55results about How to "Evenly groomed" patented technology

The invention relates to a making method and an application of a mycotoxin photoelectrochemical sensor for in situ generation of CdS. The method uses cerium dioxide doped reduced graphene oxide as an antibody capture substrate, and the cerium dioxide doped reduced graphene oxide has good conductivity and large specific surface area, and can effectively reduce background signals. Na2S is directly dropped to the surface of an electrode with Cd<2+> functionalized porous TiO2 nanoparticles as a semiantigen marker carrier in order to realize in situ generation of narrow band gap CdS with a high photoelectric conversion rate, and a photoelectric current signal can be generated through irridating the CdS by an LED lamp of visible light wavelength. The carrier TiO2 can be well matched with the energy band of the CdS in order to further improve the photoelectric conversion signal of the CdS, so the competitive photoelectrochemical sensor for super sensitive detection of zearalenone, alpha-zeranol, aflatoxin B1, aflatoxin B2, ochratoxin A, ochratoxin B and other mycotoxins is made.

The invention relates to a preparation method of a photoelectrochemical sensor for detecting dexamethasone based on in-situ generation of cadmium sulfide. The method specifically comprises the following steps: as carboxylated carbon nitride and bismuth sulfide are taken as substrate materials, and labeling a dexamethasone antibody by using titanium dioxide subjected to cadmium ion functionalization. Sodium sulfide is directly dropwise added to the electrode surface, a narrow band-gap cadmium sulfide semiconductor nanometer material with the high photoelectric conversion efficiency is generated in situ, and a photocurrent signal is generated under light source irradiation with visible wavelength. A porous titanium dioxide carrier and a cadmium sulfide energy band are well matched, so that the photoelectric conversion efficiency of the cadmium sulfide is improved, the high-sensitivity detection of dexamethasone is realized, and the detection limit is 2pg / mL.

The invention discloses a preparation method of silver / graphene composite films and an application of the preparation method in ultraviolet detectors and belongs to the technical field of functional materials. The graphene / silver nanoparticle composite films are prepared through two-step in-site reduction on graphene oxide and silver salt through hydrazine hydrate and sodium citrate, silver ion takes a graphene sheet as nuclear crystallization as compared with a single-step reduction method and is more evenly modified on the graphene, and the problem about agglomeration of silever nanoparticles is effectively improved. A graphene / silver nanoparticle composite solution is prepared through two-step in-situ reduction on the graphene oxide and silver nitrate through the hydrazine hydrate and the sodium citrate and is coated on a silicon substrate to be dried to form the films, and finally a sputtering gold electrode serves as a top electrode to complete the ultraviolet detectors; the ultraviolet detectors based on the graphene / silver nanoparticle composite films are high in light current and short in response and recovery time.

The invention discloses a preparation method of a modified high-nickel ternary positive electrode material, which comprises the steps of uniformly mixing a nickel-cobalt-manganese hydroxide precursor with a lithium source and a magnesium source, and carrying out two-stage sintering to obtain a magnesium-doped ternary high-nickel positive electrode material; and dispersing the magnesium-doped ternary high-nickel positive electrode material in an organic solvent, then adding a vanadium source and a lithium source, uniformly stirring, heating, evaporating to dryness, drying, and sintering at high temperature to obtain the lithium vanadate-coated magnesium-doped high-nickel ternary positive electrode material. According to the modified high-nickel ternary positive electrode material disclosed by the invention, the cycle performance and the rate capability of the material can be synergistically improved due to the high-nickel ternary positive electrode material is subjected to double modification treatment of magnesium ion doping and fast ion conductor coating.

The invention belongs to the technical field of nano hybrid materials, and particularly relates to a graphene oxide / AgInS2 nano hybrid material and a preparation method thereof. AgInS2 nano particles are modified on the surface of the graphene oxide. The preparation method of the graphene oxide / AgInS2 nano hybrid material includes the steps of evenly dispersing graphene oxide in oleic acid, adding octadecene and oleylamine respectively, and mixing; adding the mixed liquor of graphene oxide slowly into the mixed liquor of oleic acid containing In (DEDC) 3 and Ag (DEDC); and moving to a reaction kettle for reaction after stirring, adding absolute ethyl alcohol for precipitation after cooling, centrifugally washing the precipitate and drying. The graphene oxide / AgInS2 nano hybrid material is good in stability, low in LOD (limit of detection) of NO2<-> and capable of being used in detection of food such as sausage, pot-stewed products and the like; and the preparation method has the characteristics of facilitation of operation, wide raw material source, low production cost, non-toxic and the like, and is suitable for industrial production.

