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1445 results about "Carbon dot" patented technology
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Preparation method of carbon dot having high fluorescent quantum yield
The invention belongs to the technical field of preparation of a carbon nano material, and particularly relates to a method for preparing a carbon dot having a high fluorescent quantum yield from citric acid and different nitrogen-containing molecules. The method comprises the following steps: weighing 1-10 mmol of solid citric acid, and dissolving in 10 ml of deionized water; weighing 1-10 mmol of ethylenediamine, ethylamine, propylamine, butanediamine, n-hexylamine, p-phenylene diamine or urea, adding into the citric acid solution, and uniformly stirring; transferring the solution into a hydrothermal or high-pressure microwave reaction kettle, reacting under hydrothermal or microwave conditions, and naturally cooling the reaction kettle to room temperature, thus obtaining a yellow or brown carbon dot water solution; and finally, purifying the carbon dot water solution, evaporating, and drying to obtain pure carbon dot solid powder. The carbon dot solution can send out bright blue fluorescence under the irradiation of a handheld ultraviolet lamp. The invention has wide application prospects in the fields of biological imaging, fluorescent printing and the like.
Owner:JILIN UNIV
Nitrogen, phosphorus and sulphur doping or co-doping carbon dot and batch controllable preparing method and application thereof
InactiveCN104987863ASimple processShort synthesis timeNanoopticsFluorescence/phosphorescenceAir atmosphereSilica gel
The invention provides a nitrogen, phosphorus and sulphur doping or co-doping carbon dot and a batch controllable preparing method and application thereof. The method comprises the steps that a carbon source, a nitrogen source, a phosphorus source and a sulphur source are evenly mixed, and a mixture is obtained, wherein the molar ratio of C to N to P to S in the mixture is 1 to 0-0.8 to 0-0.4 to 0-0.4, and the contents of N, P and S are prevented from being zero at the same time; in the air, the mixture is heated to be fused, the reaction is carried out for 3 min to 60 min, natural cooling is carried out till the indoor temperature is reached, a reaction product is separated by a silicagel column, raw materials which do not react are removed, and the nitrogen, phosphorus and sulphur doping or co-doping carbon dot is obtained. According to the method, the technology is simple, the compound time is short, batch producing can be achieved, the doping amount can be adjusted and controlled accurately, the fluorescence color of the prepared carbon dot ranges from blue to green, the application can be achieved on bioluminescence marking and cell imaging aspects, and the good economic benefit and the application prospect are achieved.
Owner:XI AN JIAOTONG UNIV
Water soluble fluorescent quantum carbon dots
The present invention relates to the water soluble self fluorescent quantum carbon dots (C-dots). These C-dots are isolated from carbon soot in one embodiment a wax soot solvent washed and isolated from other larger material by filtration such as by membrane filtration. The C-dots can be varied in their color by change of their size and by the amount of oxidative groups' position on each C-dot.
Owner:SINON NANO SCI INC
Method for preparing water-soluble fluorescent carbon dots
The invention relates to a method for preparing water-soluble fluorescent carbon dots. The method comprises the following steps: by adopting a citric acid as a carbon source, urea as a passivator and a dopant and deionized water as solvents aiming at the conditions that the fluorescent carbon dots are high in accuracy and difficult to synthesize, preparing a carbon dot water solution by adopting a hydrothermal synthesis method; and preparing the carbon dots by the following processes of preparing the solution, air-tight reaction, filtering, dialyzing, freezing and drying, and grinding. The technology is advanced in process, rapid and efficient, accurate and specific in data, and good in product shape; the product is green powder particles; and the diameters of the particles are smaller than or equal to 5.5nm; the product is high in purity which can be up to 99%, and good in water-solubility which can be up to 99.5%. The method is an ideal method for preparing the fluorescent carbon dots. The product can be applied to the fields such as ion detection, bioimaging, photoelectric devices and composite materials.
