57 results about "Photoelectrochemistry" patented technology

This invention discloses an energy storage type TiO2 / CN X The photoanode of WO3 composite material and its preparation method include the following steps: preparing WO3 nanorods by hydrothermal method; adding WO3 nanorods and anionic surfactant to water, sonicating, adding pyrrole, stirring, and then adding an initiator solution dropwise under ice bath conditions, stirring, and obtaining WO3 / PPy composite after reaction; adding WO3 / PPy composite and anionic surfactant to an alcohol solution, sonicating and stirring, adding tetrabutyl titanate, glacial acetic acid and acetone, and then adding an aqueous alcohol solution dropwise, transferring to a hydrothermal reactor for reaction, obtaining precursor TiO2 / PPy / WO3 composite after hydrothermal reaction; loading the precursor TiO2 / PPy / WO3 composite onto a conductive substrate. TiO2 / CN X / WO3's excellent sustained photocathode protection performance can be attributed to the highly conductive CN X In synergy with WO3, a narrow-bandgap semiconductor with energy storage properties, TiO2 nanoparticles with stable photoelectrochemical properties serve as the main material, ensuring the stability of the photoelectric performance of ternary materials.

The present application relates to a kind of hAAG photoelectrochemical detection method based on sulfur vacancy engineering, belong to analytical detection technical field.The present application will prepare hairpin structure DNA to single-stranded DNA, sequentially join different concentrations of human alkyladenine DNA glycosylase (hAAG), endonuclease IV, exonuclease I and its reaction buffer;Dopamine solution is added to reaction, and the enzymatic reaction system of hAAG is obtained;CdZnS modified electrode is immersed in enzymatic reaction product solution and reacts, so that dopamine and zinc atom on the surface of CdZnS are combined by ortho-hydroxy coordination, and sulfur vacancy is induced to generate;Photoelectrochemical test is carried out to CdZnS modified electrode, the photocurrent signal is detected, the linear relationship between photocurrent signal and hAAG concentration is established, and the quantitative detection of hAAG is realized.The present application not only provides efficient strategy for hAAG detection, but also provides new ideas for performance optimization of sulfide-based photoelectrochemical device.

This invention belongs to the field of photoelectrode material preparation technology for photoelectrode fabrication in photoelectrochemical water splitting, specifically a preferred-oriented Ta3N5 photoanode and its preparation method. This method utilizes an electron beam evaporation system and a high-temperature nitriding method to form a specifically oriented Ta3N5 inducing layer on a Nb substrate, and then achieves the orientation-continuous growth of the main Ta3N5 thin film. By adjusting the type of metal material in the inducing layer, the preferred orientation of the Ta3N5 crystal planes can be controlled, thereby achieving the regulation of the photoelectrochemical water splitting performance of the Ta3N5 thin film. This method has good structural repeatability and can be extended to the growth of different substrates and other material systems.

This invention discloses a MIL-100(Fe)-CdS-sodium alginate composite film for long-term photocathode protection in seawater environments and its preparation method, belonging to the field of photocathode protection technology. The method includes the following steps: cleaning conductive glass; growing a MIL-100(Fe) thin film on the conductive glass using a hydrothermal method; growing a MIL-100(Fe)-CdS composite film on the surface of the MIL-100(Fe) thin film using a dip-coating method; and growing sodium alginate (SA) hydrogel on the surface of the MIL-100(Fe)-CdS using an in-situ drop-coating method. This invention utilizes the heterojunction of MIL-100(Fe) and CdS, and uses a loaded sodium alginate hydrogel as a protective layer, solving the problem of severe photoelectric conversion efficiency degradation in existing photoanodes during long-term seawater immersion. After coupling with a metal, the current generated under illumination causes cathodic polarization of the metal, and the hydrogel layer delays the loss of active materials. The synergistic effect of these two factors results in long-term stable photochemical cathodic protection performance in seawater environments.

