1428 results about "Carbon dot" patented technology

The invention belongs to the technical field of hydrogel materials, and particularly relates to a preparation method of carbon dot-based super-strong hydrogel. The carbon-dot-based super-strong hydrogel is prepared by taking specific carbon dots (citric acid carbon dots, tannic acid carbon dots, malic acid carbon dots or bark carbon dots) as nano-filler and salting-out-assisted progressive stretching, the specific carbon dots are used as the nano-filler, and the HofMichast effect sensitive characteristic of polyvinyl alcohol is utilized, so that the carbon-dot-based super-strong hydrogel is prepared. Carbon dots and salting-out progressive stretching are combined to construct the super-strong hydrogel, and the super-strong hydrogel is simple in preparation process and excellent in performance.

The invention provides a ratio type molecular imprinting fluorescence sensing detection method based on a metal organic framework and nitrogen-doped carbon dots, the advantages of N-CDs, Eu-MOF and a molecular imprinting layer are fused, in the presence of target molecules, the blue fluorescence (430nm) of the N-CDs is effectively enhanced due to non-radiative recombination caused by the surface defect state of the CDs, and the red fluorescence (660nm) of the Eu-MOF remains unchanged. According to the ratio type molecularly imprinted fluorescent sensing detection method, while a fluorescent response signal is displayed, the color of the imprinted polymer changes along with different concentrations of the target molecules, and sensitive visual detection of the target molecules can be realized, so that specific sensitive detection of the target molecules in a complex sample is realized; the method has the advantages of high sensitivity, simplicity and convenience in operation, good reproducibility, strong anti-interference performance and the like. According to the method, rapid and sensitive detection of organophosphorus pesticides, toxic agents and other imprinted molecules can be realized by preparing imprinted polymers of different target molecules without fluorescence interference, and the method has a wide application prospect.

The invention discloses an amphiphilic carbon dot, a clean fracturing fluid and application of the clean fracturing fluid. The amphiphilic carbon dot is prepared by performing solvothermal reaction on organic acid and a hydrophobic aliphatic compound. According to the amphiphilic carbon dots provided by the invention, simple preparation of the amphiphilic carbon dots with different structures and properties can be realized by changing the types of the hydrophobic aliphatic compounds, and the clean fracturing fluid prepared by utilizing the amphiphilic carbon dots not only has high temperature resistance and is suitable for reservoirs with relatively high temperature, but also has high salt resistance, so that the clean fracturing fluid can be used for preparing the clean fracturing fluid. And the fracturing fluid has a good fracturing effect in hydrofracture operation of low-permeability and high-salinity oil reservoirs.

The invention discloses a CDs / QDs (at) ZIF-8 probe, a preparation method of the CDs / QDs (at) ZIF-8 probe and application of the CDs / QDs (at) ZIF-8 probe to detection of tetracycline at three emission ratios, and belongs to the technical field of fluorescence sensing. The probe comprises ZIF-8 as well as a carbon dot and a cadmium telluride quantum dot which are encapsulated in the ZIF-8. The preparation method comprises the following steps: sequentially adding CDs and QDs into a 2-methylimidazole solution, uniformly mixing, dropwise adding a zinc salt solution, and reacting to obtain the CDs / QDs ZIF-8 probe. The probe can be used for performing three-emission-ratio fluorescent quantitative detection on tetracycline, and the detection limit is 14.2 nmol / L. The method is simple in synthesis steps and easy in condition control. The fluorescent color of the mixed solution of CDs / QDs ZIF-8 and tetracycline is changed from powder to green along with the increase of the concentration of tetracycline, the detection method is visual and rapid, the visualization effect is good, the detection gel can be prepared, the detection gel can be combined with a smartphone for use, and the method is simple, convenient to carry and convenient for field judgment.