Owner:TAIYUAN UNIV OF TECH
Probe System Comprising an Electric-Field-Aligned Probe Tip and Method for Fabricating the Same
A mechanically stable and oriented scanning probe tip comprising a carbon nanotube having a base with gradually decreasing diameter, with a sharp tip at the probe tip. Such a tip or an array of tips is produced by depositing a catalyst metal film on a substrate (10 & 12 in FIG. 1(a)), depositing a carbon dot (14 in FIG. 1(b)) on the catalyst metal film, etching away the catalyst metal film (FIG. 1(c)) not masked by the carbon dot, removing the carbon dot from the catalyst metal film to expose the catalyst metal film (FIG. 1(d)), and growing a carbon nanotube probe tip on the catalyst film (16 in FIG. 1(e)). The carbon probe tips can be straight, angled, or sharply bent and have various technical applications.
Owner:RGT UNIV OF CALIFORNIA
Dual emission rate type fluorescent probe for visually detecting carbon dots-Au nanoclusters of mercury ions and preparation method
InactiveCN105067577AFluorescence/phosphorescenceLuminescent compositionsComposite nanoparticlesQuenching
The invention relates to a dual emission rate type fluorescent probe for visually detecting carbon dots-Au nanoclusters of mercury ions and a preparation method. Dual-emission composite silicon dioxide nanoparticles are composite silicon dioxide nanoparticles formed by utilizing carbon dot covered silicon dioxide particles as cores and covalently coupling the surfaces of the carbon dot covered silicon dioxide particles with the Au nanoclusters after surface amination. The carbon dots located in the silicon dioxide nanoparticle cores are taken as reference fluorescence signals, the Au nanoclusters on the outer layers are taken as response fluorescence signals, and the signals are used for Hg<2+> selective recognition. The Au nanoclusters as the response fluorescence signals are connected to the surface of a silicon layer through covalent bond connection, and one stable nano-fluorescent probe is formed. When the dual-fluorescence composite nanoparticles are taken as the rate type fluorescent probes, the intensity of the carbon dot fluorescence signals in the cores basically keep unchanged, and the Au nanoclusters on the outer layers can be bonded with Hg<2+> selectively so as to result in fluorescence quenching of the Au nanoclusters on the outer layers.
Owner:TIANJIN UNIV
Carbon dots with high fluorescent quantum yield, and application thereof in fluorescent color development
InactiveCN103395771AHigh fluorescence quantum yieldMaterial nanotechnologyNano-carbonEthylenediamineQuantum yield
The invention relates to carbon dots with high fluorescent quantum yield, and an application thereof in fluorescent color development, and belongs to the application field of fluorescent carbon nanomaterials. Specifically, the invention relates to the carbon dots with the high fluorescent quantum yield which are synthesized by using citric acid and ethene diamine as raw materials as a fluorescent ink for writing or fluorescent printing, and further broadens the application thereof in fluorescent electrospining, fluorescent micro arrays and fluorescent composites. The carbon dots with the high fluorescent quantum yield are obtained by blending 1-100 mmol of citric acid and 1-100 mmol of ethene diamine in 5-100 mL of deionized water and transferring the mixture into a reaction kettle; carrying out a hydrothermal reaction for 2-10 hours at a temperature of 100-500 DEG C; cooling the reaction kettle to a room temperature after the reaction is finished to obtain a water solution of the carbon dots with the high fluorescent quantum yield; pouring the water solution of the carbon dots in a dialysis bag with a molecular weight of 3,500; dialyzing for 48-60 h; spin drying a dialysis outer solution and vacuum drying.
Owner:JILIN UNIV
Mesoporous silica/carbon dot nanometer composite and preparation method thereof
InactiveCN104877677AAvoid cloggingSimple preparation processLuminescent compositionsMesoporous silicaSilicon dioxide
The invention discloses a mesoporous silica / carbon dot nanometer composite and a preparation method thereof. The preparation method of the mesoporous silica / carbon dot nanometer composite includes steps of synthesizing hexagonal ordered mesoporous silica SBA-15 (nearly 8 nm in bore diameter) by triblock copolymer P123; steeping the mesoporous SBA-15 silica in a certain concentration of citric acid solution for adsorption, and filling citric acid molecules into holes of mesoporous SBA-15; roasting the SBA-15 filled with citric acid in a chamber resistance furnace to obtain mesoporous silica / carbon dot nanometer composite. The carbon dots are uniformly loaded in the holes of the mesoporous SBA-15, and the multifunctional nanometer composite with ordered mesoporous structure and fluorescent function is prepared. The mesoporous silica / carbon dot nanometer composite has the advantages of simplicity in preparation technique, moderate reaction conditions and environment friendliness.