This invention provides a method for synthesizing dimethyl carbonate, belonging to the field of carbonate compound synthesis technology. The synthesis method of this invention does not require high temperature and high pressure conditions, and can be carried out at room temperature and pressure, significantly reducing energy consumption and equipment requirements. By coupling the reduction and oxidation reactions of photoelectrochemical carbon dioxide conversion, the synthesis energy barrier of dimethyl carbonate is lowered, improving energy utilization efficiency. Using greenhouse gas carbon dioxide as the main raw material, waste resource utilization is achieved, and the energy used is clean energy such as solar or electrical energy, avoiding pollution at the source. This invention couples the carbon dioxide conversion and dimethyl carbonate synthesis steps, realizing the recycling of the reactant methanol within the system, simplifying the process flow. The combined use of light and electrical energy produces a synergistic effect, improving the reaction rate and the selectivity of dimethyl carbonate.

This invention provides an integrated photochargeable zinc-ion supercapacitor, comprising a photoelectric positive electrode, a zinc negative electrode, and a gel electrolyte. The preparation method involves: spraying a TiO2 colloidal solution onto FTO glass to form a TiO2 mesoporous film; then spraying an Ag-np@MXene colloidal solution onto it to obtain a TiO2 / Ag-np@MXene photoelectric positive electrode; fixing a zinc sheet onto the conductive surface of another FTO glass; and sequentially stacking the zinc sheet, gel electrolyte, and TiO2 / Ag-np@MXene photoelectric positive electrode fixed on the FTO glass, and encapsulating them to obtain the integrated zinc-ion photochargeable capacitor. This invention significantly enhances the pseudocapacitive performance of MXene through silver nanoparticles and utilizes the synergistic effect of Ag-np and TiO2 to enhance the electrochemical energy storage capacity under illumination. The energy level matching between the composite electrode materials achieves efficient separation and photoelectric conversion of photogenerated carriers. This photocharged zinc-ion capacitor exhibits excellent photoelectrochemical performance, with a significantly increased specific capacitance under illumination, maintaining good light-assisted energy storage performance at high current densities, and stable light gain capability after long-term cycling.

This invention relates to a transparent polishing pad for photoelectrochemical mechanical polishing (PECMP), its preparation method, and its application method. The polishing pad is made of a highly transparent silicone matrix with ultraviolet light transmittance, and nano-silica abrasive particles are uniformly dispersed within the pad, giving it both excellent light transmission and stable mechanical polishing capabilities. This enables effective synergy of optical, electrical, chemical, and mechanical multi-energy fields in semiconductor PECMP processes. The transparent pad has excellent ultraviolet light transmittance, allowing ultraviolet light to penetrate the polishing pad during processing, achieving in-situ photochemical irradiation and chemical etching of the workpiece surface processing area, effectively improving the chemical reaction rate of the workpiece. Furthermore, the nano-silica abrasive particles dispersed in the transparent polishing pad maintain optical path continuity while providing stable mechanical cutting micro-actions. The transparent polishing pad with abrasive properties can achieve a dynamic balance of chemical and mechanical properties across the entire processing surface, effectively improving polishing efficiency and uniformity.

The application belongs to the field of sensing detection, and relates to a method for rapidly detecting sulfur ions in a double channel, which uses tin telluride nanometer enzyme as a double channel colorimetric probe, detects sulfur ions through two channels, one channel is a specific brown change caused by the binding energy between tin ions and sulfur ions, and is used for detecting sulfur ions with a concentration of greater than or equal to 100 muM; the other channel is a TMB colorimetric method for detecting sulfur ions with a concentration of less than 100 muM; it is found for the first time that the double channel colorimetric probe tin telluride nanometer enzyme can be used for detecting sulfur ions, has high selectivity for sulfur ions, has super-high sensitivity, and is not easily disturbed by other ions; specific brown changes caused by the binding between tin ions and sulfur ions can realize the visualization of sulfur ions in a solution and the rapid, accurate and wide-range concentration determination of photoelectrochemistry; therefore, the method provides a new idea for a 'one platform and multiple channels' detection method of chemical and biological analysis.