The invention relates to the technical field of gas detection, in particular to a label color band for detecting hydrogen and a preparation method thereof. The preparation method comprises the following steps: a noble metal quantum dot is modified on the surface of a hydrogen sensitive material substrate by an ultraviolet reduction method to obtain the label color band for detecting hydrogen. In the label color band for detecting hydrogen, after the hydrogen-sensitive material is reacted with the hydrogen, the change of the optical signals such as the emissivity, the transmittance, the wavelength and the like is caused, so that the corresponding hydrogen concentration in the environment is detected, the noble metal quantum dots are modified on the surface of the hydrogen-sensitive materialby adopting the ultraviolet reduction method, the sensitivity of the label color band to the hydrogen is improved while the specific surface area of the sensitive layer is increased, and the hydrogencan be adsorbed more quickly and the response can be carried out.

The invention relates to a preparation method of nano-magnetic beads modified by gold nanoparticles. The preparation method comprises the following steps: (1) dispersing ferroferric oxide nano-magnetic beads in a sugar solution, and carrying out a hydrothermal reaction at 160-220 DEG C so as to obtain nano-magnetic beads modified through glycosylation, wherein a monosaccharide solution or an oligosaccharide solution serves as the sugar solution; and (2) dispersing the nano-magnetic beads modified through glycosylation in a trisodium citrate solution, and then adding a chloroauric acid solutionfor a reduction reaction, so as to obtain the nano-magnetic beads modified by the gold nanoparticles. The preparation process is simple; the surfaces of the obtained nano-magnetic beads are uniformlymodified; and meanwhile, the stability and the application performance of such composite magnetic beads are improved.

The invention relates to a silicon dioxide loaded chitosan modified waterborne polyurethane acrylate composite emulsion, a preparation method therefor and an application of the composite emulsion. Themethod comprises the steps: (1) dispersing macroporous sillca nanoparticles in deionized water through ultrasonic dispersion, adding a chitosan solution, and carrying out uniform mixing; (2) carryingout filtering so as to obtain a filter cake, removing impurities from the filter cake, and then, carrying out drying, so as to obtain macroporous sillca loaded chitosan nanoparticles; and (3) dispersing the particles in deionized water through ultrasonic dispersion, adding the dispersion into a waterborne polyurethane acrylate emulsion, and carrying out uniform mixing, thereby obtaining the composite emulsion. According to the composite emulsion, chitosan can be released continuously to achieve a long-acting antibacterial effect, and the permeability to water vapor and antibacterial propertyof a film formed by waterborne polyurethane acrylate are improved; and when the composite emulsion serves as a leather finishing agent, the tensile strength, tear strength and permeability to water vapor of a leather sample can be increased by 6.25%, 6.67% and 197.42% separately, and an inhibition zone can reach 30mm.

The invention belongs to the technical field of molecular biology and in particular relates to an SERS probe and an SERS substrate labeled by multiple antibodies as well as a preparation method and application of the SERS probe and the SERS substrate. Dopamine is embedded and combined with multiple antibodies under auto-polymerization conditions so as to obtain the SERS substrate and the SERS labeled probe modified by the polydopamine and the antibodies. By virtue of immune binding force, high-sensitivity detection and diagnosis of exosome extracted from pancreatic cancer cells and serum samples of clinical pancreatic cancer patients can be realized by utilizing Raman spectroscopy. Statistical data analysis discovers that an SERS platform based on an MIF antibody is capable of realizing phased tumor judgment of the pancreatic cancer. The SERS probe disclosed by the invention is simple and convenient in labeling method, is used for detection of exosome of the pancreatic cancer, is rapid, sensitive, high in specificity and small in amount of needed samples, does not need a high-speed centrifugal separation process and can be applicable to clinical diagnosis and phased tumor metastasis judgment.