Owner:ZHOUKOU NORMAL UNIV
Transition metal-doped carbon fluorescent quantum dot preparation method
The present invention relates to a transition metal-doped carbon fluorescent quantum dot preparation method, which comprises: dissolving a metal chelating agent and a transition metal salt in an organic solvent, carrying out a solvothermal reaction, and carrying out concentration purification after the reaction to prepare the transition metal-doped carbon fluorescent quantum dots having good water solubility. According to the present invention, the operation of the method is simple, the metal ion doping on the carbon fluorescent quantum dots can be achieved without harsh reaction conditions or large instruments, such that the characteristic that the long wavelength fluorescence emission is not easily achieved by the general carbon dots can be achieved; the obtained carbon fluorescent quantum dots have characteristics of good water solubility, wide fluorescence emission range, and maximum emission wavelength change along with concretion change; and with the characteristics of the preparation method, the prepared transition metal-doped carbon fluorescent quantum dots provide great application values in the fields of biological labeling sensing and medical imaging, photoelectricity, light-emitting device preparation, and the like.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Synthesis method of nitrogen-doped fluorescent carbon dots
InactiveCN104528692AHigh yieldSimple processMaterial nanotechnologyLuminescent compositionsQuantum yieldArginine
The invention belongs to the field of nano light-emitting materials, and relates to a synthesis method of nitrogen-doped fluorescent carbon dots. The nitrogen-doped fluorescent carbon dots are synthesized by a hydrothermal synthesis process by one step by using L-arginine as a carbon source and nitrogen source and citric acid as an assistant. The method comprises the following steps: dissolving L-arginine in deionized water, regulating the pH value of the solution with citric acid, putting the mixed solution in a polytetrafluoroethylene hydrothermal reaction kettle, heating to react to obtain a brown yellow fluorescent carbon dot solution, and finally, dialyzing the fluorescent carbon dot solution in a dialysis bag to remove unreacted raw materials, thereby obtaining the fluorescent carbon dot solution with narrow particle size distribution. The synthesis method is simple to operate, does not need to add any strong acid, strong alkali or any other catalyst, and has the advantages of low raw material cost, no radiation action, environment friendliness and the like; and the obtained fluorescent carbon dots have the advantages of high fluorescent quantum yield and no cytotoxicity, and are successfully applied to cell fluorescence labeling.
Owner:CHINA PHARM UNIV
Method for preparing luminescent carbon dots from carbohydrate
InactiveCN103832993AHigh luminous intensityHigh quantum yieldMaterial nanotechnologyCarbon preparation/purificationQuantum yieldBiological imaging
The invention relates to a method for preparing luminescent carbon dots from carbohydrate. The carbohydrate based carbon dots prepared by the invention can be used for biological imaging and analysis to determine the content of metal ions. The method for preparing luminescent carbon dots from carbohydrate provided by the invention is as below: mixing carbohydrates with a modifier with amino at different molar ratios; reacting for a certain time by a hydrothermal method; filtering; regulating the pH to a neutral state, conducting dialysis and purification to remove excessive salt, so as to obtain the carbohydrate based luminescent carbon dots. The method for preparing the luminescent carbon dots provided by the invention uses carbohydrates as raw materials, which are easily available and have low cost; the obtained carbon dots have high quantum yield; and the equipment for the preparation process is simple,the method can be completed in general chemistry laboratory, and is easy for popularization.