This invention discloses a ZnCdS / APF composite photocatalyst, its preparation method, and its application, belonging to the field of photocatalysis technology. The composite photocatalyst uses a ZnCdS solid solution as the light-absorbing core and aminophenol-formaldehyde resin (APF) as the interface modification layer. The two are polymerized in situ to form a tight heterojunction. This invention uses zinc acetate, cadmium acetate, and thioacetamide as precursors to synthesize ZnCdS via ethylenediamine-assisted hydrothermal synthesis; then, using 3-aminophenol and formaldehyde as monomers, APF is grown in situ on the ZnCdS surface under ammonia catalysis, followed by washing and drying to obtain the final product. This preparation process is mild, requires no precious metals, and is easily scalable. The composite photocatalyst achieves a photocatalytic hydrogen peroxide production rate of up to 5318 μmol g under visible light irradiation and an oxygen atmosphere. ‑1 h ‑1 Compared to pure ZnCdS (2983 μmol g), ‑1 h ‑1 The photocatalyst exhibits a 78.3% improvement in light absorption capacity, carrier separation efficiency, and photoelectrochemical performance, all significantly superior to the pure-phase material. Characterization results, including SEM, UV-vis DRS, Mott-Schottky, EIS, and transient photocurrent response, confirm the synergistic enhancement effect of APF on ZnCdS. This composite photocatalyst shows broad application prospects in the green synthesis of H2O2.

The application provides a microfluidic sensor preparation method and application for myocardial infarction marker detection, belongs to the technical field of biosensors, realizes rapid, convenient and accurate detection of cTnI by organically combining photoelectrochemical detection technology, immunological recognition technology and a microfluidic chip platform, has high signal response, good repeatability and excellent anti-interference ability, provides a detection platform with broad application prospect for early diagnosis and dynamic monitoring of myocardial injury, and effectively solves the core pain points of complicated manual operation and long detection period in conventional immunological analysis, thereby providing a highly adaptive technical platform for rapid screening in a clinical scene.

The application discloses a BiVO4 / CoO x / VO2 / FeOOH photoanode composite material preparation method and artificial leaf device application, and belongs to the technical field of new energy materials. x By introducing CoO x and VO2 as a synergistic hole storage layer, the photoanode can realize effective storage and regulation of photo-generated holes in different potential intervals, thereby promoting the spatial separation of photo-generated carriers, inhibiting electron-hole recombination, and significantly improving the photocurrent density of the photoanode. x In addition, FeOOH is further introduced as an oxygen evolution assistant catalyst to improve the water oxidation reaction kinetics, and a BiVO4 / CoO x / VO2 / FeOOH composite photoanode is constructed. By integrating with a silicon photovoltaic cell, an artificial leaf device is formed, which exhibits excellent photoelectrocatalytic activity and long-term operation stability in the process of photoelectrochemical water splitting.

This invention relates to the field of photoelectrochemical technology, and in particular to a nickel-iron / sulfide composite photoanode activated by sacrificial nickel-triggered reconstruction, its preparation method, and its applications. This invention introduces a nickel-iron hydroxyl oxide layer onto the surface of an indium sulfide photoanode, utilizing the PEC activation process to trigger the selective leaching of sacrificial Ni components and surface porosification reconstruction. This drives deep chemical integration of Fe species with the sulfide substrate at the interface, forming stable Fe-S anchoring bonds. Under the synergistic effect of photoelectric bias and illumination, this structure can transform the originally weakly coupled static contact into an adaptive, strongly coupled catalytic interface in situ. While eliminating deep-level traps at the interface, it significantly increases the density of active sites and the interfacial hole transport dynamics, thereby significantly enhancing the current response and energy conversion efficiency of the photoanode in the photoelectrochemical water oxidation process.

The present invention relates to a thin film photovoltaic unit (100) and a photoelectrochemical module comprising such a photovoltaic unit. The present invention further relates to methods for forming such a photovoltaic unit and such a photoelectrochemical module and to a use of such a module. The photovoltaic unit (100) comprises a transparent substrate (120), at least two photovoltaic cells (111, 112, 1121, 1122), a front contact layer (125), an absorber layer (130) and a back contact layer (135). The photovoltaic unit (100) is divided into a first photovoltaic subunit (111) and a second photovoltaic subunit (112), each of which comprises one or more of the photovoltaic cells that are series connected with each other. In each photovoltaic subunit, the back contact layer (135) comprises a first region (1351) that is electrically connected with the front contact of one of the photovoltaic cells of the respective photovoltaic subunit, and a second region (1352) that serves as a back contact of one of the photovoltaic cells of the respective photovoltaic subunit. The first and the second photovoltaic subunits (111, 112) share a common first region (1351) of the back contact layer (135). A cathode (160) is electrically connected with the first region (1351) of the back contact layer, and an anode (170) is electrically connected with the second region (1352) of the back contact layer (135) within each photovoltaic subunit.