The invention discloses a storage device based on a graphene quantum dot / polyaniline / gold nanoparticle / polyvinyl alcohol composite material and a preparation method thereof. The storage device comprises a lower electrode, an electroactive intermediate layer and an upper electrode, wherein the electroactive intermediate layer is a graphene quantum dot / polyaniline / gold nanoparticle / polyvinyl alcoholcomposite material, and the thickness is 100-150nm. According to the invention, firstly the surfaces of polyaniline coated graphene quantum dots are modified by gold nanoparticles, then a graphene quantum dot / polyaniline / gold nanoparticle composite material is dispersed in polyvinyl alcohol, and the graphene quantum dot / polyaniline / gold nanoparticle / polyvinyl alcohol composite material is obtained by spin coating. In the composite material, polyaniline effectively reduces the aggregation of the graphene quantum dots and gold nanoparticles, the graphene quantum dots and the gold nanoparticlesimprove the carrier transport ability, and polyaniline interacts with a hydrogen bond of polyvinyl alcohol to ensure the uniform dispersion of other components in polyvinyl alcohol, thereby enabling the device to have good storage performance.

The invention provides a synthesis method of PEDOT loaded grapheme. The synthesis method of PEDOT loaded graphene is characterized in that the synthesis method of the PEDOT loaded grapheme comprises the following steps that EDOT monomer is dissolved in isopropanol, graphite oxide is added, ultrasonically stirring and dispersing are carried out to form sol; ferric trichloride is dissolved in a deionized water solution, the mixture is slowly added into first sol, and continuously stirring is carried out during the adding process to obtain mixed mother liquor; a potassium iodide solution is added, continuously stirring and reacting at room temperature for 8-24 hours are carried out to obtain precipitate, the precipitate is washed and dried to obtain PEDOT loaded graphene powder. All the raw materials are common cheap chemicals, are synthesized by adopting a green process, PEDOT obtained by in-situ polymerization in the graphite oxide sol is uniformly modified on graphene oxide, then KI isused for reducing graphite oxide, and a product I2 is absorbed by PEDOT, so that uniform modification of the PEDOT on the surface of reduced highly conductive graphene is achieved, and the effect ofsynergistically increasing conductivity is achieved.

The invention discloses a treatment method of a natural graphite material, a natural graphite material treated by the method and application of the natural graphite material. The treatment method of the natural graphite material comprises the following steps: (1) drying the natural graphite material until the mass percent of moisture is less than or equal to 1%, and then grinding at a rotating speed of 20000-25000r / min for 5-10 minutes; (2) mixing the material obtained in the step (1) for 90-150 minutes, and then sieving. The treatment method is capable of obviously reducing the specific surface area of the natural graphite material without affecting the original particle size distribution of the material, and as a result, the material morphological regularity of the material is increased, the development of the discharge capacity and the efficiency is not affected, the processability and the sieving performance are improved, the material is good in safety and stable in property, and almost no difference exists between batches.

Provided is a human interferon, wherein at least one amino acid residue is replaced with Lys-azido. Further provided is a pegylated human interferon, which improves in vivo stability of the human interferon. Additionally, provided is a method for preparing the interferon and a pegylated product thereof, which comprises using a plasmid which can express tRNAPyl / PylRS.

The invention relates to a railway station passenger dispersion advertisement machine and a passenger dispersion method. The passenger dispersion advertisement machine comprises a machine body; a first identity recognition module arranged on the machine body; an information acquisition module and a display module arranged on the machine body. The passenger dispersion method comprises the followingsteps: identifying the identity of a passenger; acquiring the riding information of the passenger according to the identity of the passenger; displaying the map in the station, and displaying the current position of the passenger according to the riding information of the passenger, and the guidance path of the passenger to the next place or the destination. The passenger can quickly go to the next place through the guidance path displayed by the passenger dispersion advertisement machine and the passenger dispersion method, therefore, the passengers can be smoothly and quickly dispersed, andthe passengers can accurately find the get-on places at one time, so that the entering efficiency of the passengers is improved, and the situation that the passengers cannot get on the vehicles is avoided.

The invention discloses a preparation method of a folic acid sulfhydrylation derivative. The preparation method comprises the following steps that -SH in thiol is protected to obtain a derivative of thiol, so that sulfydryl having high reaction activity is protected; then, in the presence of a catalyst and a dehydrating agent, esterification reaction is carried out between hydroxyl on the protected thiol derivative and folic acid, so that a modified folic acid derivative is obtained; a carbon sulphur bond in the folic acid derivative is broken through reduction reaction; sulfydryl is formed again in a product, and therefore, the target product, namely sulfhydrylation folic acid, is obtained. According to the preparation method disclosed by the invention, trityl chloride is replaced by triphenylcarbinol; the disadvantages of difficulty in separation of products and lower product yield are overcome; the product yield is increased; in the esterification reaction, a solid catalyst (macroporous cation exchange resin) is adopted, so that the separation efficiency of products is greatly improved; micromolecules, such as 4-dimethylamino-pyridine (DMAP), are adopted in normal biological preparation; the micromolecules are easily dissolved in a solvent and difficult to separate.