Owner:TIANJIN POLYTECHNIC UNIV
Method for preparing carbon dots with hydrothermal process on basis of plant leaves
InactiveCN104261386ARaw materials are safe and easy to obtainLow costLuminescent compositionsCentrifugationDialysis
The invention discloses a method for preparing carbon dots with a hydrothermal process on the basis of plant leaves. The plant leaves are transferred into a reaction kettle, ultrapure water is added, and the mixture is uniformly mixed and subjected to hydrothermal treatment at the temperature of 130 DEG C-250 DEG C for 2-15 hours; the mixture is cooled and filtered to obtain a brown yellow liquid, the brown yellow liquid is subjected to dialysis for 15-48 hours by a dialysis bag with interception of 3,500, and dialysate is collected; or high-speed centrifugation is performed, and fluorescent carbon dots are obtained. The method is simple and safe to operate, environment-friendly raw materials are used, chemical reagents and surface passivation are not required for assisting synthesis, and the method can be applied to the fields of fluorescence labeling, analysis, sensing, catalyzing and the like.
Owner:ä¸å›½äººæ°‘解放军防化å¦é™¢
Preparation method and product of full-color carbon dots for multi-color fluorescent printing
ActiveCN108587615AEmission wavelength red shiftImprove stabilityInksNanoopticsSolubilityColor printing
Owner:JIANGNAN UNIV
Method for green synthesis of fluorescent chiral carbon dots
InactiveCN103693633AHigh fluorescence quantum yieldHigh yieldNanoopticsNano-carbonQuantum yieldParticle-size distribution
The invention provides a method for green synthesis of fluorescent chiral carbon dots. The method comprises the steps of 1, ultrasonically dispersing a carbon precursor and amino acid in deionized water to prepare a transparent aqueous solution or latex, wherein the mass ratio of the carbon precursor to the amino acid is 200:1 to 5:1; 2, putting the mixed solution obtained in the step 1 into a microwave heating device for a microwave heating reaction so as to obtain yellow or brown-yellow liquid; 3, dialyzing the carbon quantum dot solution obtained through the reaction in the step 2 by a dialysis bag of which the molecular weight cut-off is 1,000-50,000 to remove unreacted carbon precursor and amino acid, thereby obtaining fluorescent carbon dots, of which the particle size distribution is narrow, without further purification. The method disclosed by the invention adopts a microwave synthetic method to obtain the chiral carbon dots with the relatively high fluorescent quantum yield through one step, the synthetic method is simple, the required equipment is simple, the repeatability is good, and the method is suitable for preparation of chiral carbon dots on a large scale.
Owner:SHANGHAI JIAO TONG UNIV
Nitrogen-doped fluorescent carbon-dot and carbon-dot graphene composite as well as production method and application thereof
InactiveCN104028291AHigh catalytic activityLarge steady state currentPhysical/chemical process catalystsElectrolysis componentsBiological imagingCoal
The invention relates to the field of a carbon nano material, and provides a nitrogen-doped fluorescent carbon-dot and a carbon-dot graphene composite as well as a production method and an application thereof. The nitrogen-doped fluorescent carbon dot is characterized in that the nitrogen element exists in the form of pyridine nitrogen, pyrrole nitrogen and graphitic nitrogen; the nitrogen atom and carbon atom are in a molar ratio of 0.035 to 0.057; the average granularity is 2.5nm to 4.1nm. The invention also provides a preparation method of a fluorescent carbon dot. The preparation method comprises the following steps: (1) carbonizing coal with high content of nitrogen to obtain a carbonized material, wherein the coal with high nitrogen content refers to the coal with the nitrogen content of 1.1 to 3.0 percent; (2) producing an anode through the obtained carbonized material, and electrochemically oxidizing the anode to obtain the fluorescent carbon dot. The invention also provides a carbon-dot-graphene composite material prepared through the nitrogen-doped fluorescent carbon dot. In addition, the invention also provides an application of the fluorescent carbon dot in the fields such as photoelectric devices, biological imaging, oxidation-reduction electric catalyst, detection and sensing and an application of an oxidation-reduction electrochemical catalyst in the field of a fuel battery.