The application relates to the field of photoelectrochemical synthesis and catalysis, in particular to an In2O3 / ZnS heterojunction photoelectrocatalyst and biomass high-value conversion application thereof. The In2O3 / ZnS heterojunction photoelectrocatalyst is prepared by a hydrothermal method, the ZnS catalyst presents a nanosheet shape, the In2O3 catalyst presents a nanoparticle shape and is loaded on the ZnS nanosheet, and the In2O3 / ZnS heterojunction photoelectrocatalyst as a whole presents a spherical shape composed of many nanosheets. The In2O3 / ZnS heterojunction photoelectrocatalyst is applied to a photoelectrocatalytic reaction system for selectively synthesizing furfural, and an electrocatalytic reaction is carried out in a double-chamber electrolytic cell separated by a proton exchange membrane. The In2O3 / ZnS heterojunction photoelectrocatalyst with excellent selective oxidation capacity in the application can realize photoelectrocatalytic oxidation of furfuryl alcohol to produce furfural with high selectivity.

The application belongs to the technical field of nanomaterials and biological analysis, and particularly relates to a ratio type photoelectrochemical analysis method based on multifunctional CeO2 / CdS and interface etching. First, a multifunctional CeO2 / CdS nanocomposite is synthesized by an in-situ growth method, and the nanocomposite has photoelectric properties of CdS and CeO2 peroxidase activity; second, a beacon antibody labeled with nanogold and glucose oxidase is prepared by an electrostatic adsorption method, a target protein, the beacon antibody and an antibody coated on an enzyme-labeled microplate are mixed and incubated to form an immune complex, and after glucose is added, H2O2 is generated by catalysis of the glucose oxidase on the beacon antibody; the generated H2O2 is catalyzed by CeO2 in the CeO2 / CdS nanocomposite to generate hydroxyl radicals, and in-situ etching of CdS in the electrode interface reduces the photocurrent, and a photocurrent intensity ratio (Iw / Ic) of a double-channel electrode has a linear relationship with the concentration of the target protein, so that quantitative analysis can be realized. The application has a sensitive response to the detection of proteins and has a fast detection speed.

This invention belongs to the field of photoelectrochemical energy storage technology, specifically relating to a bromine-modified iron-bromine photoelectrochemical redox flow battery and its preparation method. The battery device of this invention comprises an anode cell, a PBVO electrode as the anode, a cathode cell, a graphite carbon felt electrode as the cathode, and a proton exchange membrane. A proton exchange membrane is fixed between the anode and cathode cells using a metal clamp. The anode cell contains a KBr solution containing tetraethylammonium bromide (TEAB) as the anolyte, and the cathode cell contains a FeCl3 solution as the cathode electrolyte. A light source illumination window is provided at the corresponding position of the anode, with backlighting. The anode includes conductive glass and a semiconductor thin film thereon. The anode is connected to the positive terminal of the power supply via a current collector, and the cathode is connected to the negative terminal of the power supply via a current collector. Compared with traditional systems, this invention's device has higher coulombic efficiency, and the charge / discharge mode can be switched by changing the photoanode, making it applicable to the field of photoelectrochemical redox flow batteries.

This invention relates to a photoanode material based on a porphyrin covalent organic framework@polyindolepentaformaldehyde, its preparation method, and its application, belonging to the field of photoelectrochemical biosensor technology. This invention uses Dha and Tph to synthesize D-T-COF via a solvothermal method, and modifies it onto the surface of an FTO conductive substrate; further, P5FIn is deposited via electropolymerization to form a uniform and widely distributed layer on the D-T-COF surface. p‑n Heterogeneous junction structure. Based on D-T-COF@P5FIn composite material and p-tau217 capture antibody, an opto-chemical immunosensor array capable of accurately identifying trace amounts of p-tau217 in human plasma was constructed. It has achieved significant breakthroughs in sensitivity, specificity and practicality, and is particularly suitable for the reliable detection of extremely low concentrations of biomarkers in complex biological matrices, showing broad prospects for clinical translational applications.

