443 results about "Nanoclusters" patented technology

The object of the present invention is to provide a flexible OECT non-enzymatic glucose sensor and a preparation method thereof, belonging to the technical field of glucose electrochemical sensors. The sensor uses a chemically modified laser-induced graphene (LIG) electrode as the gate, and gold nanoclusters (AuNC) are modified on the LIG through controllable in-situ electrochemical reduction; at the same time, by utilizing the pH-dependent conductivity of PEDOT:PSS, the self-calibration of the sensor of the present invention to the pH change of human sweat is realized, thereby reducing interference and improving the measurement accuracy. The flexible non-enzymatic glucose sensor designed by the present invention has the advantages of high detection sensitivity, low detection limit, excellent long-term stability, and being unaffected by pH value fluctuations, and can be widely applied to the field of wearable electronics.

The invention relates to the technical field of catalysts, in particular to a plasma silver nanocluster coated mesoporous molecular sieve TS-1 photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: 1, synthesizing mesoporous molecular sieve TS-1 powder; and 2, mixing the mesoporous molecular sieve TS-1 and CH3OH to prepare a suspension, injecting an AgNO3 aqueous solution into the suspension, and carrying out ultraviolet irradiation, filtration, washing and freeze drying to obtain the plasma silver nanocluster coated mesoporous molecular sieve TS-1 photocatalyst. The obtained electron-rich Ag cluster / mTS-1 shows an Ag-Ag coordination number (CN = 2.0 + / -0.1) lower than that of a mesoporous molecular sieve TS-1 (CN = 2.9 + / -0.2) loaded with Ag nanoparticles, so that the electron-rich Ag cluster / mTS-1 has higher CO2 adsorption and activation performance. In addition, the silver nanoclusters are firmly anchored on the surface of the mesoporous molecular sieve TS-1, so that the mesoporous molecular sieve TS-1 has high stability, and therefore, the mesoporous molecular sieve TS-1 shows high-stability CO2-to-CO photocatalytic conversion activity under simulated sunlight irradiation, and the yield of CO within 4 hours is 350 [mu] mol g <-1 >.

The invention relates to a preparation method of a microwave-assisted synthesized near-infrared electrochemical luminescence gold nanocluster and application of the gold nanocluster in miRNA (micro Ribonucleic Acid) detection. The preparation method comprises the following steps: under a stirring condition, adding a gold source and alkali into a Met solution to obtain a mixed solution, carrying out microwave irradiation reaction, and carrying out solid-liquid separation to obtain a Met-Au NCs solution; the preparation method comprises the following steps: activating a Met-Au NCs solution by using EDC and NHS, adding a DNA solution, mixing, and dialyzing to obtain a Met-Au NCs-DNA compound, namely the near-infrared electrochemical luminescence gold nanocluster. Compared with Au NCs prepared by a common mild method, the Met-stable Au NCs prepared by a microwave-assisted method has the advantage that the fluorescence and electrochemical luminescence efficiency at 835 nm is improved. The invention also provides a'signal closing 'ECL (electron cyclotron ligand) biosensor for high-sensitivity detection of the miRNA-107 (MicroRNA-107), and a method for detecting the miRNA-107 (MicroRNA-107). The sensor is simple to operate and good in repeatability, and has important scientific significance and application value for clinical early diagnosis of cancers.

The invention relates to the field of agricultural protection preparations, in particular to preparation of gold nanoclusters and application of the gold nanoclusters to prevention and treatment of plant parasitic nematodes. The invention provides a preparation method of a gold nanocluster, which comprises the following steps: preparing by using HAuCl4 and L-His to obtain an L-type histidine modified gold nanocluster; the preparation method comprises the steps that a HAuCl4 aqueous solution and an L-His aqueous solution are evenly mixed and then incubated, an obtained reaction solution containing L-His-AuNCs is centrifuged and then subjected to aftertreatment such as ultrafiltration, and the gold nanocluster is obtained. The gold nanocluster can be used for preventing and treating pine wood nematodes.

