219 results about "Fluorine doping" patented technology

The invention discloses a modified carbon-coated sodium manganese ferric phosphate pyrophosphate / sodium ferric phosphate pyrophosphate positive electrode material as well as a preparation method and application thereof, and relates to the technical field of new energy materials. The preparation method comprises the following steps: preparing MnFe-MOF from a manganese source, a first iron source and a first organic ligand under a hydrothermal reaction; a second iron source, the MnFe-MOF and a second organic ligand are subjected to a hydrothermal reaction, and MnFe-MOF / Fe-MOF is obtained; uniformly mixing with a sodium source and a phosphorus source, and sintering to obtain a positive electrode material; and carrying out high-temperature gas-phase etching treatment to obtain the fluorine-doped carbon-coated modified sodium manganese ferric phosphate pyrophosphate / sodium ferric phosphate pyrophosphate positive electrode material. The material disclosed by the invention has a coating modified structure, so that an interface side reaction caused by direct contact between sodium ferromanganese phosphate and an electrolyte can be effectively avoided, a manganese dissolution phenomenon is reduced, and the structural stability of the material is improved; and meanwhile, the material has high conductivity, excellent structural stability, excellent long cycle life and excellent rate capability.

The invention discloses a fluorine-nitrogen-doped carbon-based oxygen reduction electrocatalyst for a zinc-air battery and a preparation method of the fluorine-nitrogen-doped carbon-based oxygen reduction electrocatalyst, and belongs to the technical field of catalysts. According to the method, a fluorocarbon mixture is rapidly treated through Joule heat to achieve efficient fluorine doping, then nitrogen doping is conducted through an ammonia gas plasma technology, and therefore an original carbon precursor is converted into fluorine-nitrogen-doped carbon. The catalyst material is short in preparation time and high in production efficiency, the content configuration of fluorine and nitrogen doped in fluorine-nitrogen-doped carbon finally formed by accurately controlling the temperature and time of Joule heat treatment and the power and time of plasma treatment is controllable, the morphology and the pore structure are controllable, high electro-catalytic performance is guaranteed, and the catalyst material is suitable for industrial production. The preparation method is high in production efficiency and low in cost, and has large-scale amplification potential.

The invention relates to a composite diaphragm with high ionic conductivity, a composite solid electrolyte and a preparation method thereof. The composite diaphragm is composed of a lithium lanthanum-based fluorine-doped solid electrolyte LLMOF and a base membrane, the chemical general formula of the LLMOF is Li < x > La < y > M < 1 > < z > M < 2 > < w > M < 3 > O < 6 > F, wherein M1 is a tetravalent cation, M2 is a pentavalent cation, and M3 is a hexavalent cation; 1 < x + 3y < 5, 0 < x < = 2, and 1 / 3 < y < 5 / 3; 0 < = z < = 2, 0 < = w < = 2, 0 < = u < = 2, z + w + u = 2; the base membrane is a large-aperture base membrane, and the aperture r is more than or equal to 200nm and less than or equal to 1mu m; the particle size D50 of the LLMOF is 50 nm to 1 [mu] m, and the particle size D50 of the LLMOF is less than or equal to the aperture r of the base film. According to the composite diaphragm disclosed by the invention, the LLMOF solid electrolyte with an ion channel function is introduced, so that efficient conduction of ions is realized; the particle size is matched with that of a large-aperture base membrane, the membrane can be uniformly embedded into membrane holes, a continuous conduction path is constructed, and the ionic conductivity is improved; meanwhile, the composite diaphragm has excellent thermal stability and interface wettability, interface impedance is effectively reduced, and growth of lithium dendrites is inhibited.