The application discloses a kind of multi-level hole titanium dioxide super particles and its preparation method and application, belong to porous material technical field, the super particle is composed of big hollow ball in center and small hollow ball distributed on its surface, big hollow ball pore size is 100-500nm, small hollow ball pore size is 50-200nm, small hollow ball shell layer is distributed with the spherical mesoporous of pore size 15-50nm, titanium dioxide shell layer thickness is 5-50nm, specific surface area reaches 100-300m 2 / g.Preparation method includes: preparing amino modification and sulfonation modification different size SiO2 Nanosphere template respectively, form multi-level hole template by electrostatic super assembly, then combine pore forming agent and titanium source coating, calcination and template removal etc., prepare the titanium dioxide super particle with hierarchical pore structure and uniform morphology.The material has high specific surface area and good mass transfer performance, suitable for photocatalysis, energy storage and photoelectrochemistry field, especially in photocatalytic carbon dioxide reduction and shows superior activity.

The application belongs to the technical field of photoelectrochemical sensors, and particularly relates to a preparation method of a novel photoelectrochemical sensor for simultaneously detecting micrometer and nanometer plastics based on a biosensing strategy, which comprises the following steps: S1, substrate cleaning: ITO conductive glass is sequentially placed in appropriate acetone, ethanol and deionized water for ultrasonic cleaning to remove contaminants such as grease and dust on the surface of the substrate, and the substrate is blown dry after cleaning; S2, ITO / BiOI nanometer array prepared by electrodeposition: an electrolyte containing Bi(NO3)3 and KI is prepared, and a BiOI nanometer array is prepared on the ITO conductive surface by using an electrodeposition method, the deposition voltage is-0.1V to-0.3V (vs. Ag / AgCl), and the deposition time is 1-5 min; by constructing a two-dimensional inorganic / organic van der Waals Z-type heterojunction (FeTCPP / BiOI), the separation of photoinduced electron-hole pairs is effectively promoted, the visible light absorption capacity is enhanced, the transient photoelectric value of ITO / BiOI / FeTCPP is 91.7 times and 7.4 times that of ITO / FeTCPP and ITO / BiOI respectively, and the photoelectric conversion efficiency is significantly improved.

The application belongs to the technical field of lithium metal batteries and photoelectrochemical energy storage, and discloses a starch-polyiodide composite solid electrolyte film and a preparation method thereof. The electrolyte film takes a polymer as a matrix, lithium bisfluorosulfonylimide and the like as a lithium salt, and a mixture of soluble branched starch, lithium iodide and iodine as a redox composite filler. Through the synergistic effect of the soft support effect of starch and the iodine-based redox pair, a uniform mixed conductive network is constructed, which can effectively reduce the interface impedance, inhibit the polymer crystallization, and significantly improve the ionic conductivity, lithium ion transference number and mechanical flexibility. The application further provides an integrated flexible photoelectrochemical energy storage battery device. The positive electrode-electrolyte integration is realized through an in-situ coating process, so that the device can still work stably under repeated bending and folding, and has high-efficiency light charging function, thereby providing a high-performance and high-safety solid electrolyte solution for the flexible light charging lithium metal battery.

The present application relates to the technical field of photoelectric corrosion protection, in particular to a W-WO3-TiO2 magnetron sputtering multilayer composite coating, a preparation method and application. The material comprises a three-layer composite coating from bottom to top in order, which is a tungsten transition layer, a tungsten trioxide layer and a titanium dioxide layer. A heterojunction structure is formed between the tungsten trioxide layer and the titanium dioxide layer. The present application realizes stress buffering and bonding force strengthening of the film-substrate interface through the tungsten transition layer, and realizes efficient separation of photo-generated electrons and dark state storage through the WO3 / TiO2 heterojunction, so that the coating has high film-substrate bonding strength and all-weather photoelectrochemical protection performance, and is suitable for long-term corrosion protection of metal components in marine high-salt fog and strong ultraviolet environment.