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 discloses a polyvinyl alcohol composite film as well as a preparation method and application thereof in food coloring detection. The polyvinyl alcohol composite film is prepared from raw materials including phenylboronic acid modified carbon dots and polyvinyl alcohol through a thermocuring reaction, a phenylboronic acid group on the surface of the phenylboronic acid modified carbon dot and polyvinyl alcohol form a reversible covalent bond crosslinking point based on boric acid ester so as to form a dynamic three-dimensional network, and the structural formula of the phenylboronic acid modified carbon dot is # imgabs 1 #. The phenylboronic acid modified carbon dot is simple in process, easy to process and form and simple and convenient to use; compared with the prior art, the carbon dots modified by phenylboronic acid groups and the polyvinyl alcohol are added, the crosslinking effect between the carbon dots modified by the phenylboronic acid groups and the polyvinyl alcohol is remarkably enhanced, the mechanical strength and water resistance of the composite film are improved, the food coloring detection capacity of the composite film is improved, and in addition, the composite film further has the characteristic of being capable of being reprocessed, so that the composite film has wide application value.

The invention discloses a preparation method of an amphiphilic carbon dot, the amphiphilic carbon dot and application of the amphiphilic carbon dot. According to the amphiphilic carbon dots, at least one of phenol, catechol, resorcinol or hydroquinone is used as a first precursor, and at least one of urea, aniline, o-phenylenediamine or 1, 2, 4-triaminobenzene is selected as a second precursor; after mixing and dissolving, reacting for 4-8 hours under the condition of 180-220 DEG C to prepare initial carbon dots; separating and purifying the initial carbon dots in a chromatographic column, collecting a second component, removing the solvent through rotary evaporation, and drying to obtain the amphiphilic carbon dots. The degreasing agent prepared from the obtained amphiphilic carbon dots has strong adsorption capacity, low toxicity and good stability, can effectively remove oil stains, has the characteristic of low foam in the use process, simplifies the cleaning process and improves the efficiency.

The invention discloses a preparation method of a coal-based yellow fluorescent carbon dot aqueous solution, which comprises the following steps: drying lignite to constant weight, grinding, sieving to obtain a primary coal sample, and weighing the primary coal sample; adding the weighed primary coal sample into a mixed solution of peracetic acid and hydrogen peroxide, stirring, and filtering to obtain a pretreated coal sample; the method comprises the following steps: mixing a coal sample with water, stirring to obtain a lignite solution, transferring the lignite solution into a cavitation device, starting a cavitation program, and adjusting and maintaining the flow; collecting circulating liquid in the cavitation device, and filtering to remove residual large particles to obtain an aqueous solution of the coal-based carbon dots; the method comprises the following steps: pretreating a coal sample by using a mixed solution of peracetic acid and hydrogen peroxide, and stripping the coal sample by combining a hydrodynamic cavitation method to prepare a carbon dot with yellow fluorescence; the method is low in cost, environmentally friendly, simple in equipment and huge in large-scale production potential, and a new method and thought are provided for enriching polychromaticity of the coal-based carbon dots.

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 provides a method for improving adhesion of photoresist and a wafer, which comprises the following steps: providing a wafer, forming a carbon dot layer on the surface of the wafer, the carbon dot layer comprising a plurality of carbon dots, and all the carbon dots being randomly distributed on the surface of the wafer; a patterned photoresist layer is formed on the surface of the wafer, the patterned photoresist layer is provided with an opening, part of the carbon dot layer is exposed out of the opening, and the patterned photoresist layer on the outer side of the opening covers the remaining part of the carbon dot layer; etching a part of thickness of the wafer by taking the patterned photoresist layer as a mask; and removing the photoresist layer and the carbon dot layer. According to the invention, the carbon dot layer in which the carbon dots are randomly distributed is formed between the surface of the wafer and the photoresist layer, so that a good contact surface is formed between the photoresist layer and the wafer, and the adhesion between the photoresist layer and the wafer is improved.