The invention discloses a preparation method of a negative electrode material of a sodium ion battery, a negative electrode plate containing the negative electrode material and the sodium ion battery, and the negative electrode material is prepared by taking biomass waste semen cassiae as a carbon precursor and montmorillonite as a template and combining an in-situ fluorine ion exchange and carbonization process. The preparation method comprises the following steps: mixing semen cassiae with montmorillonite, removing a template, and carrying out fluorine ion exchange to obtain the fluorine-doped three-dimensional porous carbon composite material. According to the material, micro / mesopore distribution is regulated and controlled through a confinement effect between montmorillonite layers, uniform doping of fluorine elements is realized, and an electronic structure and a pore channel system are synergistically optimized. The composite material has rich sodium storage active sites, efficient ion / electron transmission paths and stable interface characteristics, can significantly improve the specific capacity, rate capability and cycle life of the sodium-ion battery, and has important application value in the field of sodium-ion battery negative electrode materials.

The invention provides a preparation process of an environment-friendly film coating, and belongs to the technical field of coatings, the preparation process comprises the following steps: S1, mixing 3-4 parts of epoxy resin, 25-28 parts of polyurethane emulsion, 35-38 parts of water-based acrylic resin emulsion, 0.5-1 part of a curing agent, 0.5-1 part of an accelerant, 2-2.5 parts of a dispersing agent, 0.3-0.5 part of a wetting agent and 6-8 parts of PVA emulsion to obtain a first mixture; s2, adding 4-5 parts of fluorine-doped hexagonal boron nitride and 10-12 parts of nano aluminum oxide into the first mixture, and stirring to obtain a second mixture; adding 2-3 parts of polyoxyethylene, 0.4-0.5 part of citric acid, 2-4 parts of a coalescing agent and 0.5-1 part of a defoaming agent into the second mixture, and stirring to obtain a coating; s3, performing plasma activation on the PET film to obtain a pretreated PET film; and S4, uniformly coating the pretreated PET film with the coating, and curing to obtain the environment-friendly film coating. The ink-jet adhesive force is improved, and meanwhile, the mechanical property of a PET film coated with a coating is improved.

The invention discloses a preparation method and application of a fluorine-doped and carbon-coated synergistically modified lithium-rich manganese-based single-crystal positive electrode material based on PVDF (polyvinylidene fluoride). The preparation method comprises the following steps: S1, preparing a transition metal salt solution, a NaOH aqueous solution and a NH3.H2O solution; s2, the transition metal salt solution, NaOH and NH3.H2O solutions are pumped into a reaction kettle at the same time, the pH value of the reaction is controlled and kept at 11.0-11.2, and a [NixMny] (OH) 2 precursor is obtained; s3, pre-sintering the [NixMny] (OH) 2 precursor at the temperature of 500 DEG C; and S4, mixing the sintered [NixMny] (OH) 2 precursor with PVDF and a lithium source according to a stoichiometric ratio, and carrying out secondary roasting in a nitrogen atmosphere to obtain the F-doped lithium-rich manganese-based polycrystalline positive electrode material with relatively loose combination. S5, the prepared lithium-rich manganese-based polycrystalline positive electrode material is crushed in an airflow crusher, and the lithium-rich manganese-based monocrystalline positive electrode material Li < 1.2 > Ni < x > Mn < y > O < 2-x > F < x > (at) C with both carbon coating and fluorine doping is obtained; the prepared Li < 1.2 > Ni < x > Mn < y > O < 2-x > F < x > (at) C is used for preparing a positive pole piece, and the positive pole piece is applied to a lithium ion battery.

The invention relates to a PEM ternary alloy catalyst for water electrolysis hydrogen production and a preparation method thereof, and belongs to the technical field of water electrolysis catalysts. 1-butyl-3-methylimidazolium tetrafluoroborate is introduced in the generation of a carrier manganese dioxide to increase the specific surface area of the carrier, fluorine doping and oxygen vacancy construction are realized on the surface of the carrier through hydrofluoric acid treatment, and then a metal precursor is dispersed through an ethylene glycol / water system; and finally, loading and alloying of the alloy nanoparticles are completed through hydrothermal reduction and heat treatment. The morphology and electronic structure of the carrier are synergistically regulated and controlled through ionic liquid and fluorine doping, the specific surface area and active sites are remarkably increased, strong interaction of metal and the carrier is achieved through ternary alloy component optimization, and the oxygen evolution reaction activity and stability of the catalyst and the precious metal utilization rate are effectively improved.

