917 results about "Carbon dot" patented technology

The invention discloses a method for detecting glufosinate-ammonium residues in coffee in dual modes of colorimetry and chemiluminescence, and belongs to the technical field of chemical analysis and detection.The method comprises the steps that Schiff base formed by 4-aminoantipyrine and glutaraldehyde serves as a complexing agent of Cu < 2 + >, and then a copper-doped carbon dot Cu-CDs nano-enzyme is prepared through microwave digestion; according to the present invention, the Cu-CDs nano-enzyme has excellent peroxidase-like activity, can oxidize the colorless 2, 2 '-biazo-bis-3-ethylbenzothiazoline-6-sulfonic acid into the blue-green oxidized ABTS, and can improve the chemiluminescence intensity of the reaction of N-(4-aminobutyl)-N-ethylisoluminol and H2O2 by nearly 100 times when the Cu-CDs nano-enzyme is used as the chemiluminescence catalyst; based on the inhibition effect of glufosinate-ammonium on the activity of Cu-CDs POD, a sensitive and rapid colorimetric and chemiluminescence two-channel GM detection technology is developed, and the method has potential application value in the aspect of coffee safety monitoring.

The invention discloses a metal-doped carbon quantum dot as well as preparation and application of the metal-doped carbon quantum dot in a nano antibacterial agent, citric acid, urea and tea polyphenol are taken as precursors, metal salt is added, carbon dot synthesis and metal ion doping are synchronously completed in one step through a hydrothermal method, and the metal-doped carbon quantum dot is prepared; the surfaces of the metal-doped carbon quantum dots are negatively charged, and the metal-doped carbon quantum dots have peroxidase-like activity and catalase-like activity at the same time; the metal ions adopt any one of Fe < 3 + >, Cu < 2 + > and Ce < 3 + >; the metal-doped carbon quantum dots are in a sphere-like shape. The metal-doped carbon quantum dots prepared by the preparation method disclosed by the invention have peroxidase-like activity and catalase-like activity at the same time through precise doping of metal ions, and the two activities have a synergistic effect in an oral periodontitis microenvironment, so that a good antibacterial effect is achieved.

The invention relates to a preparation method and application of a carbon dot-based nano enzyme. The preparation method of the carbon dot-based nano-enzyme comprises the following steps: taking sucralose and B vitamins as raw materials, and preparing the carbon dot-based nano-enzyme through a one-pot hydrothermal method. The preparation method of the carbon dot-based nano-enzyme provided by the invention is simpler in catalytic condition and higher in safety. The carbon dot-based nano-enzyme prepared by the invention has the advantages of high oxidase-like activity, low drug resistance, high biocompatibility and the like, can inhibit multi-drug-resistant bacteria, and can be applied to the aspects of aquatic product preservation and the like.

The invention discloses a fluorescence ratio type carbon dot hydrogel sensor, a preparation method thereof and application of the fluorescence ratio type carbon dot hydrogel sensor in rapid detection of doxorubicin hydrochloride. The invention discloses a fluorescence ratio type carbon dot hydrogel sensor which is characterized in that 3-aminophenol is used as a carbon source, absolute ethyl alcohol is used as a solvent, carbon dots are prepared through a one-step solvent method, the carbon dots have green fluorescence, agarose is dissolved in a mixed solution of deionized water and a phosphate buffer solution to be fully dissolved, and then the carbon dots are prepared into the fluorescence ratio type carbon dot hydrogel sensor. And adding the carbon dots into the mixed solution, fully dispersing, and cooling to obtain the fluorescence ratio type carbon dot hydrogel sensor. The sensor disclosed by the invention has the characteristics of high selectivity and high sensitivity when being used for detecting doxorubicin hydrochloride, and also has the characteristics of convenience, visibility, rapidness, portability, easiness in operation and the like.