Owner:DALIAN UNIV OF TECH
Method for synthesizing fluorescence carbon dots with adjustable wave length in quantity and carbon quantum dots prepared through method
InactiveCN106995699ASignificantly progressiveThe synthesis method is simpleLuminescent compositionsPurification methodsMaterials science
The invention discloses a method for synthesizing fluorescence carbon dots with adjustable wave length in quantity and the carbon quantum dots prepared through the method, and relates to a preparation method of the carbon dots with higher synthesis fluorescence efficiency and mass yield and adjustable emission wavelength in a whole visible region by utilizing the same precursor as a carbon source. According to the preparation method for heat-treating the same carbon source by adopting different solvents and a fast precipitation purification method, the process is simple, high-efficient, green and environment-friendly, raw materials are cheap, and the reaction temperature is 160 to 250 DEG C. Each synthesized carbon quantum dot is formed by compounding a graphitized crystal lattice core and a layer of amorphous carbon shell, and has better solubility, stability and higher luminous efficiency in a common solvent; the diameter is gradually increased along with emission wavelength red shift and is 2 to 12nm. The synthesized carbon quantum dot as a novel luminescent material has the advantages of low production cost, high preparation yield, good light emitting stability low biotoxicity and favorable application prospect in application of photoelectric devices. The preparation method of the high-efficient near infrared fluorescence carbon dots brings convenience and chance for biological application of the carbon dots.
Owner:CHINA UNIV OF MINING & TECH
Preparation method and application of carbon dot photonic crystal having opal structure or inverse opal structure
ActiveCN105525343AEasy to operateLow costPolycrystalline material growthLiquid-phase epitaxial-layer growthPhotonic bandgapMicrosphere
The invention discloses a preparation method and application of a carbon dot photonic crystal having an opal structure or an inverse opal structure and having photonic band gap modulation of optical limiting and anti-fake performance. According to the method, with polystyrene microspheres as a raw material, a photonic crystal template is assembled by a vertical deposition method, then the carbon dot photonic crystal having the inverse opal structure is prepared by a sacrificial template method; or a carbon dot solution is added in the process of synthesis of silica microspheres, silica microspheres containing carbon dots and having different particle sizes are prepared, and then the carbon dot photonic crystal having the opal structure is assembled by a vertical deposition method. The obtained carbon dot photonic crystal has good optical limiting modulation behavior on laser according to difference of band gaps. At the same time, the prepared carbon dot photonic crystal is patterned by using a photoetching template, and can be used in anti-fake patterns with combination of the characteristic that the carbon dot photonic crystal emits fluorescence with different colors under different excitation light. The method has the advantages of simple operation and low cost, and is suitable for large-scale preparation of the carbon dot photonic crystal having special functions.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
A method for quantitative detection of biological molecules capable of being metabolized to generate H2O2 in serum by means of a ratiometric fluorescent probe
ActiveCN107478621AExcellent fluorescence performanceHighly sensitive assayFluorescence/phosphorescenceLinear relationshipHigh selectivity
The invention discloses a method for quantitative detection of biological molecules capable of being metabolized to generate H2O2 in serum by means of a ratiometric fluorescent probe. The method includes firstly preparing copper-nitrogen codoped carbon dots Cu-CDs; then reacting corresponding oxidase and the biological molecules capable of being metabolized to generate H2O2 to generate H2O2; catalyzing the H2O2 and a substrate that is o-phenylenediamine with horseradish peroxidase to generate an oxidation product DAP having yellow fluorescence; then adding the Cu-CDs into the DAP; allowing the DAP and the Cu-CDs to form ratiometric fluorescence, with the ratio I<572> / I<460> of fluorescence intensities of the DAP and the Cu-CDs being in a linear relationship with the concentration of a substance to be detected; and performing quantitative assay of the biological molecules in the serum according to the ratio of fluorescence intensities. The method is high in sensitivity and simple and convenient in detection, and has high selectivity and high affinity of immunoreactions.