The invention belongs to the technical field of new energy batteries, and particularly relates to a fluorine-doped graphdiyne material and a preparation method and application thereof. The preparation method of the fluorine-doped graphdiyne material comprises the following steps: in a solvent system, mixing graphdiyne and a solid fluorine source, and drying to obtain a composite precursor; under the protective atmosphere, the composite precursor is annealed, so that the fluorine source is decomposed to release hydrogen fluoride and fluorine free radicals, the hydrogen fluoride or the fluorine free radicals are combined with carbon sites on graphdiyne through nucleophilic substitution, C-F bonds are formed, and the fluorine-doped graphdiyne material is obtained; the mass ratio of graphdiyne to the solid fluorine source is 30: (1-4). The fluorine-doped graphdiyne has the advantages that the defects are increased, the disorder is reduced, and the lithium storage capacity of the graphdiyne is improved, so that the long-term cycle performance and the high-rate performance are improved.

A method of bonding substrates comprises depositing a fluorine-doped dielectric layer on a first substrate, exposing the fluorine-doped dielectric layer to a hydrogen-containing plasma, and directly bonding the fluorine-doped dielectric layer to a surface of a second substrate without the use of an intervening adhesive.

The invention belongs to the technical field of solid electrolytes, and relates to a fluorine-doped sulfide solid electrolyte with high ionic conductivity and stability, and a preparation method and application thereof. The fluorine-doped sulfide solid electrolyte has a chemical formula as shown in a formula I or a formula II: Li < 10-2x > Ge < 1-x > Sn < x > P2S < 12-2x > F < 2x > formula I, and x is more than 0 and less than 1; li < 6 + / -3y > P < 1-y > Sn < y > S5Cl < 1-2y > F < 2y > formula II, and y is more than 0 and less than 1. A fluorine source for preparing the fluorine-doped sulfide solid electrolyte is SnF2. According to the sulfide solid electrolyte and the preparation method thereof, SnF2 is taken as a fluorine source, fluorine is introduced, the prepared sulfide solid electrolyte has wet air stability and lithium metal stability while high ionic conductivity is guaranteed, and an assembled all-solid-state battery shows excellent cycling stability.

The invention discloses carbon-coated lithium manganese iron phosphate as well as a preparation method and application thereof, and belongs to the technical field of battery positive electrode materials. A preparation method of carbon-coated lithium manganese iron phosphate comprises the following steps: S1, mixing and dispersing a manganese source, an iron source, a lithium source, a phosphorus source and a carbon source, grinding, spray-drying and sintering to prepare carbon-coated lithium manganese iron phosphate; and S2, ammonium fluoride and the carbon-coated lithium manganese iron phosphate obtained in the step S1 are sequentially subjected to low-temperature fluorination sintering treatment and high-temperature defluorination sintering treatment. According to the preparation method, the carbon coating layer is modified through fluorine doping subjected to low-temperature fluorination sintering treatment in the step S2, so that the electronic structure distribution and the conductivity of the material are regulated and controlled, and the doped fluorine atoms leave the system in a fluorine gas form through fluorine-doped defluorination sintering treatment at a high temperature; and then proper sintering is performed to accelerate polymerization and heal excessive defect sites, so that the specific surface area of the material is reduced, and controllable adjustment of the specific surface area of the material is realized.

The application discloses a kind of detection pesticide water amitraz integrated organic photoelectrochemical transistor sensor construction method.The application is integrated on the same fluorine-doped tin oxide conductive glass chip by laser etching technology to have the gate, source, drain three electrodes of organic photoelectrochemical transistor.In order to improve the activity and stability of grating material, the method of encapsulating Pd NPs in Cu-MOF and pyrolyzing is adopted, and Pd NPs / p-Cu-MOF is formed.Pyrolysis Cu-MOF with three-dimensional MOF structure as active carrier can load more Pd NPs, and the redox active copper metal elements contained therein will cause electron transfer between carrier and Pd NPs, so as to adjust the electronic state of metal active site and improve its catalytic performance.Schottky junction is formed between Pd NPs and p-Cu-MOF, which promotes the separation of electrons and holes.Pd NPs / p-Cu-MOF is used as photoactive gate material, and amino amitraz aptamer with carboxyl on the material is used as recognition element, so as to realize the OPECT sensing detection of ICP.