The invention relates to a structural design, synthesis and application of a biomass carbon dot modified poly L-cysteine-S-S-carboxylic acid amphiphilic polypeptide. The invention provides a structural design, synthesis and application of poly (L-cysteine-S-S-carboxylic acid) amphiphilic polypeptide (P-L-cys) modified by biomass carbon dots (CDs). Comprising synthesis of P-L-cys which contains hydrophobic groups, provides hydrophilic and functionalized carboxyl and provides reduction response by disulfide bonds, synthesis of CDs and CDs modified P-L-cys (CDs (at) P-L-cys), and the macroscopic performance change of the polypeptide is explored from regulation factors of a polypeptide secondary structure and a self-assembly nanostructure assembly mechanism. The P-L-cys and the CDs (at) P-L-cys prepared by the invention have functionalization, fluorescence imaging and dual-response drug release and have particle sizes suitable for drug delivery and enrichment, and the CDs also provide a photo-thermal and photodynamic synergistic treatment effect and have good application prospects in the fields of drug delivery, cancer resistance and the like.

The invention belongs to the field of carbon nanomaterials, and provides a method for preparing a carbon quantum dot material doped with elements such as silicon and aluminum by oxidative depolymerization and stripping of coal gangue. Comprising the steps of screening and matching of coal gangue, oxidative depolymerization stripping, centrifugal dialysis membrane filtration and modification, drying and the like, raw materials and all the steps are specifically set, and the particle size or fluorescence performance of fluorescent carbon dots can be specifically selected and set according to selective oxidative depolymerization stripping conditions. The main particle size of the prepared multi-inorganic-element doped carbon quantum dot material is kept within the range of 1.5-2.0 nm, the structure is stable, the optical performance also meets the requirements, and the material can be further modified and is expected to be applied to the fields of photovoltaic equipment, biological imaging, photocatalytic degradation of organic pollutants or sensing and the like.

The invention relates to a high-temperature-resistant and high-salt-resistant carbon dot-hydrogel blocking agent and a preparation method and application thereof.The preparation method comprises the following steps that a reaction monomer, an initiator, an organic cross-linking agent and an inorganic cross-linking agent are added into water to be evenly mixed, and a precursor mixed solution is obtained; adding a polysaccharide polymer into the precursor mixed solution, and stirring and dissolving to obtain a hydrogel prepolymer; polymerizing and partially hydrolyzing the hydrogel prepolymer to obtain partially hydrolyzed interpenetrating network hydrogel; the partially hydrolyzed interpenetrating network hydrogel is carbonized at the constant temperature of 50-70 DEG C to form carbon dots, and the carbon dot-hydrogel blocking agent is obtained. The prepared carbon dot-hydrogel has the advantages that synthesis is green, raw materials are easy to obtain, and toxic reagents do not need to be introduced; the nano enhancement effect of the carbon dots and the physical entanglement effect of the polysaccharide polymer enable the obtained hydrogel to have high toughness and compression strength after high salinity and high-temperature aging, and the hydrogel can be used for profile control and water shutoff of high-temperature and high-salinity oil reservoirs so as to improve the recovery rate of crude oil.

The invention relates to a gadolinium-doped carbon dot complex based on liver cancer cell membrane coating and a preparation method of the gadolinium-doped carbon dot complex. The gadolinium-doped carbon dot complex is prepared on the basis of gadolinium-doped carbon dots Gd-CDs which are prepared from indocyanine green, citric acid, polyethylene glycol and gadolinic acid through a one-step microwave thermal method and have fluorescence-magnetic resonance bimodal imaging capacity. The Gd-CDs complex Gd-CDs coated HCM is placed in a cell membrane suspension extracted from human hepatoma carcinoma cells HepG2, and the Gd-CDs complex Gd-CDs coated HCM which is uniform in particle size and has the capacity of photothermal and immunotherapy of hepatocellular carcinoma is obtained through extrusion construction of a liposome extruder. The Gd-CDs (at) HCM complex constructed by the invention not only has good bimodal imaging ability, but also has a specific inhibition effect on liver tumor cells, can be applied to preparation of drugs for inhibiting the growth of the liver tumor cells, and realizes a good treatment effect on liver cancer at a nanometer level.

The invention relates to the technical field of pharmaceutical preparations, in particular to a preparation process of carbon dots for killing helicobacter pylori and application of the carbon dots in oral pharmaceutical preparations. The preparation method comprises the following steps: mixing microcrystalline cellulose and glycerol, freezing and crushing at an ultralow temperature, and selectively hydrolyzing by combining citric acid-malic acid mixed acid liquor to efficiently prepare a high-crystallinity cellulose nanocrystal template; the controllable synthesis of the carbon dots is realized by utilizing the hydrogen-bond interaction of hydroxyl / carboxyl on the surface of the cellulose nanocrystal and the nitrogen doping effect in the polymerization and carbonization process of citric acid and urea. Besides, when a sodium alginate-chitosan double-layer structure is constructed, carbon dots are introduced into the inner layer to endow the inner layer with special performance, a protein-polysaccharide network is formed on the outer layer through transglutaminase enzymatic crosslinking, and the oxidation resistance and mechanical strength are enhanced through secondary curing of tea polyphenol. According to the invention, food-grade raw materials are used for realizing high-efficiency antibiosis, the oral preparation safety specification is met, and the clinical transformation potential is realized.

