343 results about "Nanoclusters" patented technology

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 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 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 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 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 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 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.

The purpose of one aspect of the present invention is to provide fluorescent particles having excellent dispersibility. One aspect of the present invention relates to a fluorescent particle (100) having: a core particle (10A) with a first charge, the first charge being a positive charge or a negative charge; at least one polymer layer (12) and at least one fluorescent layer (11A, 11B) on the core particle, the polymer layer containing a polymer and carrying a second charge, the second charge being a positive charge or a negative charge; and a fluorescent layer containing metal nanoclusters (13) having fluorescent properties and carrying a third charge, the sign of which is opposite to that of the second charge.

This invention discloses a process for preparing ultrafine glass powder using a spray pyrolysis method in the field of glass encapsulation materials. The process first prepares a homogeneous solution A using boric acid, aluminum nitrate nonahydrate, alkaline earth metal nitrates, lithium acetate, sodium acetate, and potassium acetate. Tetraethyl orthosilicate is dissolved in anhydrous ethanol to obtain solution B. A rare earth transition metal composite oxide nanoclusters encapsulated with a silica shell hybrid inorganic modifier is dispersed in anhydrous ethanol to obtain suspension C. Solution B and suspension C are mixed, and deionized water and hydrochloric acid are added to adjust the pH. After pre-hydrolysis and cooling, triethyl borate is added dropwise for co-condensation, and then mixed with solution A. After adjusting the pH and aging, the mixture is ultrasonically atomized and spray pyrolyzed to obtain ultrafine glass powder. The glass powder obtained by this invention has small particle size, high sphericity, and can be continuously produced.

The invention relates to a gold nanocluster with controllable luminescence color and a preparation method and application thereof. The gold nanocluster is formed by combined action of TSA, chloroauric acid and zinc ions. The gold nanocluster prepared by the invention can show different luminous colors after being heated at room temperature and high temperature, and can be used for information encryption; meanwhile, due to the high-temperature-resistant characteristic, the material can also be used as a thermal trigger mark. The preparation method of the gold nanocluster is simple and low in cost; the detection means is simple and rapid and easy to observe; and repeated use can be realized.

The present invention discloses a preparation method and application of a composite probe for gold nanoclusters emitting enhanced fluorescence induced by the spatial confinement effect of ZIF-8 surface. HAuCl4 and glutathione are dissolved in water, the two solutions are mixed and reacted, and purified to obtain an AuNCs solution; Zn(NO3)2·6H2O and 2-methylimidazole are dissolved in methanol, the two solutions are mixed and reacted, and the generated white precipitate is treated to obtain a zeolite imidazole framework-8 solution; the obtained AuNCs solution and the zeolite imidazole framework-8 solution are mixed, stirred, self-assembled, and treated to obtain ZIF-8@(Au) nanoparticles; zinc nitrate and dimethylimidazole are added to the nanoparticle solution for reaction, and after treatment, a sandwich ZIF-8@Au@ZIF-8 nanomaterial is obtained; the nanomaterial is mixed and treated with the AuNCs solution to obtain a ZIF-8@Au loaded with two layers of AuNCs; the operation is repeated to obtain a ZIF-8@(Au@ZIF-8) loaded with n layers of AuNCs. n The present invention significantly improves the effective utilization rate of assembly space and fluorescence performance, and realizes ultra-sensitive detection of fluorescence immunoassay.

The invention discloses a gas-phase white carbon black tail gas dechlorination process, which belongs to the technical field of tail gas treatment, and comprises tail gas pretreatment and particulate matter separation, germanium molecular sieve carrier preparation and modification, Fe-Cu bimetallic nano-cluster loading, dynamic pulsed electric field activation, dry-process dechlorination, wet-process reduction synergistic dechlorination and photo-thermal coupling regeneration. According to the method, the alkyl halide dehalogenase is introduced as a stabilizer, and the Fe3O4-CuO nano-cluster activated by the dynamic pulsed electric field is adopted, so that the reaction process is remarkably optimized, the alkyl halide dehalogenase and active components in the sodium thiosulfate solution form synergistic action sites, the selectivity and efficiency of sodium thiosulfate participating in the reaction are improved, and the reaction time is shortened. The consumption in a non-target reaction is avoided; according to the Fe3O4-CuO nano-cluster activated by the dynamic pulsed electric field, the chlorine removal efficiency is improved, and the usage amount of sodium thiosulfate is reduced, so that the consumption amount of sodium thiosulfate and the generation amount of waste liquid are synchronously reduced, and the high-cost investment of enterprises on waste liquid treatment and the risk of environmental protection compliance are reduced.

