means of the signal amplification and excellent electron transfer effect of RGO / PT / Pt-Pd NPs, and the specific catalysis effect of PROD on the l,5-AG; the H2O2 is subjected to the catalytic decomposition of the RGO / PT / Pt-Pd NPs; generated electrons are transferred onto the surface of the electrode through the RGO / PT / Pt-Pd NP composite nano film; current response signals are measured through DPV; a working curve is drawn according to a relation between the concentration of the l,5-AG and the response current of a sensor; and the detection of the l,5-AG is realized.

The invention discloses a solar cell with the front side free of electrode shielding and a preparation method thereof, and belongs to the field of solar cell preparation. The cell is characterized in that sintered P-type silicon is arranged on the front side of an N-type silicon substrate, the N-type silicon substrate and the P-type silicon form a PN junction, an ITO (indium tin oxide) light-transmitting conducting film is covered on the surface of the P-type silicon, and extraction electrodes formed by screen-printed electrodes are arranged on the side faces and the back of the N-type silicon substrate. The electrode on the front side of the substrate is transferred to the back to enable the front side of the solar cell to be free of metal and connection point shielding, so that electrode shielding of incident light is reduced to the utmost extent, utilization rate of cells is increased, and assembling and mounting processes of the cell are simplified by the back coplanar electrode. Besides, the light-transmitting conducting film, the PN junction of the solar cell, the front side screen-printed electrode, the side face screen-printed electrodes and the back screen-printed electrode are completed at a time by adopting the high-temperature sintering diffusion technology, and intermediate processes and unnecessary material consumption are reduced greatly.

The invention discloses a method for improving PERC (passivated emitter and rear cell) cell back slot contact. The method includes the sequential steps of silicon wafer polishing, texturing, diffusion, edge etching and PSG (phospho silicate glass) removal, two-side passivation, electrode screen printing and sintering. The method is characterized in that a step where back screen printing of Al paste is performed to form a grating aluminum back field is added to the step of edge etching and PSG removal; after a silicon wafer with the grating aluminum back field is passivated, a main gate of the a back printed electrode burns through a passivation layer to be in contact with the grating aluminum back field; current carriers can be fully collected, and the step of back slotting before the conventional two-side passivation step is omitted; the grating aluminum back field is composed of a plurality of fine gratings arranged in order. The method has the advantages that the step of PERC cell back slotting is omitted, the process is simple, production efficiency is improved, manufacturing cost is lowered, and the performance is better.

The invention relates to a method for preparing hidden-type emitter silicon solar cells, which adopts a quadratic diffusion process. The method comprises the following steps: 1. laser boring; 2. cleaning, radiation damage removing and suede preparation; 3. diffusion; 4. hiding launching area; 5. emitter area corrosion and periphery joint removing; 6. hiding removing; 7. oxidizing and surface passivation; 8. screen printing electrode; and 9. sintering. The method can prepare the hidden-type emitter silicon solar cells.

The invention discloses a method used for detecting alpha fetoprotein based on graphene, thionine, and a nucleic acid aptamer. According to the method, electrodeposition technology is adopted for deposition of nano-gold on the surface of a screen-printed electrode, electrostatic adsorption is adopted for absorption of graphene and thionine which drop on an electrode surface onto the surface of thescreen-printed electrode, thionine is taken as a bridge molecule for capturing of the nucleic acid aptamer onto the surface of a modified electrode. A nanometer aptamer biosensor can be constructed based on the extremely large specific surface area and signal amplification effect of graphene, the high loading capacity of thionine on the aptamer, and the specific recognition effect of the aptameron alpha fetoprotein. Peak value current is measured through differential pulse voltammetry, and the relation curve of the current to the alpha fetoprotein concentration is drawn, so that detection onalpha fetoprotein is short in time, low in cost, and high in the specificity.

The invention provides a COB type LED packing piece based on beryllium oxide ceramic substrate and production method, and the packing piece comprises a substrate made of the beryllium oxide ceramic board, a box dam and two symmetrical electrodes are formed on the substrate; a plurality of series circuits not crossed to each other and composed of light-emitting diode are formed in the substrate solid crystal region, two ends of each series circuit are respectively connected to two electrodes, the fluorescent powder glue is fixedly sealed in the box dam. The COB type LED packing piece based on beryllium oxide ceramic substrate is prepared by the steps as follows: cleaning beryllium oxide ceramic board, screen-printing the electrode, high temperature sintering, manufacturing the box dam, baking and dehumidifying, plasma cleaning, pasting LED chip, baking, bonding, baking, coating fluorescent powder glue in the box dam and solidifying, blanking, spectral testing, packaging and putting in storage. The beryllium oxide substrate is applied to the LED in the LED packing piece with good heat radiation capability, the high power LED packing product is small in volume, light in weight and high in reliability.