The invention discloses an anti-ultraviolet high-flame-retardant polyester fiber and a preparation method thereof. The polyester fiber is prepared from the following raw materials in parts by weight: 100 parts of polyester chips, 20-60 parts of core-shell flame-retardant anti-ultraviolet particles and 2-4.5 parts of an anti-dripping agent. According to the invention, a porous alumina-titanium dioxide compound is used as a carrier, a magnesium hydroxide flame retardant, iron-doped carbon dots with photo-thermal performance and auxiliaries (an antioxidant and an ultraviolet light absorber) are combined with the carrier to construct a structural system loaded with multiple active components: functionalized flame-retardant particles, and then a polyurethane microporous membrane is coated, so that the flame-retardant polyurethane composite material is obtained. The core-shell type flame-retardant anti-ultraviolet particles are added into polyester fibers, so that the anti-ultraviolet performance and the flame-retardant performance of the polyester fibers can be remarkably improved. The polyester fiber provided by the invention can adaptively increase the release rate of the ultraviolet absorbent and the antioxidant when the ultraviolet property is enhanced in the environment, so that more optimized protection can be provided for a polyester fiber matrix at the moment.

The invention provides a ratiometric fluorescence sensing system and a preparation method and application thereof, and the preparation method comprises the following steps: respectively preparing a silicon oxide-based aggregation-induced emission material and a copper-doped carbon dot material, and mixing the silicon oxide-based aggregation-induced emission material and the copper-doped carbon dot material with an ascorbic acid-2-phosphoric acid material to construct the ratiometric fluorescence sensing system. The fluorescent probe is applied to ferric ion detection, in-vitro detection of biomarkers or fluorescence imaging. The technical scheme provided by the invention has good stability, accuracy and practical application potential.

The invention discloses a method for detecting L-cysteine in serum based on N, S co-doped carbon nanodots, and belongs to the field of analysis and detection. The method comprises the following steps: (1) preparing carbon dots by taking beta-mercaptoethylamine and p-phenylenediamine as precursors; (2) after Fe < 3 + > is added into the carbon dot solution, a carbon dot fluorescence quenching phenomenon occurs, and a carbon dot-Fe < 3 + > mixed system is obtained; then adding L-cysteine into the carbon dot-Fe < 3 + > mixed system to gradually recover the fluorescence of the system; and (3) constructing a linear relationship between the concentration of the L-cysteine and the fluorescence recovery degree to obtain the quantitative detection model for the L-cysteine in the serum sample. According to the method, the carbon dots are prepared by taking beta-mercaptoethylamine and p-phenylenediamine as precursors for the first time, quantitative detection of L-cysteine is realized, and the method is low in cost, high in sensitivity, suitable for field rapid detection and relatively high in practical value and popularization prospect.

The invention provides a preparation method of nitrogen and phosphorus-doped carbon dots and application of the nitrogen and phosphorus-doped carbon dots in quercetin detection, the nitrogen and phosphorus-doped fluorescent carbon dots (N, P-CDs) are successfully constructed for the first time by adopting a hydrothermal synthesis method, and the carbon dots have emission peaks at 465 nm under the excitation wavelength of 325 nm and show green fluorescence under the irradiation of an ultraviolet lamp; quinine sulfate is used as a standard reference substance, and the quantum yield is 1301%; an N, P-CDs solution is used as a probe molecule, after quercetin is added, fluorescence quenching of N, P-CDs is induced, and the concentration of quercetin and the fluorescence intensity of N, P-CDs are linearly changed, so that the method can be used for quantitative detection of quercetin. The N, P-CDs preparation method provided by the invention is simple and rapid, the product property is stable and non-toxic, the detection sensitivity on the quercetin is high, and the N, P-CDs can be used for detecting the content of the quercetin in serum.