The invention discloses a phosphatidylcholine gold nano CT (Computed Tomography) probe as well as a preparation method and application thereof, and belongs to the technical field of medical materials. The preparation method comprises the following steps: step S1, preparing a phosphatidylcholine ligand NH2-MPC; step S2, synthesis of a gold nanocluster GS-Au25 is carried out; and S3, the GS-Au25 is modified with a PC ligand, and the PC-Au25 is prepared. The ultra-small gold nano CT probe PC-Au25 with an Au25 gold nano cluster as a core and phosphatidylcholine PC as a surface ligand is obtained by optimizing and screening the core size and the surface ligand property of ultra-small gold nano particles. Wherein the 2-methacryloyloxyethyl phosphorylcholine is used as a PC ligand for the first time to modify the surfaces of the ultra-small gold nanoparticles, so that the surface modification of the ultra-small gold nanoparticles is realized, and the ultra-small gold nanoparticles can be efficiently and freely filtered through the kidney. The CT probe can be applied to the determination of the glomerular filtration rate through a CT imaging or blood test method.

The invention relates to the technical field of battery negative electrode materials, and discloses a biomass derived carbon material as well as a preparation method and application thereof. The surface of the biomass derived carbon material is loaded with nano-clusters or nano-particles of a metal simple substance or a metal compound. The preparation method comprises the following steps: mixing a biomass precursor and a metal salt, and carrying out one-step pyrolysis to obtain the biomass derived carbon material. The biomass derived carbon material can be used as an alkali metal ion battery negative electrode material. Through the unique technical means of loading the metal simple substance / metal compound with the nano-cluster or nano-particle form on the surface of the biomass charcoal, the fast charging performance of the negative electrode material is practically and effectively improved. The battery prepared from the negative electrode material shows excellent comprehensive performance, and has excellent key performance indexes such as charge-discharge efficiency, cycle stability and energy density.

The invention provides an Au nanocluster-Cu monatomic / titanium dioxide photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalysis. According to the invention, the Cu monatomic atom is used as a catalyst for hydrogen evolution reaction, the Cu monatomic atom and the Au nano-cluster are loaded at the same time, the Cu monatomic atom can be used as an electron transport bridge to regulate the electronic structure of the Au nano-cluster, the synergistic effect of the Cu monatomic atom and the Au nano-cluster is realized, the catalytic activity is regulated and controlled together, and efficient series connection of multi-step reaction is realized; therefore, the product selectivity can be accurately regulated and controlled; the catalytic oxidation reaction can be dynamically adjusted through carrier mediation or direct contact by virtue of the electron interaction between the Cu monatomic and the Au nano-cluster, so that the electron distribution in the catalytic process is favorably optimized, the reaction energy barrier of C-C bond breakage and hydroxymethyl oxidation is regulated and controlled, and the dynamic performance of generating GA and hydrogen through photocatalytic oxidation of EG is improved.

The invention aims to provide a flexible OECT non-enzymatic glucose sensor and a preparation method thereof, and belongs to the technical field of glucose electrochemical sensors. According to the sensor, a chemically modified laser-induced graphene (LIG) electrode is used as a grid electrode, and gold nanoclusters (AuNC) are modified on LIG through controllable in-situ electrochemical reduction; meanwhile, the pH-dependent conductivity of PEDOT: PSS is utilized to realize the self-calibration of the sensor to the pH change of human sweat, so that the interference is reduced, and the measurement accuracy is improved. The flexible non-enzymatic glucose sensor designed by the invention has the advantages of high detection sensitivity, low detection limit, excellent long-term stability, no influence of pH value fluctuation and the like, and can be widely applied to the field of wearable electronics.

The invention belongs to the technical field of waterborne polyurethane, and discloses photo-thermal antibacterial, self-enhanced and self-healing vegetable oil-based waterborne polyurethane. The high-temperature-resistant polyurethane elastomer is prepared from a system consisting of the following raw materials in parts by weight: 80 to 120 parts of castor oil, 60 to 80 parts of dicyclohexylmethane diisocyanate, 20 to 40 parts of hexamethylene diisocyanate, 20 to 40 parts of N-methyldiethanolamine, 20 to 50 parts of protocatechuic acid, 2 to 10 parts of metal ions, 2000 to 3000 parts of water and 0.5 to 1 part of a catalyst. Metal ions in the photo-thermal antibacterial, self-enhanced and self-healing plant oil-based waterborne polyurethane and phenolic hydroxyl groups in protocatechuic acid are coordinated and self-assembled to form metal nanoclusters, and the waterborne polyurethane material has self-enhanced and self-healing properties due to a low-bond-energy coordination aggregation state structure; meanwhile, the waterborne polyurethane film is endowed with photo-thermal antibacterial performance by the metal nanoclusters. The invention further discloses a preparation method and application of the photo-thermal antibacterial, self-enhanced and self-healing plant oil-based waterborne polyurethane.