The invention provides an application of a cross-linked decellularized bovine amniotic membrane (CAM) and manganese carbon dots (Mn CDs) combined in preparation of an ophthalmic medical material for alkali burn cornea repair. The invention further provides a compound for repairing the alkali burn cornea. Cell and animal experiments show that the compound CDs (at) CAM has good biocompatibility and strong antioxidant and anti-inflammatory effects, can significantly promote corneal epithelium regeneration and inhibit corneal neovascularization and scar generation, and provides a new strategy for treatment of alkali burn cornea and various corneal epithelium injuries and diseases.

The invention relates to a preparation method of a zeolite imidazole frame-8 double-site loaded carbon dot and gold or gold and silver nanocluster fluorescent material, which comprises the following steps of: 1, uniformly mixing a HAuCl4 aqueous solution and a GSH aqueous solution at room temperature, or uniformly mixing an AgNO3 aqueous solution, the HAuCl4 aqueous solution and the GSH aqueous solution, then stirring for 20-28 hours at 60-80 DEG C, cooling to room temperature, adding methanol, centrifuging, and drying to obtain a precursor solution of the zeolite imidazole frame-8 double-site loaded carbon dot and gold or gold and silver nanocluster; washing and drying to obtain gold or gold-silver nanoclusters, and dispersing the gold or gold-silver nanoclusters in water for later use; step 2, preparing carbon dots CDs; 3, zinc nitrate hexahydrate and 2-methylimidazole are added into methanol containing CDs under the stirring condition to react for 20-28 hours, centrifugation and washing are conducted, and a product ZIF coated CDs is obtained; and 4, mixing the gold or gold and silver nanocluster solution with the ZIF-coated CDs under an ultrasonic condition at room temperature to obtain the ZIF-coated CDs / gold / silver nanocluster composite material. The invention also provides an application of the zeolite imidazole frame-8 double-site loaded carbon dot and gold and silver nanocluster fluorescent material in detection of pesticide triazophos (TZP) and glucose.

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 belongs to the technical field of fluorescence detection, and provides a dual-emission carbon dot, a visual hydrogel sensing platform prepared from the dual-emission carbon dot and application of the dual-emission carbon dot in order to solve the problem that field real-time detection cannot be realized in current tetracycline detection. The dual-emission fluorescent carbon dots DE-CDs are synthesized by dissolving toluene diisocynate, fennel and m-phenylenediamine (m-PD) in ultrapure water to serve as precursors, and reacting for 6 hours by controlling the reaction temperature to be 220 DEG C through a one-pot hydrothermal method. Two emission wavelengths (432 nm and 515 nm) are shown under different excitation wavelengths. A fluorescence sensor with double response signals is constructed and used for detecting tetracycline. The sensor shows a very strong index relationship in the range of tetracycline of 0-118 [mu] M, and the detection limit is 53.4 nM. A fluorescent hydrogel detection platform integrated with a smart phone is established, and rapid, portable and on-site detection of tetracycline in a water sample is successfully realized. And an effective strategy is provided for combination of laboratory precision testing and on-site rapid testing.

The invention discloses a near-infrared fluorescent carbon dot capable of efficiently marking sEVs and application of the near-infrared fluorescent carbon dot. Urea, citric acid and Nile blue are used as precursors, and the carbon dot is prepared through a one-step solvothermal method; then activating carboxyl on the surface of the carbon dot under the action of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride to be combined with N-hydroxysuccinimide, so as to prepare the near-infrared fluorescent carbon dot, namely CDs-NHS. The method comprises the following steps: mixing CDs-NHS with sEVs or cells containing the sEVs, and marking the sEVs; the near-infrared fluorescent carbon dots are used for marking, marking conditions are mild, operation is easy, and the near-infrared fluorescent carbon dots have good specificity, pH tolerance and low cytotoxicity and have the advantages of being excellent in light stability and the like compared with small-molecule dye.