The invention belongs to the technical field of nano functional materials and intelligent textiles, and particularly discloses a preparation method and application of high-brightness nitrogen-doped carbon quantum dots based on phycocyanin. The method is used for solving the problems of large difference and poor reproducibility when the same biomass in different batches is used for preparing the carbon dots in the prior art. Comprising the following steps: (1) freeze-drying spirulina, and grinding into powder to obtain spirulina powder; (2) extracting phycocyanin by utilizing spirulina powder; (3) phycocyanin is added into the reaction container, then distilled water is added, the adding amount ratio of phycocyanin to distilled water is 1 g: 33.3-50 mL, and full stirring is conducted; and then, carrying out carbonization treatment, cooling to room temperature, collecting the solution, and dialyzing for 24 hours, so that the solution outside a dialysis bag is a purified carbon quantum dot solution. According to the method, the phycocyanin is used as a single nitrogen source for the first time, the reproducibility of preparing the carbon dots from the same biomass in different batches is good, and large-scale production is facilitated.

The invention discloses a preparation method of a graphite phase carbon nitride / titanium dioxide photo-anode based on carbon dot modification. The preparation method comprises the following steps: firstly, preparing graphite-phase carbon nitride and a carbon dot diluent, adding the graphite-phase carbon nitride and the carbon dot diluent into a precursor solution of titanium dioxide, dispersing and fusing, and growing a composite photocatalyst on conductive glass through in-situ hydrothermal treatment to obtain the photo-anode. The optimal material ratio is analyzed through characterization means such as electrochemical test and ultraviolet diffuse reflection spectrum. The optimal reaction condition of the photo-anode is explored by constructing the double-electrode photocatalytic fuel cell.

The invention relates to an enzyme response antibacterial carbon dot and a preparation method and application thereof.The carbon dot takes a copper-doped carbon dot as a core and is covalently grafted with a hyaluronic acid shell layer through amidation reaction to form a composite nano material Cu-CDs (at) HA, specifically, soluble copper salt and folic acid are subjected to a hydrothermal reaction to obtain the copper-doped carbon dot, carboxyl is activated through EDC / NHS in a buffer system, and the carbon dot is prepared. And performing grafting reaction with hyaluronic acid to obtain a target product. The hyaluronidase-containing antibacterial composition can be specifically degraded and release antibacterial components under the action of hyaluronidase, shows good bacterial responsive bactericidal performance, has the minimum inhibitory concentrations of 8 g / mL and 16 g / mL for staphylococcus aureus and escherichia coli respectively, and has peroxidase-like activity and free radical scavenging capacity. The antibacterial carbon dots can be used for preparing intelligent wound dressings, antibacterial coatings and other biomedical materials, and have the advantages of responsive drug release, efficient antibacterial property and promotion of wound repair.

The invention provides a hybrid bionic nano delivery system and a preparation method thereof. The hybrid bionic nano delivery system is composed of a carbon dot doped nitrogen carbide-based nanoparticle core and a cell membrane group wrapping the nitrogen carbide-based nanoparticle core. The invention constructs a hybrid bionic nano delivery system, which has good biocompatibility and biological metabolism, is beneficial to application in the field of biomedicine, and can realize low-temperature photothermal therapy of hepatic fibrosis. The carbon nitride-based nano bionic system constructed by the invention is mainly synthesized by high-temperature calcination, ultrasonic treatment and hybrid cell membrane wrapping. The preparation method disclosed by the invention is simple, has good repeatability and has a relatively good industrial production prospect.

The invention relates to a microalgae photosynthetic carbon sequestration technology, and aims to provide a method for promoting microalgae carbon sequestration by a polyethylene glycol passivated nitrogen-doped carbon dot conversion spectrum. The method comprises the following steps: passivating the surfaces of nitrogen-doped carbon dots by using polyethylene glycol, and then directly adding the passivated nitrogen-doped carbon dots into a microalgae suspension, ultraviolet light with the wavelength of 280-390 nm in external light is converted into blue light with the wavelength of 400-500 nm by passivating the nitrogen-doped carbon dots so as to be directly utilized by microalgae, so that growth and carbon sequestration are promoted while the stress resistance of algae cells is improved. According to the method, damage to algae cells can be greatly reduced by converting an ultraviolet spectrum, and meanwhile, microalgae growth and carbon sequestration can be further promoted by converting ultraviolet light into blue light; the spectrum conversion effect is enhanced, the overall light energy utilization efficiency of microalgae carbon sequestration is improved, light inhibition is relieved, and the stress resistance of microalgae cells is improved, so that microalgae growth carbon sequestration is promoted, and the development of the microalgae carbon sequestration industry is promoted.