The invention discloses a method for detecting glucose on the basis of cascade catalysis of cerium dioxide / gold nano cluster-Prussian blue nano enzyme (AuNCs-CeO-HMPB). The material is prepared by compounding cerium dioxide (CeO) with similar glucose oxidase activity and hollow Prussian blue nanoparticles (AuNCs-HMPB) modified by gold nanoclusters with similar peroxidase activity through a hydrothermal assembly method. In the presence of glucose, CeO catalyzes oxidation of glucose to generate gluconic acid and H2O2, then AuNCs-HMPB synergistically catalyzes decomposition of newly generated H2O2 to generate high active oxygen species, further a colorless 3, 3 ', 5, 5'-tetramethyl benzidine (TMB) color developing agent is oxidized to generate obvious color change, and based on the cascade catalytic reaction, the enzyme-free glucose colorimetric sensor is successfully constructed. The sensor shows excellent detection performance on glucose under optimized conditions (pH = 4.0, 50 DEG C), the linear detection range is 10.00-90.00 [mu] mol / L, and the detection limit is 2.1 [mu] mol / L (S / N = 3).

The invention discloses a DNA silver nanocluster and a preparation method and application thereof, and belongs to the technical field of analytical chemistry. The method comprises the following steps: adding a template containing a DNA sequence and an AgNO3 solution into a PBS (Phosphate Buffer Solution), mixing, and carrying out a first dark reaction; then, adding a NaBH4 solution, and carrying out a second light-shielding reaction, so as to obtain the DNA-Ag NCs fluorescent probe; the DNA silver nano-cluster is applied to the determination of the cationic surface active agent; the fluorescence quenching effect is remarkable, the lowest detection limit can reach 2.0 mu M, the selectivity is good, common anionic surfactants, nonionic surfactants, metal ions in sewage and other interferents do not affect detection, and the accuracy and reliability of the method are improved.

The present invention provides a nanoparticle loaded with a photosensitizer Ce6 and targeting mitochondria of breast cancer cells, and a preparation method therefor and a use thereof. The nanoparticle uses hollow mesoporous silica as a carrier; a photosensitizer Ce6 is loaded at the hollow position of the carrier; a red cell membrane is encapsulated outside the carrier; and one side of the carrier after being encapsulated by the red cell membrane is modified with a Pt nanocluster, and the other side of the carrier is modified with an LXL-1 aptamer and TPP. The present invention also provides a preparation method for the nanoparticle and a use of the nanoparticle in preparation of a drug for treating breast cancer.

The invention discloses a three-dimensional ordered macroporous nitrogen-doped carbon-loaded CoPt nanocluster material as well as a preparation method and application thereof. The method comprises the following steps: by taking a three-dimensional structure stacked by polymer microspheres as a template, firstly filling precursors 2-methylimidazole and cobalt nitrate in the three-dimensional template, then placing the three-dimensional template containing the precursors in a mixed solution of ammonia water and methanol for crystallization, and after crystallization, carrying out high-temperature pyrolysis, thereby obtaining the cobalt-based composite material. And finally, carrying out vapor deposition by using platinum acetylacetonate to obtain the three-dimensional ordered macroporous nitrogen-doped carbon-supported cobalt-platinum material. According to the invention, Co is presented as a nanocluster by using a template method and a pyrolysis method, and the nanocluster is anchored on a highly regular three-dimensional ordered macroporous nitrogen-doped carbon carrier; meanwhile, Pt introduced by vapor deposition brings a hydrogen overflow effect by activating hydrogen, so that the material shows excellent activity and selectivity in a carbon dioxide hydrogenation reaction and has a good application prospect.