Provided is a catalyst for an oxygen evolution reaction in a water electrolysis cell, the catalyst comprising: water electrolysis catalyst particles containing a noble metal oxide; and a conductive additive containing a fluorine-doped metal oxide, wherein in the entire fluorine-doped metal oxide, the content of fluorine is 1 at% to 10 at% relative to a total of 100 at% of the components as measured by X-ray photoelectron spectroscopy (XPS).

The invention provides a lithium ion battery positive electrode material with high interface conductivity and a preparation method thereof, and belongs to the technical field of new energy battery electrode materials. The preparation method of the lithium ion battery positive electrode material comprises the following steps: under the protection of nitrogen, reacting a metal salt solution containing nickel, cobalt and manganese with a precipitator and a complexing agent to synthesize a compact spherical NCM precursor; the preparation method comprises the following steps: uniformly ball-milling NCM, LiOH.H2O, LiF and absolute ethyl alcohol, and carrying out densification sintering to obtain fluorine-doped NCM powder; the preparation method comprises the following steps: mixing LiNO3, NH4H2PO4, urea and deionized water to prepare a precursor solution, uniformly loading the precursor solution on fluorine-doped NCM powder by adopting a rotary evaporation method, and carrying out heat treatment to obtain a lithium phosphorus oxygen nitrogen glass phase coated fluorine-doped NCM composite material; and dispersing the carboxylated multi-walled carbon nanotubes in absolute ethyl alcohol, adding the LiPON coated fluorine-doped NCM composite material and phenolic resin, and carbonizing to obtain the positive electrode material. The obtained lithium ion battery positive electrode material has high interface conductivity, and the long cycle life is remarkably prolonged.

The invention discloses a fluorine-doped alpha-type manganese dioxide nanotube, a preparation method thereof and application of the fluorine-doped alpha-type manganese dioxide nanotube as a thallium adsorption material, and belongs to the technical field of thallium wastewater treatment. A manganese source solution, a fluorine source solution and an inorganic acid are mixed and then subjected to a hydrothermal reaction, and the fluorine-doped alpha-phase manganese dioxide nanotube is obtained, has the advantages of being large in specific surface area, developed in pore structure, rich in surface active sites and the like, can be used as a thallium adsorption material for repairing thallium-polluted water, can quickly, efficiently and selectively remove thallium ions in wastewater, and has a good application prospect. And the purpose of water purification is achieved.

The invention provides a light emitting diode and a preparation method thereof. The light-emitting diode comprises an epitaxial structure and a transparent conductive layer, the transparent conductive layer is arranged on the surface of the epitaxial structure, the transparent conductive layer comprises a first transparent conductive sub-layer, a second transparent conductive sub-layer and a third transparent conductive sub-layer which are sequentially stacked on the epitaxial structure, the first transparent conductive sub-layer is an ITO layer, the second transparent conductive sub-layer is a hydrogen and fluorine doped indium oxide layer, and the third transparent conductive sub-layer is an ITO layer. According to the double-ITO transparent conductive layer, the production cost is reduced, and good light transmission and conductivity are provided.

The application provides a fluorine-doped Fe-N-C composite material and a preparation method and application and regeneration thereof, and belongs to the technical field of water pollution. In the application, an iron precursor, a zinc salt, an organic ligand and an organic solvent are mixed to synthesize Fe-doped metal organic framework Fe@ZIF-8 material, and then the Fe@ZIF-8 material is carbonized into Fe-N-C material; then the Fe-N-C material is mixed with a fluorine source and subjected to secondary carbonization to obtain the fluorine-doped Fe-N-C composite material. In the application, fluorine atoms are introduced into the Fe-N-C material to produce axial coordination with Fe of the FeN4 center, the fluorine element with high electronegativity can effectively improve the isoelectric point of the Fe-N-C material, the reaction activity of the material is enhanced, the Fe leaching of the material in the reaction process is inhibited, and the stability of the material is improved. In addition, the prepared fluorine-doped Fe-N-C composite material can be reused through fluorine-doping regeneration, and high reduction activity and stability can be maintained.