The invention discloses a method for detecting aflatoxin B1 in coffee based on colorimetric and photo-thermal dual modes of MXene (at) Pt nano-enzyme, which comprises the following steps: etching Ti3AlC2 by using LiF and HCl to obtain MXene, synthesizing platinum nano-particle modified MXene nano-enzyme (MXene (at) Pt) by using dopamine carbon dots and sodium borohydride as reducing agents and adopting an in-situ reduction technology, and detecting aflatoxin B1 in coffee by using the MXene (at) Pt nano-enzyme (MXene (at) Pt nano-enzyme (MXene (at) Pt nano-enzyme (MXene (at) Pt nano-enzyme (MXene (at) Pt). The MXene (at) Pt shows near-infrared light stimulation enhanced peroxidase-like activity and photo-thermal performance and can catalyze blue deepening and temperature rising of a substrate 3, 3 ', 5, 5'-tetramethyl benzidine (TMB), when aflatoxin B1 exists, POD-like activity of MXene (at) Pt nano-enzyme is inhibited, and colorimetric and temperature signals are reduced; a method for detecting the AFB1 by the colorimetric temperature dual-mode sensor is established, and the method has the characteristics of high sensitivity, strong specificity, simplicity and rapidness in operation and the like.

The invention aims to provide a dual-channel Fabry-Perot cavity optical fiber pressure sensor with high reliability and high precision and a preparation method thereof, the dual-channel Fabry-Perot cavity optical fiber pressure sensor comprises a base, a pressure-sensitive diaphragm and an optical fiber, the pressure-sensitive diaphragm is hydrogel based on a PVA-boric acid complex structure, a carbon dot fluorescent nano-material is doped in the hydrogel, and the optical fiber is doped in the carbon dot fluorescent nano-material. The dual-channel optical system comprises a pressure sensing channel for detecting the change of a Fabry-Perot cavity interference spectrum by adopting a broadband light source, and a damage monitoring channel for exciting carbon dot fluorescence by adopting an excitation light source and judging diaphragm damage through the change of fluorescence signal intensity. The pressure-sensitive diaphragm based on a PVA-boric acid complex structure has a self-repairing function and can drift for a long time; 0.5% F.S. / month, the service life of the sensor is prolonged, and the accuracy of pressure acquisition is improved; meanwhile, a carbon dot fluorescent nano-material with excellent biocompatibility is doped into the pressure-sensitive diaphragm, so that real-time self-monitoring of optical damage is realized, and the carbon dot fluorescent nano-material is used as an auxiliary function to improve the reliability of pressure acquisition of the sensor.

The invention discloses a dual-emission carbon dot nano-enzyme, a preparation method thereof and application of the dual-emission carbon dot nano-enzyme in enhancing photosynthesis and salt stress resistance of crops, and relates to the field of nano-material technologies and agricultural engineering.The dual-emission carbon dot nano-enzyme is prepared by taking glutathione and formamide as precursors through ultrasonic treatment, microwave heating, purification and drying; the double-emission carbon dots have emission in blue light and red light ranges, are well overlapped with chloroplast absorption, and can be used as a light converter to promote photosynthesis of crops, improve the utilization rate of solar energy and enhance photosynthesis of crops; in addition, the compound has excellent SOD-like activity, and can improve germination of crop seeds and growth of seedlings under salt stress.

The invention relates to the technical field of biological denitrification, in particular to a nitrogen-doped carbon dot-based microbial electronic control denitrification system and application thereof. The system comprises electron donor microorganisms, electron acceptor microorganisms and nitrogen-doped carbon dots, the nitrogen-doped carbon dots serve as electron mediators outside cells, an efficient extracellular electron transfer network is constructed, and interspecific electron transfer resistance is reduced; meanwhile, the nitrogen-doped carbon dots can regulate and control intracellular electron transport chains and the energy metabolism process, the improvement of the reducing power and the energy level is promoted, and the metabolism mode optimization is realized. By cooperatively regulating and controlling generation, transmission and utilization of electrons under an extreme electron donor limited oligotrophic condition, the system disclosed by the invention can realize efficient denitrification, avoid nitrite accumulation, remarkably inhibit generation of nitrous oxide (N2O), reduce dependence on an external organic carbon source and an electron source, and improve the denitrification efficiency. And a new technical approach is provided for improving the deep denitrification efficiency under the low-carbon condition.