A peroxidase catalytic silver deposition-based method for detecting GPC3 comprises the steps of building an electrochemical nanometer sensor, activating and modifying a silk-screen printed electrode,building a biological sensing interface, drawing a working curve of the GPC3 and detecting a to-be-detected sample. An HGNs-Apt signal probe is fabricated by taking HGNs as a carrier, and an Apt-GPC3-HGNs-Apt sandwiched electrochemical nanometer aptamer sensor is built; silver ions in a solution are reduced to metal silver deposited on a surface of the electrode by H2O2 and by means of a catalyticeffect of peroxidase of HGNs, the deposition quantity of Ag is obtained according to quantity of GPC3 protein, and quantization is performed by differential pulse voltammetry (DPV); and current response of Ag and GPC3 concentration are in favorable positive correlation within a range being 10.0-100.0 micrograms per mL, and GPC3 detection is achieved.

The invention discloses a low-cost and high-precision preparation method of carbon-based and metal-based electrode arrays. The low-cost and high-precision preparation method comprises the steps that laser engraving, photosensitive seal and other formwork construction technologies are adopted, an independently designed electrode array filtering area is constructed on the surface of a filtering membrane, a formwork filtering principle is used for controlling a conductive material and a modified material to form an electrode array on the surface of the filtering membrane, and the carbon-based andmetal-based electrode arrays of different types are prepared in batch through subsequent rendition or packaging treatment. According to the low-cost and high-precision preparation method of the carbon-based and metal-based electrode arrays, the preparation process is simple, the precision is high, the materials are saved, the pollution is low, the cost is low, a conductive material dispersion solution of a low concentration can be used, and the electrode arrays of various materials can be rapidly prepared in batch. The prepared electrode arrays have the advantages that the resistance is low (resistance of carbon-based electrode arrays is less than 30 omega / sq, and resistance of metal-based electrode arrays is less than 2omega / sq of), the structural composition is easy to adjust and control, the suitable substrates are wide, the homogeneity and the reproducibility are good, various deficiencies of commercial silk-screen printing electrodes can be effectively overcome, and the low-costand high-precision preparation method of the carbon-based and metal-based electrode arrays have wide application prospects in fields of environmental protection, food safety, disease diagnosis and thelike.

The invention provides a sensitive membrane and a screen-printed electrode containing the sensitive membrane. The screen-printed electrode comprises an electrode substrate, wherein a working electrode, a reference electrode and an auxiliary electrode are printed on the electrode substrate, and the surface of the working electrode is coated with a layer of sensitive membrane; and the sensitive membrane is sequentially composed of a carbon nano tube, nano-zinc oxide and graphene. The screen-printed electrode can be used for determining microelements, vitamins, amino acids, aminophylline, digoxin, uric acid or monoamine transmitters and the like, and has the characteristics of high sensitivity, good selectivity, low cost, rapidness in determination, easiness in operation, and the like.

An electrochemical method for capsaicinoid and / or related compound detection in a sample by way of a screen printed electrode having a working electrode, a reference electrode, and a counter electrode. The working electrode can be screen-printed using conductive carbon ink; the reference electrode can be screen printed using conductive carbon ink; the counter electrode can be screen printed using silver / silver chloride. The method includes contacting the electrode with the sample in the presence of electrolyte solution, and determining whether a change in redox potential occurs by way of differential pulse voltammetry, wherein a modulation amplitude is between approximately 0.1 volt / min and approximately 2.0 volt / min, a step potential is between approximately 0.0005 volt and approximately 0.01 volt, a modulation time is 0.05 seconds, and a corresponding interval time is approximately 0.5 second.

The invention relates to a portable heavy metal lead, cadmium, and zinc sensor, a preparation method thereof, and a detection method. Three electrodes are provided on a polyester film substrate through silk-screen printing. One of the electrodes is a bismuth oxide operation electrode, one is a carbon auxiliary electrode, and the last one is a silver and silver chloride reference electrode. Carbon lead-out wires of the three electrodes are provided on the polyester film substrate through silk-screen printing. The areas on the substrate, except the front portions of the three electrode lead-out wires and the three electrodes, are coated with an insulating layer formed by insulating slurry. The heavy metal sensor with silk-screen printed electrodes has advantages of simple structure, quick detection, low cost, and small sampling volume. The sensor is portable and disposable. With the sensor, simultaneous on-line monitoring of heavy metal lead, cadmium, and zinc ions in environmental water samples can be carried out. Introducing of mercury film electrode is avoided. The detection method has advantages of no pollution, high sensitivity, and good repeatability. The heavy metal sensor is an environment protecting product which ensures the ecological safety of water environment, and the detection method is an environment protecting method.

The invention relates to an antibiotic residue detector based on a screen-printed electrode aptamer sensor. The detector is composed of a detection circuit, a screen-printed electrode aptamer sensor, a power supply, keys, a microcontroller and a display screen, wherein a detection chip generates excitation voltage which is applied to the screen-printed electrode aptamer sensor to collect corresponding impedance signals. Ions and ferroferric oxide are used for modifying the surface of a screen-printed electrode layer by layer, then the screen-printed electrode stands still at room temperature till getting dry, and tetracycline aptamer is fixed on the surface of the screen-printed electrode which is modified by a nanometer material, and thus the screen-printed electrode aptamer sensor is prepared. The antibiotic residue detector can realize on-line and rapid detection for antibiotic residue, has the characteristics of strong practicability, convenience in carrying, high detection accuracy, rapidness and accuracy in detection, simplicity in operation and the like, and is particularly suitable for rapidly detecting antibiotic residue on site.