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 the field of novel display material quantum dot materials, and discloses a preparation method of a carbon dot-based anti-blue light film. The preparation method comprises the following steps: (1) weighing perylene and PTCDA or perylene and propylene diamine as reaction precursors according to a molar ratio of perylene to PTCDA / propylene diamine of (1-5): 1; (2) adding an ethanol-sulfuric acid solution or DMF (Dimethyl Formamide) into the reaction precursor, and carrying out solvothermal reaction in a hydrothermal reaction kettle; the perylene: ethanol sulfuric acid solution or DMF = 1 mmol: (3-20) mL; (3) after the solvothermal reaction is completed, filtering, centrifuging and dialyzing a reaction solution, and finally drying to obtain the carbon dots; and (4) mixing and dispersing polystyrene and the carbon dots in toluene, and spin-coating to prepare the carbon dot-based anti-blue light film. The prepared carbon dots can be used for preparing an anti-blue-light film at a low doping ratio, CIE coordinates do not shift, and the color is not distorted.

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 discloses a preparation method and application of stimuli-responsive wide-gamut color-changing phosphorescent carbon dots, and the preparation method comprises the following steps: S1, at 180-250 DEG C, taking levofloxacin and acid as reaction raw materials, and carrying out hydrothermal reaction in an aqueous solution for 1-8 hours; s2, cooling a reaction product obtained by the hydrothermal reaction, and performing centrifugal separation to obtain a reactant solution; and S3, drying the obtained reactant solution to obtain the stimuli-responsive wide-color-gamut color-changing phosphorescent carbon dots. The preparation method of the stimuli-responsive wide-gamut color-changing phosphorescent carbon dots is simple, the raw materials are wide in source and easy to obtain, the reaction conditions are mild, the yield is high, and the carbon dots are green, pollution-free, low in toxicity and suitable for batch production; the stimuli-responsive wide-color-gamut color-changing phosphorescent carbon dot material fills the blank of wide-color-gamut color-changing phosphorescent carbon dot materials, solves the problem that stimuli-responsive wide-color-gamut color-changing phosphorescent carbon dots are difficult to prepare, and can be used for phosphorescent color display, advanced information encryption and food freshness monitoring.

The present invention provides a method for preparing a fluorescent sensor array for detecting heavy metal ions, the method comprising: mixing a cetylpyridinium chloride solution with a sodium hydroxide solution, then performing water bath ultrasound, purifying with dichloromethane, and then dialyzing with a dialysis bag to obtain a CPC-CDs solution; adding heavy metal ion solutions of different concentrations to CPC-CDs / XO sensing solutions under two groups of pH environments to obtain a fluorescent sensor array. Also provided is an application for detecting heavy metal ions Cr 6+ , Fe 2+ , Fe 3+ , and Hg 2+ The present invention simplifies the array construction steps by adjusting the pH environment of the system, and effectively improves the lack of affinity between carbon dots and heavy metal ions by adding xylenol, and can simultaneously detect multiple metal ions (Cr 6+ , Fe 2+ , Fe 3+ , and Hg 2+ ), with high sensitivity and good selectivity, is used for the detection of heavy metals in the environment.

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 a preparation method of a carbon dot nano-enzyme, which comprises the following steps: dissolving oxalic acid, polyethyleneimine and ferric nitrate in ultrapure water, heating, mixing and reacting, cooling to room temperature, centrifuging, filtering, dialyzing, and taking supernate to obtain the carbon dot nano-enzyme. The prepared oxalic acid carbon dot nano-enzyme is matched with acetylcholin esterase, acetylcholine, 3, 3 ', 5, 5'-tetramethyl benzidine and H2O2 to construct a colorimetric and fluorescent dual-mode detection method for glyphosate in fruits and vegetables. The oxalic acid carbon dot nano-enzyme is prepared by doping ferric nitrate and tetraethylenepentamine into oxalic acid serving as a precursor, the oxalic acid carbon dot nano-enzyme has excellent peroxidase-like activity, a colorimetric and fluorescent dual-mode detection method of glyphosate is constructed through the oxalic acid carbon dot nano-enzyme, dual-mode detection results can be mutually verified, and the detection result is accurate. And the accuracy and the reliability of a detection result are remarkably improved.