The present invention includes compositions and methods for treating T cell lymphomas and leukemias. In certain aspects, the compositions and methods include CAR T cells targeting CD2, CD5, or CD7 and modified cells, wherein CD2, CD5, or CD7 has been knocked-out.

The invention discloses a Ti3C2-MXene modified alpha-iron oxide photoelectrode and a preparation method thereof, and relates to the technical field of nano materials. The method comprises the following steps: dipping FTO conductive glass into a reaction kettle containing a mixed aqueous solution of ferric salt and Ti3C2-MXene, co-depositing iron oxide and Ti3C2-MXene on the surface of FTO conductive glass by using a hydrothermal method, and carrying out annealing treatment to obtain the Ti3C2-MXene modified alpha-iron oxide photoelectrode. According to the Ti3C2-MXene modification method, theproblems that traditional alpha-iron oxide is poor in conductivity, short in surface carrier life and the like are solved, the photoelectric conversion efficiency of the alpha-iron oxide is improved,and then the photoelectrocatalysis capacity of the alpha-iron oxide is improved.

Various TnMUC1-specific chimeric antigen receptors (CARs), nucleic acids encoding the same, and methods of using the same, are provided. Compositions and methods comprising a TnMUC1-specific CAR for treating MUC1-associated cancer in a subject in need thereof are provided.

The invention discloses a porous carbon modified glassy carbon electrode, which is prepared by the steps of pyrolyzing sodium alginate under the protection of nitrogen, cooling a carbon material obtained by pyrolysis to room temperature, adding the carbon material into hydrochloric acid with the concentration of 1-5mol / L, soaking and stirring for 20-60 minutes, washing with distilled water to be neutral, and drying to obtain porous carbon; dispersing porous carbon into N,N-dimethylformamide, and carrying out uniform ultrasonic dispersion to obtain a porous carbon dispersion liquid; and polishing a glassy carbon electrode with Al2O3 until the mirror surface is smooth, then sequentially carrying out ultrasonic cleaning with ethanol and secondary distilled water, washing with the secondary distilled water, blow-drying, dropwise adding the porous carbon dispersion liquid, and drying to obtain the porous carbon modified glassy carbon electrode. A three-electrode system composed of the porous carbon modified glassy carbon electrode can distinguish oxidation peaks of catechol, hydroquinone and resorcinol, significantly enhances electrochemical signals of three target objects, improves thedetection sensitivity, and can be used for determination of actual environmental water samples.

The invention discloses a Pt or Au modified porous PdFe intermetallic compound, and a preparation method and an application thereof, and belongs to the technical field of electrochemistry. An intermetallic compound is a nanoparticle; an inner core of the nanoparticle is an ordered PdFe intermetallic compound; the surface of the nanoparticle is of a porous structure with uniformly distributed Pd; and the surface of the porous structure is modified with Pt or Au. The preparation method comprises the steps of using palladium acetate and ferric salt as metal sources, and loading the metal sourceson a carbon carrier; then thermally decomposing acetate in a protective atmosphere to obtain a supported PdFe intermetallic compound; and after Fe on the surface is etched away, adopting a surface modification technology to prepare the Pt or Au modified PdFe intermetallic compound with the porous surface and the ordered inner core. The Pt or Au modified porous PdFe intermetallic compound preparedby the method shows relatively high activity and stability as a negative oxygen reduction reaction catalyst and a positive hydrogen oxidation reaction catalyst of a fuel cell.

The invention relates to the technical field of preparation of artificial bone repair materials in the field of inorganic nonmetallic materials and biomedical materials, in particular to a preparationmethod of a high-biological activity support material. The preparation method of the high-biological activity support material, provided by the invention, comprises the following steps: a titanium-based titanate nano-wire matrix is made of a titanium sheet, homemade solid graphene oxide is configured into turbid liquid, a graphene nano-sheet suspension is obtained by adding sodium hydroxide, chloroacetic acid and other substances through ultrasonic dispersion, and the titanium-based titanate nano-wire matrix is subjected to electrophoretic deposition with deposition liquid to obtain the high-biological activity scaffold material. Graphene oxide is deposited and modified on the surface of the matrix, so that the biocompatibility and the biological activity of the support material are improved; a coating solution used is a silk fibroin stock solution and casein, is high in degradation property and does not produce any toxic substance; and through the functionalization of the chloroacetic acid, 1,3-propylenediamine and the like for hydroxyl, amino and carboxyl of the graphene oxide, the bone induction ability of a unfunctionalized support material is further improved, and therefore,the application prospect is wide.