Owner:NANJING MEDICAL UNIV
Method for preparing fluorescence color adjustable carbon dots
ActiveCN109294569AWide range of choicesImprove quantum efficiencyNanoopticsFluorescence/phosphorescenceQuantum efficiencyRed fluorescence
The invention relates to a method for preparing fluorescence color adjustable carbon dots. According to the method, a diphenol compound is used as a carbon source, and under the action of an oxidizingagent, a carbon dot mixed liquor is generated by a solvothermal one-pot reaction; and then, the carbon dot mixed liquor is purified by column chromatography to obtain the carbon dots emitting variousfluorescence colors. By regulating the combination of the diphenol compound and the oxidizing agent, the fluorescence colors of the carbon dots are adjusted. By the method, long-wavelength luminescence of the carbon dots can be realized, and quantum efficiency is improved. Quantum efficiency of the carbon dots having blue fluorescence color is 66%, quantum efficiency of the carbon dots having green fluorescence color is 81%, quantum efficiency of the carbon dots having yellow fluorescence color is 36%, and quantum efficiency of the carbon dots having red fluorescence color is 7%.
Owner:HENAN UNIVERSITY
Probe system comprising an electric-field-aligned probe tip and method for fabricating the same
InactiveUS20100229265A1Improve spatial resolutionMaterial nanotechnologyNanoinformaticsCarbon nanotubeMetal
A mechanically stable and oriented scanning probe tip comprising a carbon nanotube having a base with a gradually decreasing diameter, with a sharp tip at the probe tip. Such a tip or an array of tips is produced by depositing a catalyst metal film on a substrate, depositing a carbon dot on the catalyst metal film, etching away the catalyst metal film not masked by the carbon dot, removing the carbon dot from the catalyst metal film to expose the catalyst metal film and growing a carbon nanotube probe tip on the catalyst metal film. The carbon probe tips can be straight, angled, or sharply bent and have various technical applications.
Owner:JIN SUNGHO +2
Preparation method of double-emission carbon-based nano probe and product of preparation method
ActiveCN108913132AEasy to prepareLow costNanoopticsThermometers using physical/chemical changesBiological imagingColor changes
The invention discloses a preparation method of a double-emission carbon-based nano probe prepared based on an electrostatic interaction induced self-assembling method and application of a product ofthe preparation method to in-vivo and in-vitro temperature detection of organisms, and belongs to the technical field of colorimetric fluorescence detection. The preparation method comprises synthesisof blue fluorescence carbon dots (B-CDs) which have no temperature sensitivity and negative charges on surfaces, preparation of red fluorescence carbon dots (R-CDs) which have temperature sensitivityand positive charges on surfaces and preparation of the double-emission carbon-based nano probe. According to the double-emission carbon-based nano probe obtained by the preparation method, the double-emission carbon-based nano probe has different responsiveness aiming at different temperature and has different compound temperature color changes; the double-fluorescence emission nano probe can beused for colorimetrically detecting in-vivo and in-vitro temperature of the organisms by naked eyes, and has high sensitivity (0.93 percent / DEG C) and operation repeatability, so that the double-fluorescence emission nano probe provides convenience for biological imaging, temperature sensing, environment monitoring, food safety and the like.
Owner:JIANGNAN UNIV
Method of one-step synthesizing fluorescent carbon dots with corncob as carbon source
InactiveCN105038781AReduce usageRaw materials are cheap and easy to getLuminescent compositionsMicrowave methodUltrasound method
The invention discloses a method of one-step synthesizing fluorescent carbon dots with corncobs as a carbon source and belongs to the technical field of synthesis of fluorescent carbon dots. In the technical scheme, the method of one-step synthesizing the fluorescent carbon dots with the corncobs as the carbon source includes the following steps: mixing pre-treated corncobs, ethanediamine and deionized water uniformly, and performing heating reaction to prepare the fluorescent carbon dots through hydrothermal method, microwave method and ultrasound method; or directly calcining the pre-treated corncobs to obtain the fluorescent carbon dots. The raw materials are easy to obtain. The method is simple in processes, is mild in reaction conditions, is simple in operation and is free of toxic reagents. The fluorescent carbon dots can not only be used as a fluorescent probe to detect substance content but also be used in the researching fields of bio-markers, bio-imaging, photo-catalysis, photo-electronic devices, bio-sensors and the like.