The invention relates to a design method of a stainless steel-based natural seawater electrolysis high-efficiency catalyst, a catalyst and application thereof, and the design method comprises the following steps: taking a stainless steel mesh as a carrier, and placing the carrier in a high-concentration alkaline solution; the stainless steel surface is subjected to oxidation treatment by applying long-time oxidation voltage to form an amorphous nickel-iron mixed oxide layer, the stainless steel with the oxidation layer formed on the surface is further soaked in a solution containing metal M salt, and nanoclusters loaded with the M salt of the stainless steel oxidation layer are formed through pulse electrodeposition; and the loading capacity and the cluster size of the nanocluster are regulated and controlled by changing the deposition current and the pulse frequency of pulse electrodeposition. Compared with the prior art, excellent seawater electrolysis anode catalysis corrosion resistance is achieved through commercial stainless steel surface modification treatment and precious metal nanocluster loading, and the stainless steel material subjected to modification treatment achieves long-term stable operation under the real seawater electrolysis industrial current density working condition.

The invention discloses a dust-free environment purification method for biological pharmacy. Comprising the following steps: constructing three layers of metal filter screens, realizing particle interception through a conical micro-column array, an Al2O3 / TiO2 composite ceramic layer and a diamond-like carbon film, fixing lysozyme by adopting a crystal face regulated ZIF-8 crystal, and realizing dual inactivation of microorganisms by combining dielectric barrier discharge of a spiral plasma channel. The electrostatic adsorption HEPA filter paper adopts a BaTiO3-graphene quantum dot composite electret substrate, and a TiO2 / graphene heterojunction catalytic layer is decomposed by a Pt-Co bimetallic nanocluster and a photocatalysis-plasma-ozone-thermocatalysis quadruple oxidation system; and 0.1 mu m organic aerosol triggers graded reverse pulse cleaning based on differential pressure integration and a particle concentration threshold value, and the honeycomb flow guide structure drives a shutter and a gradient density sintering metal flow guide plate through piezoelectric ceramics to maintain laminar flow uniformity. According to the scheme, the limitation of a traditional technology is broken through, the purification efficiency of 0.1 micron particles is improved, and a high-stability solution is provided for a biopharmaceutical clean room.

The invention belongs to the technical field of biological medicine, and particularly relates to a copper sulfide-gold nano-cluster composite liposome and a preparation method and application thereof, and the copper sulfide-gold nano-cluster composite liposome is composed of copper sulfide nanoparticles, gold nano-clusters and liposome; the preparation method comprises the following steps: loading a gold nano-cluster on the surface of a copper sulfide nano-particle, and then coating the copper sulfide nano-particle with a 1, 2-distearoyl-sn-glycerol-3-phosphorylethanolamine-L-lysine-2, 3-dimethyl maleic anhydride liposome with pH response, so as to obtain the copper sulfide-gold nano-cluster composite liposome. According to the copper sulfide-gold nano-cluster composite liposome prepared based on the method, a biofilm matrix of MRSA can be disintegrated through a photothermal effect, permeation of nanoparticles and ROS is enhanced, and the problem that traditional antibiotics are ineffective to biofilms is solved.

The present invention discloses a ratiometric fluorescent smart label for visually detecting the freshness of meat, and its preparation method and application. The smart label preparation method is specifically as follows: first, a ratiometric fluorescent indicator of gold-copper bimetallic nanoclusters (indicator) with red fluorescence and dual-ligand gold nanoclusters (internal standard) with green fluorescence is prepared; then, by a solution doping method, the ratiometric fluorescent indicator is added to a polyvinyl alcohol / polyethylene glycol solution to prepare a ratiometric fluorescent smart label; finally, a fluorescent colorimetric card is made based on the ratiometric fluorescent smart label, and the smart label is applied to the prediction of meat freshness grade and total volatile basic nitrogen content in combination with a smart phone. The ratiometric fluorescent smart label prepared by the present invention has higher accuracy and sensitivity than a colorimetric sensing indicator film; and the smart label is safe, biocompatible, biodegradable, and has strong mechanical properties, and has the function of real-time monitoring of the freshness of fresh meat and aquatic products.