The invention discloses a fluorine-containing high polymer carbonized and coated silicon-carbon negative electrode material and a preparation method thereof. The silicon-carbon negative electrode material comprises a silicon-carbon material serving as a core and a coating layer serving as a shell and coating the surface of the silicon-carbon material, wherein the coating layer is formed by carbonizing a fluorine-containing high polymer layer; the fluorine-containing high polymer layer is obtained by coating the surface of the silicon-carbon material with a fluorine-containing micromolecular monomer through in-situ polymerization, or obtained by directly coating the surface of the silicon-carbon material with a fluorine-containing high-molecular polymer, or obtained by coating the surface of the silicon-carbon material with the fluorine-containing micromolecular monomer and a copolymer monomer through in-situ copolymerization. According to the fluorine-containing high polymer carbonized and coated silicon-carbon negative electrode material provided by the invention, the surface of the silicon-carbon material is secondarily coated with the fluorine-doped carbon layer (coating layer), so that the problem that the existing secondarily coated carbon layer can hinder ion transmission of the silicon-carbon material and influence the rate capability can be solved.

An electrode which includes nanoparticles of a carbon-doped tin oxide of formula C—SnO2-x where x=is from 0.001 to 0.1, having surface oxygen vacancies. The electrode includes a fluorine-doped tin oxide substrate. A film of the nanoparticles is present on at least one surface of the fluorine-doped tin oxide substrate. The surface oxygen vacancies correspond to an O 1s peak shift of 0.5-2 eV in the X-ray photoelectron spectroscopy (XPS) for C—SnO2-x compared to C—SnO2 without surface oxygen vacancies.

The present invention relates to a method for preparing a fluorine-doped Mo₂C nanocatalyst on a nitrogen-carbon nanosheet. This method uses a simple two-step pyrolysis method. First, two molybdenum sources are introduced, and MoO₃: ammonium molybdate = 1: (2-2.5). Then, ammonium fluoride (NH₄F) and molybdenum-dopamine (Mo-PDA) are uniformly mixed by solid-phase grinding. After calcination, the anion fluorine is doped into molybdenum carbide and modifies it, and then the fluorine-doped Mo₂C nanocatalyst on the nitrogen-carbon nanosheet can be obtained. The catalyst obtained by the present invention has higher catalytic activity, cyclic stability and hydrogen production efficiency in the reaction of electrolyzing water under alkaline conditions, and has the advantages of simple synthesis process, simple operation and short synthesis cycle.

The invention provides a middle-infrared-band low-infrared-emissivity material and a preparation method thereof. The middle-infrared-band low-infrared-emissivity material comprises a low-emissivity composite layer, an anti-rust paint layer and a base layer which are sequentially connected. The low-emissivity composite layer is one of a first low-emissivity layer, a second low-emissivity layer and a second low-emissivity layer; the raw material of the first low-emissivity layer is one or more of polyurethane resin, fluorocarbon resin and epoxy resin; the raw material of the second low-emissivity layer is one of a conductive film and compound slurry; the conductive thin film is one or more of antimony-doped tin oxide, fluorine-doped tin oxide, indium tin oxide, aluminum-doped zinc oxide and a silver nanowire transparent thin film. The polyurethane resin provided by the invention can reduce the introduction of oxygen-containing functional groups, so that the polyurethane resin has lower emissivity and good light transmittance in the wave band of 8-14 microns, and the low emissivity of the material can be controlled by regulating and controlling the thickness of the polyurethane resin layer.