Owner:HENAN NORMAL UNIV
Yellow fluorescence carbon dots with high quantum yield and preparation method thereof
ActiveCN105542764AHigh quantum yieldHas solid light emitting propertiesNanoopticsLuminescent compositionsSolubilityQuantum yield
The invention relates to yellow fluorescence carbon dots with high quantum yield. A preparation method of the yellow fluorescence carbon dots is characterized by comprising the following steps: dissolving organic acid and organic amine in water; performing microwave radiation after fully mixing the organic acid and the organic amine, thus obtaining a brown solid crude product; performing reverse-phase silica gel column chromatography purification by taking a mixed solution of the water and methyl alcohol as an eluting agent, thus obtaining the yellow fluorescence carbon dots. The yellow fluorescence carbon dots are characterized in that the average grain diameter is 3.0 to 4.0 nm; bright yellow fluorescent light can be emitted under the irradiation of an ultraviolet lamp, the excitation wavelength is 400 to 420 nm, the emission wavelength is 510 to 550 nm, the luminescent property of solids is shown, and the quantum yield can reach 44 percent. The yellow fluorescence carbon dots prepared by the invention are good in water solubility and stable in fluorescence signals, are suitable for cell imaging under physiological conditions, have a function of nuclear staining and can be widely applied to the fields of analysis and detection, biochemical sensing, biological imaging, biological marking and the like.
Owner:LANZHOU UNIVERSITY
Preparation method and application of molecular imprinting electroluminescent sensor for detecting trace veterinary drug residue by taking battery as power
InactiveCN103115914ALow costIncreased sensitivityAnalysis by electrical excitationElectrical batterySchematic maps
The invention discloses a molecular imprinting electroluminescent sensor for detecting veterinary drug residue by taking a battery as power and a method for detecting veterinary drug residue. A preparation method of an electrode (a schematic diagram is shown in the figure) comprises the following steps of: preparing MIP (Molecularly Imprinted Polymer)s sol of the veterinary drug residue; preparing a carbon dot and preparing a graphene nano material according to documents; and modifying graphene, the carbon dot and the MIPs sol onto the surface of the electrode of the sensor. The method for detecting the trace veterinary drug residue comprises the following steps of: connecting the modified electrode to an electrogenerated chemiluminescence instrument, and detecting the veterinary drug residue in a sample extract by taking the battery as the power. The molecular imprinting electroluminescent sensor disclosed by the invention has the advantages that the specificity of the electrode is strong and the sensitivity is high and can be up to a ng grade; only 3-5 minutes are spent on a basic detection process; and the cost is low. The method for detecting the veterinary drug residue by adopting the electrode is quick and easy to operate, the reaction is automatically completed by instruments and results are automatically recorded by the instruments.
Owner:UNIV OF JINAN
Ratio-type fluorescent probe based on carbon dot as well as preparation method and application thereof
InactiveCN104694117AGood choiceHigh sensitivityFluorescence/phosphorescenceLuminescent compositionsRare earthEuropium
The invention discloses a ratio-type fluorescent probe based on a carbon dot and a europium complex, a preparation method of the ratio-type fluorescent probe and an application method of the ratio-type fluorescent probe in a water sample detection technology. A hyperfluorescence rare earth complex and the carbon dot are taken as a double luminous center, a covalent binding manner is adopted for bonding two luminophors together, and ratio-type detection on Cu<2+> ions in a water sample is carried out by virtue of strength ratio of the hyperfluorescence rare earth complex to the carbon dot. The ratio-type fluorescent probe has good selectivity and sensitivity.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Method of detecting adenosine with fluorescent sensor on the basis of aptamer
InactiveCN106950206AEffective quenchingHigh absorption coefficientFluorescence/phosphorescenceEnergy transferAnalysis data
The invention discloses a method of detecting adenosine with a fluorescent sensor on the basis of an aptamer. In the method, gold nano particles modified with the aptamer are used as a recognition probe and an energy acceptor, and carbon dots modified with an aptamer complementary chain are used as a fluorescent probe and an energy donor; through a hybridization reaction, fluorescence resonance energy transfer is carried out between the gold nano particles and the carbon dots, and fluorescence of the detection system is quenched. After addition of adenosine, the adenosine and the aptamer complementary chain are competitively combined with the aptamer, so that energy transfer efficiency between the gold nano particles and the carbon dots is weakened; and the fluorescence of the detection system is recovered, so that based on the change of the fluorescence signal, the method achieves quantitative detection of the adenosine. The method has strong specificity and simple operation, is low in required quantity of a sample, is high in sensitivity, can be used for detecting the adenosine in a blood sample and supplies useful analysis data for clinical diagnosis on diseases.