The invention discloses preparation of high-quantum-yield carbon dots based on machine learning guidance and detection application of a hydrogel kit of the high-quantum-yield carbon dots, and relates to the technical field of fluorescent nano material preparation and sensors. The method comprises the following steps: inputting reaction parameter data of synthesis of various carbon dots into a machine learning model, obtaining an optimal influence factor according to a prediction result, and realizing synthesis of the high-quantum-yield carbon dots. The carbon dot is in a sphere-like shape, the average particle size is 2.12 nm, the carbon dot has high fluorescence intensity, and an adopted precursor material is waste paper which is wide in source and low in cost. The synthesized high-quantum-yield carbon dots have the advantages of being rapid and sensitive in detection and the like, and mercury ions in Chinese herbal medicines can be rapidly detected according to fluorescence signal quenching. Meanwhile, the preparation of the carbon dot hydrogel kit can further realize colorimetric sensing, and the carbon dot hydrogel kit has good application value and prospect in the fields of environment, medicine, food and the like.

The invention discloses a preparation method and application of a dual-channel multifunctional multicolor fluorescent probe, and relates to the technical field of fluorescent sensing detection.The dual-channel multifunctional multicolor fluorescent probe is prepared through the following steps that pyromellitic acid and ZrCl4 solids are dispersed in deionized water, Zr-MOF is prepared through a hydrothermal method, pamoic acid and melamine are dispersed in deionized water, and the Zr-MOF is prepared through a hydrothermal method; the preparation method comprises the following steps: preparing green fluorescent carbon dots (CDs) by using a hydrothermal method, dispersing the CDs and Zr-MOF in deionized water according to a certain proportion, reacting, collecting a brown solid, washing, drying, dispersing the solid in ethanol, adjusting the pH to be alkaline, adding Eu (NO3) 3.6 H2O, reacting, filtering, and drying in vacuum to obtain a target probe. The probe can accurately distinguish Cu < 2 + > ions of tetracycline antibiotics (TCs) through two independent fluorescent channels, not only displays completely independent spectral response, but also has the advantages of self-calibration, high sensitivity, interference resistance, field visual detection and the like. The multifunctional fluorescent probe has important significance for improving detection efficiency, reducing cost and energy consumption, optimizing resource utilization and promoting green low-carbon economy.

A method for synthesizing nitrogen-doped carbon quantum dots. The method includes reacting a mixture of a fruit waste material, a nitrogen source, and deionized water hydrothermally in an autoclave at a reaction temperature in a range of 150° C. to 250° C. to form a nitrogen-doped carbon quantum dot containing suspension. The method includes centrifuging the carbon quantum dot containing suspension to separate the nitrogen-doped carbon quantum dots from a hydrochar. The method includes filtering the nitrogen-doped carbon quantum dot containing suspension to obtain the nitrogen-doped carbon quantum dots. The nitrogen-doped carbon quantum dots have a size ranging from 1 to 5 nanometers (nm). The nitrogen-doped carbon quantum dots have a Stokes shift of at least 140 nm at an excitation wavelength of 300-420 nm.

The invention relates to the technical field of new energy automobile materials, in particular to a high-performance packaging material for an automobile energy storage system and a packaging technology, and the packaging material for the automobile energy storage system comprises the following components: an organic silicon-carbon nanotube-graphene-MOF hybrid polymer containing rare earth elements; a lithium salt-ionic liquid compound is loaded on the hollow titanium dioxide microspheres; a phosphorus-silicon-boron containing synergistic flame retardant; the invention discloses an intelligent phase change microcapsule-carbon dot composite material. A difunctional ionic liquid plasticizer; a photocatalysis-photothermal antibacterial agent; a two-dimensional boron nitride nanosheet; the invention relates to bio-based PLGA. Through multi-component cooperation and process innovation, high thermal conductivity, strong flame retardance and excellent mechanical properties are achieved, the rare earth hybrid polymer improves interface bonding, and MOF channels promote ion transmission; the phosphorus-silicon-boron flame-retardant system forms a glassy protective layer; the bio-based PLGA improves the degradation rate; the magnetic field induction and pulse hot pressing process optimizes the filler arrangement and density, and ensures the stability of large-scale production.