This invention relates to the field of electrochemical energy storage technology, providing an integrated solid-state battery module based on SiO2 aerogel powder and its preparation method. This battery module incorporates Janus-structured SiO2 aerogel powder with dual stress-thermal response capabilities to construct a synergistic interface system of stress buffering, ion conduction, and thermally triggered self-healing. The Janus powder forms a rigid core with ZrO2 nanoclusters and a SiO2 network, with a dynamic shell containing Diels-Alder dynamic covalent bonds grafted onto its outer surface and pore inner walls. A lithium salt-ionic liquid composite is loaded into the pores. A vertical columnar stress-supporting framework is formed through a transient liquid-phase assisted cold sintering process. Combined with a two-step thermally triggered self-healing treatment, stress buffering of electrode volume changes during charging and discharging, and interface self-healing in the early stages of thermal abuse are achieved. This invention significantly improves the interface stability, cycle life, and thermal safety of solid-state batteries, making it suitable for applications such as power batteries and high-capacity energy storage batteries.

The application provides a water-soluble gold nanocluster with a crystallographic structure and a preparation method thereof. The water-soluble Au 25 nanocluster with a single crystal structure is synthesized by using 2-mercaptonicotinic acid, 6-mercaptonicotinic acid or 6-mercaptobenzoic acid as a protective ligand, and the single crystal structure of the water-soluble Au 25 nanocluster is determined. The method in the application is simple, the reaction condition is easy to realize, and the gold nanocluster with a single crystal structure is obtained, and the accurate single crystal structure of the gold nanocluster is obtained, which is very important for analyzing the correlation between fluorescence and structure. The gold nanocluster Au 15 (2-Hmna) obtained by the application has near-infrared luminescence, the near-infrared has a deeper penetration into biological tissues, and has great application potential in the biomedical field.

An analyzer is disclosed for detecting and quantifying a glutaraldehyde (GLUT) composition in a water sample. The analyzer includes a peristaltic pump and a three-way valve, where the pump draws in a water sample comprising a GLUT composition through the 3-way valve. The analyzer also includes a 6-way valve that receives the water sample and a bovine serum albumin-coated gold (Au-BSA) nanoclusters reagent. The analyzer also includes: a debubbler that receive a mixture of the water sample and the reagent and removes bubbles from the mixture; and a reaction coil that receives the water sample and the reagent from the debubbler, such that they are reacted. The analyzer further includes a fluorescence flow cell that receives the reacted mixture; measures a fluorescence intensity of the Au-BSA nanoclusters in the mixture; and determines a concentration of the GLUT composition in the water sample based on the fluorescence intensity.

The application discloses a fluorescent / colorimetric dual-mode sensor for hydrogen sulfide detection and a preparation method thereof. The method comprises the following steps: synthesizing gold nanoclusters and metal-organic framework materials in situ to obtain a gold nanocluster / metal-organic framework composite material, uniformly mixing the composite material and sodium alginate to obtain a casting solution, and then dropping the casting solution on a substrate to perform scraping, molding and cleaning to obtain a gold nanocluster / metal-organic framework hydrogel membrane sensor. The sensor not only has a significant improvement in the fluorescence performance, but also can respond to hydrogen sulfide in the fluorescence and colorimetric channels respectively, and has the advantages of high sensitivity and high selectivity.

The invention discloses construction and application of a biosensor for triggering controlled release based on adjacent induced DNA strand displacement, and belongs to the technical fields of electrochemical luminescence, biological analysis and nano science. According to the invention, by integrating adjacent induced DNA strand displacement and controlled release strategies, the ultra-sensitive self-closing dual-mode biosensor taking the Au-Ag nanocluster as a luminous body is developed, and the ultra-sensitive self-closing dual-mode biosensor is used for trace detection of neuron-specific enolase. Due to the synergistic characteristic between the double metals, the Au-Ag nanocluster has high electrochemical luminescence (ECL) efficiency. Meanwhile, the reduction of S2O8 < 2-> is catalyzed by cyclic conversion between Fe < 2 + > / Mn < 3 + > and Fe < 3 + > / Mn < 4 + >, and a large amount of SO4 <-> is generated for ECL emission. The specific binding between the target antigen and the antibody can drive DNA strand displacement to open a blocked hole, so that the electrochemical probe falls off and the probe is quenched to release, the self-closing of an electrochemical signal and an ECL signal is realized, the detection sensitivity and accuracy of the sensor are effectively improved, and the sensor is suitable for immunoassay of various biomarkers.