The invention relates to the technical field of medical biomaterial preparation, and in particular to a preparation method of a titanium-based bone repair material. The preparation method comprises the following steps: preparing a nanowire matrix from titanium sheets, preparing a graphene oxide solid from graphite powder and sodium nitrate, preparing a suspension from the graphene oxide solid, adding sodium hydroxide and chloroacetic acid to obtain a carboxylated graphene oxide colloid, doping tris (hydroxymethyl) aminomethane and 1,3-propylenediamine to obtain a graphene nanosheet suspension,and carrying out electrophoretic deposition on the nanowire matrix with the graphene nanosheet suspension and coating liquid as deposition liquid in sequence, so as to obtain the titanium-based bonerepair material. The nanowire matrix can deposit and modify graphene oxide on the surface, thereby improving the biocompatibility and bioactivity of the bone repair material; the titanium-based nanowire matrix is modified by electrophoretic deposition, so as to improve the mechanical strength of the material; calcium and phosphorus elements-containing in casein provide sufficient nutrients for theproliferation of bone cells in the early period; and thus the titanium-based bone repair material has broad application prospects.

The invention relates to a preparation method of a flexible composite material, a water-system nickel-iron battery electrode containing the flexible composite material, and a battery. The preparationmethod of the flexible composite material comprises the following steps of step 1, dissolving iron acetone and indium acetone into an organic solvent; step 2, dripping the mixed solution onto filter paper, drying in an oven at the temperature of 60 DEG C, and removing the organic solvent; step 3, calcining the obtained material in a tubular surface led with Ar (argon) gas, so as to obtain the flexible FeOx / InOx / CF composite material; step 4, calcining the obtained flexible FeOx / InOx / CF composite material in the tubular furnace led with H2S (hydrogen sulfide) gas, so as to obtain the flexible FeOx / InOx / CF composite material. The preparation method has the advantages that the technology is simple; the green and environment-friendly effects are realized; the passivating of electrode and the side effect of hydrogen separation are effectively inhibited, the higher mass specific capacity and coulomb efficiency are realized, and the practical application requirements can be met.

The invention discloses a preparation method of a folic acid sulfhydrylation derivative. The preparation method comprises the following steps that -SH in thiol is protected to obtain a derivative of thiol, so that sulfydryl having high reaction activity is protected; then, in the presence of a catalyst and a dehydrating agent, esterification reaction is carried out between hydroxyl on the protected thiol derivative and folic acid, so that a modified folic acid derivative is obtained; a carbon sulphur bond in the folic acid derivative is broken through reduction reaction; sulfydryl is formed again in a product, and therefore, the target product, namely sulfhydrylation folic acid, is obtained. According to the preparation method disclosed by the invention, trityl chloride is replaced by triphenylcarbinol; the disadvantages of difficulty in separation of products and lower product yield are overcome; the product yield is increased; in the esterification reaction, a solid catalyst (macroporous cation exchange resin) is adopted, so that the separation efficiency of products is greatly improved; micromolecules, such as 4-dimethylamino-pyridine (DMAP), are adopted in normal biological preparation; the micromolecules are easily dissolved in a solvent and difficult to separate.

The invention discloses a nano iron oxide modified carbon-based electrode as well as a macroscopic-size large-scale preparation method and application thereof, and belongs to the technical field of microbial electrochemistry. The macroscopic-size large-scale preparation method comprises the following steps: (1) weighing a carbon source and an iron source, and dissolving the carbon source and the iron source in deionized water to obtain an iron oxide precursor solution; and (2) taking a carbon-based electrode, sequentially cleaning the carbon-based electrode with acid and deionized water, naturally airing the carbon-based electrode, infiltrating the carbon-based electrode with an iron oxide precursor solution, drying the carbon-based electrode, wrapping and sealing the carbon-based electrode with aluminum-foil paper, and performing heat treatment on the carbon-based electrode in a muffle furnace to obtain the nano iron oxide modified carbon-based electrode. The iron oxide nano material is modified on the surface of the carbon-based electrode, the extracellular electron transfer efficiency of the electrode and microorganisms is improved, the preparation process is simple, iron oxide and the surface of the electrode are tightly combined under the action of a carbon source under the condition of high-temperature pyrolysis, the electrode with a stable structure is obtained, the electrochemical performance of microorganism electrochemistry is improved, and the application prospect is wide. Enrichment of functional microorganisms is promoted, and the removal effect of pollutants in a polluted water body is enhanced.