The invention provides an alkaline electrolytic water hydrogen evolution reaction nickel-based electrode and a preparation method and application thereof, and belongs to the technical field of catalyst materials. The alkaline electrolytic water hydrogen evolution reaction nickel-based electrode has a monatomic-nanocluster-nanoparticle-support multilevel structure, the multilevel structure takes a metal nickel net as a support, nickel is loaded on the metal nickel net in the form of particles, molybdenum oxide is dispersed on the nickel particles in the form of clusters, and the metal nickel net is supported on the support. The preparation method comprises the following steps: preparing molybdenum oxide clusters, anchoring platinum on the molybdenum oxide clusters in the form of single atoms, loading nickel particles on a metal nickel net by utilizing a plasma spraying method, generating the molybdenum oxide clusters on the nickel particles through thermal annealing treatment, and then loading platinum single atoms on the molybdenum oxide clusters by utilizing an electrodeposition method, therefore, the nickel-based electrode for the hydrogen evolution reaction of the alkaline electrolyzed water is obtained. According to the invention, the hydrogen evolution reaction electrode with a multi-stage structure is prepared from a microreaction mechanism for the first time, the preparation cost is low, industrial production can be realized, and the hydrogen evolution reaction electrode can be applied to industrial hydrogen production.

The invention relates to the technical field of nano biosensing, in particular to a cerium-based metal organic framework loaded gold nano-cluster composite material as well as a preparation method and application thereof. A fluorescent and colorimetric dual-channel sensing platform is formed by compounding AuNCs and Ce-MOF and is used for detecting alpha-glucosidase and screening an alpha-glucosidase inhibitor, the cerium-based metal organic framework loaded gold nano-cluster composite material catalyzes and oxidizes a colorless substrate ABTS to generate colored oxABTS, and the oxABTS has characteristic ultraviolet absorption at 410 nm, so that the detection of alpha-glucosidase and screening of an alpha-glucosidase inhibitor can be realized. And the fluorescence of the cerium-based metal organic framework loaded gold nano-cluster composite material can be efficiently quenched through an inner filtering effect. Alpha-glucosidase catalyzes hydrolysis of a substrate AAG to generate AA, the AA can inhibit oxidation of ABTS regulated and controlled by a cerium-based metal organic framework loaded gold nano-cluster composite material, and then reduction of oxABTS ultraviolet absorption and fluorescence recovery of ACM are caused, so that dual-channel detection of alpha-GLU is realized through dual-signal output of colorimetric and fluorescence signals.

This invention relates to biodetection technology, disclosing a peptide-modified gold nanocluster, its preparation method, and its application in the detection of microplastics. The peptide-modified gold nanocluster comprises a gold nanocluster and a peptide LCI modified on the surface of the gold nanocluster, wherein the peptide LCI comprises an amino acid sequence as shown in SEQ ID NO: 1. The preparation method includes the following steps: providing functionalized modified gold nanoclusters; reacting the functionalized gold nanoclusters with the peptide LCI to attach the peptide LCI to the surface of the gold nanoclusters, forming the peptide-modified gold nanocluster. The microplastic detection method includes mixing the peptide-modified gold nanocluster with a test sample that may contain microplastics to obtain a detection solution, and performing colorimetric analysis or absorbance analysis on the detection solution. This gold nanocluster can specifically recognize polypropylene, exhibiting good specificity, low cost, and rapid detection of polypropylene microplastics.

The invention belongs to the technical field of biological medicine, and particularly relates to a chitosan modified gold nanocluster, a preparation method and application in red blood cell immobilization. According to the synthesis method of the CS-GSH-AuNCs cluster, a two-step low-temperature modification method is utilized, GSH-AuNCs core nanoparticles with a definite structure are synthesized firstly, then chitosan is modified through electrostatic interaction, the reaction condition is low temperature and nitrogen protection, the reaction condition is mild, the product repeatability is high, and the original structure of GSH-AuNCs is more complete. Experiments show that the CS-GSH-AuNCs cluster synthesized by the method has good acid and alkali tolerance and temperature tolerance, the effect of immobilizing red blood cells is good, and the biological safety is high.