The invention provides a preparation method and application of a fluorescence sensor for detecting metal ions based on a metal organic framework packaged nano-cluster. The preparation method comprises the following steps: by taking flexible fibers as a base material, firstly coating the surface of the flexible fibers with a metal organic framework, and then soaking the flexible fibers coated with the metal organic framework in a polyethyleneimine-terminated nano-cluster solution, thereby obtaining the metal ion detection fluorescent sensor based on the nano-cluster packaged by the metal organic framework. The polyethyleneimine is utilized to improve the stability and the fluorescence property of the nano-cluster obtained by reduction, so that the fluorescence sensor can maintain the fluorescence property under different pH values and temperature conditions. The prepared fluorescence sensor can rapidly respond to existence of target ions, fluorescence signals change obviously and rapidly, toxicity is small, reproducibility is good, the lower detection limit is low, fluorescence quenching is conducted on metal ions, and sensitivity is high.

The invention provides a nitrogen-doped upright graphene heterojunction, a preparation method, application, a signal coding device, an image generation device and an image generation method. The preparation method comprises the following steps: placing an SOI substrate in a growth chamber; vacuumizing the growth chamber; heating the SOI substrate; introducing methane and ammonia gas into the growth chamber, and growing nitrogen-doped upright graphene on the surface of the SOI substrate by a PECVD (Plasma Enhanced Chemical Vapor Deposition) process; and spin-coating a gold nanocluster solution on the surface of the nitrogen-doped upright graphene, so that gold nanoclusters are attached to the interior of the nitrogen-doped upright graphene.

The application belongs to the field of optical functional composite material application, and discloses a preparation method of conjugated oligomer / gold nanocluster light energy conversion material. The preparation method is to synthesize conjugated oligomer material with main chain of fluorene and thiophene and side chain containing active groups, and to compound the conjugated oligomer material with gold nanocluster containing mercapto ligand through covalent connection to prepare conjugated oligomer / gold nanocluster compound. The preparation method is simple and easy to operate, and can effectively compound two kinds of semiconductor materials. The nanocomposite has a size of about 2 nanometers and has the ability to quickly enter photosynthetic organisms and structures. The conjugated oligomer / gold nanocluster heterojunction is cultured with photosynthetic organisms and structures, and under sunlight irradiation, high-efficiency photo-generated electrons are generated and quickly transferred to the electron transport chain of the photosynthetic organisms and structures, so as to improve the solar energy conversion efficiency, increase the biomass yield, and have practical application value in the field of energy conversion.

The invention discloses a supramolecular fluorescent probe as well as a preparation method and application thereof, and belongs to the technical field of nano material application. The supramolecular fluorescent probe is formed by compounding gold nanoclusters and a bovine serum albumin solution, and the concentration ratio of the gold nanoclusters to the bovine serum albumin solution is (1-2): (2-4). The invention further discloses a preparation method of the supramolecular fluorescent probe and application of the supramolecular fluorescent probe. A fluorescent sensing system of the supramolecular fluorescent probe based on the gold nanocluster material and the bovine serum albumin has excellent selectivity and sensitivity on cypermethrin pesticide, interference of other impurities can be effectively avoided, and response is fast.

The invention discloses application of gold nanoclusters in improvement of salt tolerance of cotton. According to the application, a solution containing the L-gold nanoclusters and / or the D-gold nanoclusters is applied to cotton roots or leaves. The concentration of the L-gold nanocluster in the solution is 0.001 to 0.01 mM; or in the solution, the concentration of the D-gold nanocluster is 0.003 to 0.008 mM. The gold nanocluster can well improve the fresh weight of the cotton under salt stress, can improve the chlorophyll content and photosynthesis of the cotton under salt stress, and can improve the oxidation resistance of the cotton under salt stress.