This invention belongs to the field of photoelectrochemical sensing materials technology, specifically relating to a composite material based on Sb₂S₃ / CaIn₂S₄, its preparation method, and its application. The composite material includes an ITO electrode and Sb₂S₃ / CaIn₂S₄ composited on its surface, wherein Sb₂S₃ and CaIn₂S₄ form a type II heterojunction. This invention also provides an in-situ hydrothermal preparation method for this composite material. By dividing the composite material into multiple regions using insulating stickers and assembling Au@LaNiO₃-Apt signal markers, an optically addressable photoelectrochemical sensor array can be obtained. This sensor array is used for high-throughput sensitive detection of acetamiprid. This invention effectively suppresses carrier recombination through the type II heterojunction, significantly enhancing the photoelectrochemical response and solving the problems of insufficient sensitivity and limited high-throughput detection capability of existing photoelectrochemical sensors.

This invention relates to a method for fabricating a gadolinium oxysulfate X-ray scintillation screen based on a silicon microchannel array, as well as the X-ray scintillation screen and its applications, belonging to the field of X-ray imaging technology. It primarily addresses the technical problem of low resolution in existing X-ray scintillation screens. This invention fabricates a tetragonal silicon microchannel structure through photolithography, photoelectrochemical etching, and back-side thinning processes, fundamentally avoiding the problem of microchannel misalignment. The use of ALD tungsten film deposition and pulse electroplating for silver film deposition effectively reduces X-ray crosstalk. Furthermore, the good chemical compatibility between tungsten and silver ensures uniform silver film deposition without microchannel blockage, and the silver film possesses high reflectivity. Vacuum infusion is used to completely fill the microchannels with fluorescent material, avoiding the presence of air or other substances with significantly different refractive indices from the fluorescent material within the channels, and also solving the scattering and reflection problems caused by gaps between particles, effectively improving detection efficiency.

The application belongs to the technical field of biological detection, and relates to a homogeneous photoelectrochemical sensing platform and application thereof.The homogeneous photoelectrochemical sensing platform comprises a PyTTA-HOF / MXene modified working electrode, a magnetic signal transduction probe, a hairpin DNA, a primer RNA, a Cas12 enzyme and a buffer solution.The application combines the homogeneous amplification driven by the CRISPR / Cas12a system trans-cleavage with the excellent hydrogen peroxide PEC response of the PyTTA-HOF / MXene photoelectrode, and utilizes the gold nanoparticle loaded GOx to construct a "signal opening" PEC label, realizes the super-sensitive detection of human papilloma virus nucleic acid, avoids the complicated electrode modification step, and can be extended to other biomarkers by replacing the hairpin probe recognition domain, and has the advantages of high sensitivity, simple operation and universality.

The application belongs to the technical field of photoelectrochemical water splitting photoelectrode material preparation, in particular to a Ta3N5 film with large grain size and a preparation method and application thereof. 11 An intermediate phase is first constructed by combining an electron beam evaporation system with argon annealing treatment, and then high-temperature nitriding is performed under an ammonia atmosphere to convert the intermediate phase into a Ta3N5 film with large grain size. Compared with the prior art, the application significantly increases the grain size in the film, effectively reduces the grain boundary density, and has good process controllability and repeatability, and is widely applicable to various common substrates.

The application provides a photoelectrochemical detection system and method, which obtains a photocurrent autocorrelation coefficient by autocorrelation testing of an initial photocurrent signal, obtains a photocurrent oscillation correlation coefficient by differential correlation testing of a low-frequency oscillation photocurrent signal segment set, extracts a photocurrent increment feature from the low-frequency oscillation photocurrent signal segment set by an oscillation frequency period when the photocurrent oscillation correlation coefficient is higher than the photocurrent autocorrelation coefficient, corrects the initial photocurrent signal according to the photocurrent increment feature to obtain a photocurrent detection signal, and analyzes the photocurrent detection signal to obtain a photoelectrochemical detection result, which can correct the detection photocurrent according to the photocurrent increment feature under a low-frequency oscillation period, thereby reducing random environmental interference on the photocurrent signal and improving the accuracy of the photoelectrochemical detection result.