The invention discloses a fluorescent array sensing system based on bionic taste sense, a construction method of the fluorescent array sensing system and application of the fluorescent array sensing system in food safety intelligent detection. According to the system, a functionalized ultrathin Ti3C2 MXene nanosheet serves as a bionic tongue carrier, multicolor silver nanoclusters synthesized by oligonucleotide chains are adsorbed on the surface of the functionalized ultrathin Ti3C2 MXene nanosheet to serve as bionic taste bud cells, different DNA chains can form different fluorescence emissions, the characteristic that fluorescence can be designed is achieved, and the preparation process of signal molecules can be greatly simplified. When a plurality of hazardous substances are added into the sensing array at the same time, the Ti3C2 MXene with strong binding capacity can preferentially capture a target object, and the silver nanoclusters with weak binding capacity can release or adsorb, so that fluorescence signals with different colors are changed, and a characteristic fingerprint spectrum is formed. And in combination with a machine learning algorithm, rapid, accurate, qualitative and quantitative intelligent identification of multiple food hazardous substances can be realized at the same time, and a new strategy is provided for simultaneous detection of multiple hazardous substances in food safety.

The invention relates to the technical field of mycotoxin rapid detection, in particular to an electrochemical luminescence sensor for citrinin detection and a detection method of the citrinin. A sensing substrate of the sensor is prepared by loading platinum nanoclusters (Pt NCs) on a NiCo-LDH / MXene composite substrate through an in-situ growth strategy; the high conductivity of MXene and the LDH confinement effect are utilized to synergistically promote three-dimensional exposure of Pt active sites, the efficiency of generating active oxygen through electro-catalysis is remarkably enhanced, and a light-emitting signal is improved. And a CRISPR / Cas12a system is further integrated, so that a regulation mechanism of recognition-cutting-signal de-suppression is realized, and food matrix interference is effectively avoided. And a new technology is provided for monitoring the fungaltoxin by combining a dual enhancement mechanism of material catalytic optimization and enzymatic signal amplification.

The invention provides a green synthesis method and application of gold nanoclusters based on silk fibroin, and belongs to the technical field of metal nanoparticle treatment. Mixing the silk fibroin solution with a glutathione aqueous solution to obtain a GSH / SF mixed solution; and a HAuCl4 aqueous solution is added, so that the gold nanocluster is prepared by a one-pot method. The prepared gold nanocluster is excellent in performance in cell marking and zebra fish living body imaging, and the excellent characteristic shows that the SF-AuNCs has a wide prospect in biomedical imaging. Not only is the application potential of the silk fibroin in the field of biomedical imaging expanded, but also a high-performance protein fluorescent nanoprobe is provided for bioimaging.

The invention belongs to the field of functional nano materials and optical imaging, and particularly relates to a gold nanocluster and a preparation method and application thereof. The surface of the gold nanocluster contains a sulfydryl ligand A and a sulfydryl ligand B, the sulfydryl ligand A is ATT, and the sulfydryl ligand B is a sulfydryl ligand containing arginine; fluorescence quantum efficiency and electron transfer efficiency are synergistically enhanced on the basis of interaction of hydrogen bonds in the gold nanoclusters, the ultra-small luminous gold nanoclusters protected by double ligands are synthesized, the electrochemical luminescence quantum efficiency of the ultra-small luminous gold nanoclusters is up to 13.0% and is 4.2 times of that of a standard compound terpyridyl ruthenium in the field of electrochemical luminescence, and the ultra-small luminous gold nanoclusters are high in electrochemical luminescence quantum efficiency. An electrochemical luminescence transition area can be narrowed by 10 times compared with a terpyridyl ruthenium imaging system, and zero-thickness ECL luminescent layer cell high-resolution imaging can be realized; good application prospects are realized in the fields of fluorescence detection, electrochemical luminescence detection, fluorescence imaging, electrochemical luminescence imaging and the like.