The invention provides fluorescent carbon dots and fluorescent hydrogel based on solvent stimulation response discoloration and a preparation method and application of the fluorescent carbon dots and the fluorescent hydrogel, and belongs to the technical field of fluorescent materials and information encryption. The preparation method of the fluorescent carbon dots comprises the following steps: mixing a biomass carbon source and a solvent, and performing solvothermal reaction to obtain the fluorescent carbon dots, the biomass carbon source comprises one or more of buxus buxus, oriental cherry leaves, fructus forsythiae leaves and oak leaves; the solvent is ethanol. The biomass carbon dots are low in toxicity, excellent in optical stability and photobleaching resistance and high in ionic strength; the fluorescent carbon dots have double emission peaks of red light and blue light / green light, are different from single fluorescent carbon dots, and can provide more fluorescent information storage density for a fluorescent gel-based information orientation encryption system. The fluorescent color of the fluorescent hydrogel can be stably switched in an ethanol / water solvent, the gel structure is stable, the information storage capacity is improved, and a fluorescent hydrogel-based information anti-counterfeiting encryption system is promoted to develop towards multiple dimensions.

The invention discloses a flexible self-powered triboelectric sensor, and belongs to the technical field of sensors, the flexible self-powered triboelectric sensor comprises a first silicone rubber layer, a hydrogel layer, a conductive silica gel electrode layer and a second silicone rubber layer which are sequentially arranged from top to bottom, the hydrogel layer is prepared from N-isopropylacrylamide (NIPAM), N, N-dimethylacrylamide (DMAA), N, N-dimethylacrylamide (DMAA), N, N-dimethylacrylamide (DMAA) and N, N-dimethylacrylamide (DMAA); n, N '-methylene bisacrylamide (MBA) and sodium alginate (SA) are copolymerized to form a three-dimensional network, in-situ embedding of biological source orange juice carbon dots is initiated through ultraviolet light, and the first silicone rubber layer, the hydrogel layer, the conductive silica gel electrode layer and the second silicone rubber layer are bonded and fixed on the periphery through silica gel. The invention discloses a green, safe and high-performance flexible triboelectric sensor, which realizes excellent electrical output through a simple process and is combined with an advanced signal processing technology to realize accurate recognition of multiple key physiological signals by a single sensor.

The invention discloses a preparation method of carbon quantum dots with waste coffee grounds as a carbon source and preparation and application of a carbon dot coating antibacterial fabric, the coffee grounds are used as the carbon source, a hydrothermal method is adopted for reaction, and the carbon quantum dots are prepared through the steps of centrifugation, filtration, dialysis, distillation, freeze drying and the like of a synthetic solution. The carbon dot coating antibacterial fabric is prepared by simply dipping the fabric in the carbon dot solution. The antibacterial properties of the carbon quantum dots and the carbon dot coated fabric are evaluated through the antibacterial activity of staphylococcus aureus. The prepared carbon dots and staphylococcus aureus are mixed and cultured for several hours, then a bacterial solution is coated on an LB solid culture medium, and the bacterial solution is continuously cultured in an incubator at 37 DEG C to test the antibacterial property of the LB solid culture medium. The antibacterial property of the carbon dot coating antibacterial fabric passes through an inhibition zone test method. Tests find that the prepared carbon quantum dots and the antibacterial fabric are high in antibacterial property, and the application requirements of various antibacterial materials are met.

The application discloses a preparation method of a multifunctional novel carbon dot gelatin / chitosan-based intelligent packaging film, relates to the technical field of packaging films, and discloses the following steps: firstly, using white hedyotis diffusa and citric acid as raw materials, multifunctional carbon dots are synthesized through a one-step hydrothermal method, and the carbon dots are uniformly dispersed in a gelatin / chitosan-based film. After the carbon dots are added, the prepared packaging film not only exhibits excellent antioxidant, antibacterial, ultraviolet-proof and pH response performances, but also has a significantly enhanced mechanical strength. The intelligent packaging film has environmental protection characteristics, helps to reduce environmental pollution, and can realize the monitoring function of the freshness of pork.