Owner:NANJING MEDICAL UNIV
Fluorescent carbon dot/mesoporous molecular sieve composite luminescent material as well as preparation and application of fluorescent carbon dot/mesoporous molecular sieve composite luminescent material
InactiveCN105754594AEasy to prepareShort timeFluorescence/phosphorescenceLuminescent compositionsSilanesSolvent
The invention belongs to the field of composite luminescent materials and discloses a fluorescent carbon dot / mesoporous molecular sieve composite luminescent material, a preparation method of the composite luminescent material and application of the composite luminescent material in the aspect of oxygen sensing. The preparation method of the composite luminescent material comprises the following steps: (1) preparing silane functionalized fluorescent carbon dots: under a stirring condition, adding anhydrous citric acid into a silane coupling agent and reacting at a constant temperature; purifying to obtain silane functionalized fluorescent quantum dots; (2) preparing the fluorescent carbon dot / mesoporous molecular sieve composite luminescent material: under the condition of taking ethanol as a solvent, taking a mesoporous molecular sieve to react with the silane functionalized fluorescent carbon dots prepared in the step (1) and purifying to obtain the fluorescent carbon dot / mesoporous molecular sieve composite luminescent material. The preparation method is simple, and the raw materials are low in price and have no toxin; the prepared composite luminescent material has high sensitivity and selectivity, stable performance, and quick response, the emission intensity is sensitive to oxygen concentration, and the composite luminescent material is an economical type green and environment-friendly oxygen sensing material.
Owner:SOUTH CHINA AGRI UNIV
Red-light carbon dot of high yield and high quantum yield, and preparation method thereof
The invention discloses a red-light carbon dot of high yield and high quantum yield, and a preparation method thereof. The preparation method is used for the large-scale synthesis of carbon dots, wherein the carbon dots are emitted within the red-light area (with the peak value thereof between 610-661 nm) and the quantum yield is 76% which is highest at present. The particle sizes of carbon nano particles are within 2-8 nm, and the carbon nano particles are mainly composed of a graphitized carbon core and an amorphous functional group shell. Meanwhile, the carbon nano particles are good in luminous efficiency, solubility and stability in common solvents. As a novel type of red fluorescent materials, the red-light carbon dot has the advantages of low production cost, large-scale preparation, extremely high luminous efficiency, good stability and other excellent properties. The red-light carbon dot is a most promising material for replacing conventional semiconductor quantum dots and serves as a low-toxicity nano new material in the fields of optoelectronic devices, fluorescent sensing and biological technology.
Owner:CHINA UNIV OF MINING & TECH
High-quantum-yield eigenstate-fluorescence-adjustable carbon dot and preparing method and application thereof
ActiveCN106566538AHigh quantum yieldHigh yieldLuminescent compositionsSemiconductor devicesQuantum yieldSolvent
The invention relates to the field of fluorescence carbon nanomaterials, in particular to a high-quantum-yield eigenstate-fluorescence-adjustable carbon dot and a preparing method and application thereof. Diaminonaphthalene or a hydroxyl, carboxyl, methyl, ethyl, N,N-dimethyl and N,N-diethyl substituted ramification of the diaminonaphthalene and citric acid serve as carbon source precursors, an eigenstate fluorescence carbon dot solution can be obtained through a solvothermal method. The prepared eigenstate fluorescence carbon dot has the beneficial effects of being high in crystallization, high in surface passivation degree, even in nitrogen doping, even in size distribution and the like, and has the wide application prospect.
Owner:BEIJING NORMAL UNIVERSITY
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