The invention belongs to the technical field of analysis and detection, and particularly relates to a fluorescent-Raman bimodal probe for hydrogen sulfide detection and a preparation method and application of the fluorescent-Raman bimodal probe for hydrogen sulfide detection. Specifically, 4-nitrobenzenethiol (4-NTP) modified silver nanocluster-gold nanoparticles are encapsulated in ZIF-8 to form the silver nanocluster / gold nanoparticle composite material. Compared with the prior art, the SERS probe material for hydrogen sulfide detection overcomes the defects that in the prior art, an SERS probe material for hydrogen sulfide detection is prone to interference and insufficient in reliability and sensitivity. According to the scheme, hydrogen sulfide is effectively enriched through introduction of the ZIF-8 metal organic framework, a detection signal is remarkably enhanced, the material can specifically recognize hydrogen sulfide, the response speed is high, the detection sensitivity is high, and the detection range is 10 <-13 >-10 <-3 > M.

The invention discloses a jet printing visual food freshness label and a manufacturing method and application thereof. The manufacturing method of the visual food freshness label comprises the following steps: firstly, preparing the metal nanocluster; the obtained metal nanocluster dispersion system is compounded with polyvinylpyrrolidone, and the ink is formed through ultrasonic dispersion and heat treatment; mixing a solvent with polyvinylpyrrolidone to obtain a regulating agent; the ink and the regulating agent are injected into independent ink boxes of an ink-jet printer respectively, patterns are deposited on a low-fluorescence background substrate through preset printing parameters, and the patterns are sealed and stored after being dried. Compared with other intelligent indication labels, the fluorescent intelligent label prepared by the invention has the remarkable advantages of low cost, high stability, uniform luminescence and capability of realizing large-scale and rapid preparation; and in the preparation process of the label, the use amount of the metal nanocluster solution can be greatly reduced, so that a more environment-friendly and green production mode is realized.

The invention relates to the technical field of lithium battery negative electrode materials, and particularly discloses a composite graphite negative electrode material and a preparation method and application thereof.The composite graphite negative electrode material comprises an inner core and a coating layer coating the outer side of the inner core, the inner core is graphite, and the coating layer is graphite. And the coating layer is a carbon layer doped with metal M atoms and oxide nano-clusters / particles of the metal M atoms. The coating layer doped with the metal M atoms and the oxide nano-clusters / particles of the metal M atoms can effectively reduce the diffusion barrier of Li < + >, and the lithium intercalation potential (greater than 0.3) of MOx is higher than that (0.02-0.2 V) of graphite, so that the probability of precipitation of Li < + > on the surface of the graphite due to polarization is reduced, and the risk of lithium precipitation is reduced.

The application discloses a preparation method and application of a zirconium dioxide loaded iridium oxide nanocluster oxygen evolution electrocatalyst. A mixed solution of zirconium salt, amide solvent and organic acid is prepared, and the mixed solution is kept at 120 DEG C for 24 hours; after cooling, the white product is separated, washed and dried. Then, the product and iridium salt are dispersed in a mixed solution of tetrahydrofuran and water, and sodium nitrate and potassium nitrate aqueous solution are added under stirring; after stirring, rotary evaporation is carried out at 60 DEG C, and the greenish powder obtained after drying is vacuum dried at 60 DEG C for 12 hours; the greenish powder is kept in a muffle furnace at 450 DEG C for 30 minutes, and then cooled in air; the greenish powder is washed with deionized water and anhydrous ethanol for multiple times, and finally vacuum dried at 60 DEG C for 12 hours. The zirconium dioxide loaded iridium oxide material based on oxygen overflow stable tetragonal zirconia can be specially applied to an electrocatalyst for an oxygen evolution reaction in an acidic electrolyte, has excellent oxygen evolution reaction activity, follows a lattice oxygen mechanism in the reaction process, and can realize an oxygen overflow effect from tetragonal zirconia to iridium oxide nanoclusters to stabilize the catalyst.

The present invention discloses a method for detecting vitamin B1 using fluorescence sensing using single-stranded DNA gold nanoclusters. Using gold nanoclusters synthesized using single-stranded A30-ssDNA as a template as fluorescent probes, this method enables label-free, rapid, highly sensitive, and highly specific quantitative detection of vitamin B1 content in complex systems. Specifically, gold nanoclusters synthesized using single-stranded A30-ssDNA as a template serve as fluorescent probes, specifically detecting vitamin B1 content in a solution through changes in fluorescence intensity. This method is simple, rapid, and possesses a wide linear range, a low limit of detection, good sensitivity, and specificity, and has promising application prospects in food, pharmaceuticals, and other areas.