Described, herein, relates to a fluorinated electrocatalyst and a method of optimizing a catalytic reaction within an electrochemical cell, in which fluorine atoms may be introduced to the local coordination environment sites to weaken the carbon-nonmetal bonds and drive the nonmetallic chemical elements towards metallic chemical elements. The method may include introducing fluorine atoms to the metal-nonmetal-carbon catalysts to occupy the LCE site within the catalysts in order prevent the nonmetallic chemical elements from occupying the LCE sites, thereby driving the nonmetallic chemical element to form a nonmetallic chemical element layer on a surface of the metallic chemical elements. The nonmetallic chemical element layer may also inhibit the agglomeration and migration of the metallic chemical elements about the LCE site, optimizing catalyst activity through the regulation of the LCE site. The resulting fluorine-doped high-performance catalysts may be usable within electrochemical cells, with long-term stability and reduced degradation.

A method for preparing a perovskite solar cell using liquid crystal dynamic transition spontaneous interface healing, comprising: selecting fluorine-doped tin oxide glass as a glass substrate, generating an electron transport layer on the glass substrate by chemical bath deposition; dissolving a functionalized liquid crystal material in a mixed solution of N,N-dimethylformamide and dimethyl sulfoxide, stirring and dissolving to obtain a liquid crystal additive solution; mixing PbI2, NH2CH=NH2I, CH3NH3Br, and CsI and dissolving them in the liquid crystal additive solution to obtain a perovskite precursor solution containing the liquid crystal additive; applying the perovskite precursor solution to the electron transport layer of the glass substrate by spin coating to form a perovskite absorption layer; applying a Spiro-OMeTAD solution to the perovskite absorption layer of the glass substrate by spin coating to form a hole transport layer; and generating an electrode by evaporation on the hole transport layer of the glass substrate to obtain a perovskite solar cell. The present invention effectively improves the crystallization quality of the perovskite film and the electron extraction capacity at the interface between the perovskite and the electron transport layer.

The invention discloses a glass fiber surface low-k SiOF coating based on a sol-gel and ultraviolet curing synergistic technology and a preparation method of the glass fiber surface low-k SiOF coating. According to the method, a sol-gel technology, a fluorine doping technology and an ultraviolet curing technology are creatively combined, and a compact, uniform and high-binding-force fluorine-doped silicon oxide coating with a low dielectric constant is constructed on the surface of the glass fiber. The dielectric constant of the coating at 10GHz is epsilon < lt >; 3.5, the dielectric loss tan [delta] lt; 0.005, the water contact angle gt; the temperature is 100 DEG C, and the water absorption is 1t; and the performance change rate is less than 10% after 96h of 85 DEG C / 85% RH aging. The invention solves the problems of high temperature, large energy consumption and easy fiber damage in traditional thermocuring, provides a low-temperature efficient surface modification technology which can be integrated with a glass fiber drawing process on line, and is suitable for the advanced electronic packaging field of high-frequency printed circuit boards and the like.

This invention proposes a nano-transparent semiconductor electrothermal structure, its fabrication method, and a semiconductor electrothermal module. The nano-transparent semiconductor electrothermal structure comprises, from bottom to top, a first insulating layer, a substrate, an electrothermal layer, a second insulating layer, and electrodes. Both the first and second insulating layers are nanoscale insulating films formed by pulsed radio frequency synergistic physical vapor deposition of hexagonal boron nitride. The first insulating layer is formed on the back side of the substrate, and the second insulating layer is formed above the electrothermal layer. The electrothermal layer is a nanoscale electrothermal conversion film formed by aluminum-doped zinc oxide, tin-doped indium oxide, and fluorine-doped tin oxide containing yttrium trioxide. At least one of tantalum, beryllium, and niobium is embedded in the lattice gaps of the electrothermal layer. The electrothermal layer is used for electrothermal conversion when energized. Electrodes are disposed on both sides of the electrothermal layer, and the electrodes are in contact with the electrothermal layer and connected to a power source. This invention adds a first insulating layer to the back of the substrate, which, together with the second insulating layer above the heating layer, forms a double-sided hexagonal boron nitride insulating protection structure. This effectively blocks leakage paths on the back of the substrate, improving safety. At the same time, the double-sided high thermal conductivity insulating layers balance the thermal resistance on both sides of the substrate, improving heating uniformity. The two equal-thickness thin films ensure symmetrical stress on both sides of the substrate, preventing warping and deformation. The heating layer uses pulsed radio frequency synergistic physical vapor deposition to improve film uniformity. Moreover, the use of hybrid deposition reduces the indium content while still achieving a better-performing heating layer.