The invention discloses a preparation method and application of a sensor array based on luminous carbon dots, and relates to the technical field of sensors, the preparation method comprises the following steps: preparing a carbon source which comprises a precursor containing a targeting functional group or a biomolecule derived carbon source, preparing the luminous carbon dots through a chemical synthesis or physical method, modifying the surfaces of the carbon dots, and preparing the sensor array based on the luminous carbon dots. A core-shell structure is added on the surface of a carbon dot by using an in-situ growth method or a layer-by-layer self-assembly method, the carbon dot with the added core-shell structure is fixed on a substrate of a sensor array, and a performance test is carried out. By synthesizing the carbon dots with a targeted recognition function, the selectivity and the sensitivity of the sensor to a target substance can be remarkably improved, and in the synthesis process, the carbon dots can generate specific interaction with the target substance by adjusting factors such as the structure, the shape, the size and the surface chemical property of the carbon dots; therefore, accurate identification of the target substance is realized, and detection of the marker is realized.

The invention relates to the field of environmental engineering and waste recycling, in particular to a method for detecting and recycling copper ions through carbon dots, amines and acids are used as precursors, the carbon dots with fluorescence are prepared through a microwave-assisted thermal method, the prepared carbon dots are used for quantitative fluorescence sensing and flocculation recycling of II-valent copper ions, and the method for detecting and recycling the copper ions through the carbon dots is suitable for industrial production. The higher the concentration of the II-valent copper ions is, the lower the fluorescence intensity is, a standard linear relation exists between the two, in addition, the obtained carbon dots can also be combined with the II-valent copper ions to form a complex to generate flocculation and calcination to obtain copper oxide, and the II-valent copper ions in the waste are recycled; the preparation method of the carbon dots is simple and efficient, large-scale batch preparation can be achieved, the carbon dots can achieve accurate detection of the II-valent copper ions, the detection limit is extremely low, accurate separation and extraction of the II-valent copper ions can be achieved, the recovery efficiency is high, the cost is low, and practicability is high.

The invention discloses a method for regulating and controlling multicolor luminescence of carbon dots through chemical oxidation, the prepared multicolor carbon dots and application of the multicolor carbon dots, and belongs to the technical field of nanometers.The method comprises the steps that hydrophobic fluorescent carbon dots prepared from melamine and dithiosalicylic acid and an oxidizing agent are dispersed in an organic solvent, and a pre-reaction solution is obtained; transferring the pre-reaction liquid into a container, stirring until the pre-reaction liquid is uniformly dispersed, condensing and refluxing at 40-100 DEG C for 10 minutes to 10 hours, and naturally cooling to room temperature to obtain a product; further centrifuging the product, collecting the precipitate, cleaning, centrifuging and drying to obtain the multicolor carbon dots; the method is simple in process and convenient to operate, does not need expensive preparation instruments, is mild in reaction condition, does not need the action of a catalyst, and realizes preparation of the multicolor luminescent carbon dots by regulating and controlling the surface oxidation degree of the hydrophobic fluorescent carbon dots.

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 belongs to the technical field of carbon material luminescent materials, and particularly relates to a preparation method of a multicolor luminescent carbon dot and bioimaging application of the multicolor luminescent carbon dot. The invention provides a simple and controllable multicolor luminescent carbon dot and a preparation method thereof. By adjusting the reaction time in the heat treatment process of o-phenylenediamine and thiourea solvents, various luminescent carbon dots, including green light, yellow light and red light carbon dots, are successfully separated. The carbon dot provided by the invention can realize controllable adjustment of fluorescence performance by regulating and controlling the conjugation degree of the carbon core and the content of graphite nitrogen. According to the method, the fluorescence mechanism in the carbon dot forming process is understood more deeply, and guidance is provided for designing the structure and optical performance of the carbon dots and achieving controllable synthesis of the high-performance carbon dots. The multicolor luminescent carbon dot provided by the invention has excellent optical performance, stable morphological structure and low cytotoxicity, and has a good application prospect in biological imaging.