The invention discloses a Pt or Au modified porous PdFe intermetallic compound, a preparation method and an application thereof, and belongs to the technical field of electrochemistry. The intermetallic compound is a nano particle, the inner core of the nano particle is an ordered PdFe intermetallic compound, the surface is a porous structure with evenly distributed Pd, and the surface of the porous structure is decorated with Pt or Au. The preparation method is to use palladium acetate and iron salt as the metal source, and load it on the carbon carrier, and then thermally decompose the acetate in a protective atmosphere to obtain a supported PdFe intermetallic compound. After etching away the Fe on the surface, use Surface modification technology prepared Pt or Au modified PdFe intermetallic compounds with porous surface and ordered inner core. The Pt or Au modified porous PdFe intermetallic compound prepared by the invention shows high activity and stability as a fuel cell cathode oxygen reduction reaction catalyst and an anode hydrogen oxidation reaction catalyst.

In order to solve the problems of the existing manganese dioxide-modified porous carbon materials, such as complex preparation process, long cycle and unfriendly environment, the present invention provides an amorphous manganese dioxide-modified shrimp shell carbon matrix (δ-MnO 2 The preparation method of @BCF) is characterized in that it comprises the following steps: step 1: using EDTA aqueous solution to treat the shrimp shell powder; step 2: pyrolyzing the shrimp shell powder treated in step 1 in an inert atmosphere; step 3 : The pyrolysis product is treated with potassium permanganate dilute acid solution, and then the pyrolysis product after treatment with potassium permanganate dilute acid solution is dried to obtain the amorphous manganese dioxide modified biomass carbon matrix composite material. The present invention also provides the application of the amorphous manganese dioxide modified shrimp shell carbon base prepared by the above-mentioned preparation method.

The invention relates to a measurement device for a material wearing capacity and a wearing temperature field. According to the technical scheme, a motor (7) of a friction mechanism (1) is connected with an abrasive disk (11) through a shaft, a press beam (10) is hinged to a rotatable press beam base (9), and a sample (13) to be measured is installed in a sample fixing sleeve (12) of the press beam (10); a lubricant container (18) of a flow control mechanism (3) is connected with a supercharger (19), a sliding valve (20) and a dropper (21) in sequence through hoses; the lower end of a lead screw (27) of a wear measuring mechanism (4) penetrates through a lead screw base (26) to be spherically hinged to a sliding block (25) which is connected with a pressure head (23) through a spring (24), and a wear scale (32) and a load scale (30) are arranged on the side wall of a loading stand column (22); a thermocouple (34) is installed on a thermocouple fixing rod (33) of a temperature measurement mechanism (5), a motor controller (2) is electrically connected with the motor (7), and the thermocouple (34) is electrically connected with a paperless temperature recorder (6). The measurement device for the material wearing capacity and the wearing temperature field has the advantages of being simple in structure, low in cost, convenient to maintain and high in universality.

The invention belongs to the technical field of material chemistry, and relates to a synthesis method of poly-naphthylamine loaded graphene. Poly-naphthylamine is uniformly modified on graphene oxidein an in-situ polymerization mode; then, surface radicals of the graphene oxide are removed through electron beam irradiation; the uniform modification of the poly-naphthylamine on the graphene oxidesurface is realized. The synthetized poly-naphthylamine loaded graphene has good sensibility on benzene series gas.

The invention relates to a preparation method of nano magnetic beads modified by gold nanoparticles, comprising the following steps: 1) dispersing iron ferric oxide nano magnetic beads in a sugar solution, and performing a hydrothermal reaction at 160-220° C. to obtain glycosylation Modified nano magnetic beads; the sugar solution is a monosaccharide solution or an oligosaccharide solution; 2) the glycosylated modified nano magnetic beads are dispersed in a trisodium citrate solution, and then added to a chloroauric acid solution for a reduction reaction to obtain gold Nanoparticle-modified nanomagnetic beads. The preparation process is simple, the surface of the obtained nanometer magnetic beads is evenly modified, and the stability and application performance of the composite magnetic beads are improved at the same time.