This invention relates to the field of metal-organic framework (MOF) functional materials technology, specifically to a plasmonic MOF composite catalyst, its preparation method, and its application. The composite catalyst has a core-shell structure, comprising: a core containing gold nanoparticles exhibiting plasmonic effects; a shell coating the surface of the core, comprising a zinc-containing MOF material; and metal ions introduced and loaded into the zinc-containing MOF material via bridging molecules, wherein the bridging molecules are small organic molecules containing -NH2 groups. This invention effectively overcomes the electrostatic repulsion effect caused by the electropositivity of the zinc-containing MOF surface through the coordination interaction between the -NH2 groups in the bridging molecules and the metal ions, achieving effective introduction of metal ions within the framework. The resulting composite catalyst exhibits excellent catalytic activity and selectivity in the photoelectrochemical reduction of nitrate to ammonia.

This invention relates to a photoelectrochemical synaptic device based on halogen-passivated quantum dots and its construction method, belonging to the field of artificial neuromorphic visual system technology. The method includes the following steps: synthesizing copper indium selenide sulfide (CISS) quantum dots; synthesizing CISS / zinc sulfide quantum dots; synthesizing a series of surface ligand-exchanged CISS / zinc sulfide quantum dots; preparing a series of novel quantum dot-sensitized photoanodes and assembling them into a photoelectrochemical synaptic device; this invention also includes CISS / zinc sulfide-halogen bromine ligand-passivated quantum dot materials, and photoelectrochemical synaptic devices using these materials as photoanodes. The beneficial effects of this invention are: inspired by the chemical regulation mechanism of transmembrane receptors in biological synapses, by introducing surface ligand exchange strategies such as halogen bromine ligands as a biomimetic strategy, the surface of quantum dots is chemically modified, and the separation / transfer efficiency of photogenerated excitons within the quantum dots is rationally regulated, effectively solving the problems of rapid recombination of electrons and holes and low photoelectric conversion efficiency in traditional quantum dots, thereby endowing photoelectrochemical synaptic devices with receptor-like regulatory capabilities.

This invention belongs to the fields of immunoassay and biosensing technology, and provides a method for preparing an "on-off-on" type PEC sensor regulated by a Ferris wheel-shaped DNA structure. First, a CoS / CoCdS heterojunction with a "self-sensitization" effect is generated in situ as a photoelectric substrate to provide an initial "on" signal. Subsequently, triggered by the target analyte MC-LR, a Ferris wheel-shaped DNA structure with steric hindrance effect is formed through a DNA cascade reaction. This structure acts as a steric hindrance layer covering the electrode surface, hindering electron transfer and causing the signal to briefly switch to an "off" state. By specifically modifying AgInS2 QDs at the ends of the DNA Ferris wheel-shaped structure and constructing a ternary heterojunction using the band-matching principle, a clear signal switching from "off" to "on" is achieved, thus enabling highly sensitive detection of MC-LR. Detection of MC-LR is achieved based on the different photoelectrochemical signal intensities for different concentrations of the analyte.

This invention discloses a PSA detection method based on a black phosphorus / bismuth vanadate composite material, comprising: S1, coating a microplate with a PSA monoclonal antibody, blocking it, adding the PSA sample to be tested and incubating it, then incubating it with a PSA polyclonal antibody, a thiolized oligonucleotide sequence 1, and a gold nanoparticle conjugate to form a sandwich immune complex; S2, adding a circular DNA template, DNA ligase, and other reagents, and incubating to complete RCA amplification; S3, adding a thiolized oligonucleotide sequence 2 and a conjugate with alkaline phosphatase, and adding a substrate for hydrolysis to generate ascorbic acid; S4, using a biosensor to perform photoelectrochemical testing under simulated sunlight and voltage, recording the oxidation current signal to quantify the PSA concentration. The PSA detection method disclosed in this invention, using a biosensor modified with this composite material and employing a signal amplification strategy, achieves highly sensitive and stable detection of PSA, which has significant clinical implications for the early diagnosis of prostate cancer.