The present invention provides a modified lithium-rich manganese-based positive electrode material, a preparation method thereof, and an application thereof. The preparation method of the modified lithium-rich manganese-based positive electrode material comprises the following steps: impregnating the lithium-rich manganese-based positive electrode material with a fluorocarbon surfactant and annealing at high temperature to obtain the modified lithium-rich manganese-based positive electrode material; the modified lithium-rich manganese-based positive electrode material is prepared by the preparation method of the modified lithium-rich manganese-based positive electrode material and is applied to the field of lithium-ion batteries. Compared with the prior art, the present invention not only retains the high theoretical specific capacity of the lithium-rich manganese-based positive electrode material itself, but also improves the surface stability of the material by fluorine doping the surface lattice of the material, thereby forming a modified lithium-rich manganese-based positive electrode material with excellent rate performance and more stable long-term cycle performance for application in the field of lithium-ion batteries. The preparation method is simple in process and highly operable.

The present invention discloses a split-type photoelectrochemical biosensing analysis method based on a Bi2S3 / Ag3PO4 heterojunction composite material. First, a Bi2S3 / Ag3PO4 heterojunction is prepared by multi-step hydrothermal method, and then modified on the surface of a fluorine-doped tin oxide electrode to form a Bi2S3 / Ag3PO4 photoelectrode; when a target is present, the capture aptamer on the surface of the magnetic bead can capture the triggering aptamer chain, thereby triggering the HCR reaction. With the help of the specific recognition effect between streptavidin and biotin, alkaline phosphatase is introduced on the surface of the magnetic bead to catalyze the substrate to form ascorbic acid as an electron donor, thereby enhancing the current. Carcinoembryonic antigen is quantitatively analyzed by photocurrent signal. This analysis method combines hybridization chain reaction and enzymatic signal amplification strategy, and has the advantages of simple preparation, high sensitivity, and reusability.

The application discloses an iridium oxide modified fluorine-doped tin oxide electrode and a preparation method and application thereof. The electrode comprises a light-transmitting fluorine-doped tin oxide conductive glass substrate and an in-situ attached iridium oxide nano-modified layer. The preparation method comprises the following steps: preparation and aging of a precursor solution, alternating current electrochemical deposition, annealing and cleaning, and laser patterning treatment. The application further discloses a cell impedance sensor organ chip system comprising the electrode and application of the system in in-vitro drug screening. The application utilizes the low cost and light-transmitting property of the fluorine-doped tin oxide and the excellent charge injection capacity of the alternating current deposited iridium oxide nano layer to greatly reduce the interface impedance. The scheme meets the in-situ optical observation, realizes the high-sensitivity biological impedance monitoring comparable to gold electrodes, effectively solves the problems of high cost and complex process of the existing organ chip electrode, and is very suitable for popularization and application as a disposable high-throughput consumable.

A fluorine-doped CD is synthesized through one-pot solvothermal synthesis as follows: dissolving 4-(diethylamino)salicylaldehyde and sodium fluoride in deionized water to produce an aqueous solution, and ultrasonically mixing the aqueous solution with phosphoric acid thoroughly to produce a mixture; placing the mixture in a reactor lined with polytetrafluoroethylene (PTFE), and allowing a reaction for 1 h to 3 h under heating at 180° C. to 220° C.; cooling, and conducting centrifugation to remove unreacted raw materials; collecting a resulting supernatant, and conducting dialysis in a dialysis bag for 24 h to 48 h to produce a sample; and lyophilizing the sample to produce the fluorine-doped CD. The fluorine-doped CD is adopted as a chromogenic agent to achieve the detection of PFCs, and accordingly, a enrichment chromogenic membrane is prepared in combination with UiO-66-F4. The enrichment chromogenic membrane allows convenient detection and can achieve the in-situ monitoring of three PFCs in water.