58 results about "Hydrogen telluride" patented technology

The invention provides a preparation method for a quantum dot fluorescent imprinted polymer and belongs to the technical field of preparation of environment-friendly materials. The preparation method comprises the following steps: firstly, synthesizing a precursor sodium hydrogen telluride in a needle pipe; synthesizing a water-soluble CdTe quantum dot by using thiomalic acid as a protection agent; finally, synthesizing the quantum dot fluorescent imprinted polymer which takes cyhalothrin as a template molecule by using a reverse micro-emulsion method so as to optically detect the cyhalothrin. The prepared quantum dot fluorescent imprinted polymer has high optical stability and pH (Potential of Hydrogen) stability and has the capability of selectively identifying the cyhalothrin.

The invention relates to a method for rapidly preparing a water-soluble quantum dot by an ultrasonic spraying method with continuous production, which comprises the following steps that: cadmium ions or zinc ions and hydrogen (or selenide) telluride or sodium hydrogen telluride (or selenide) react to obtain a precursor solution of cadmium (zinc) telluride (selenide) through the complexation of a mercapto compound. An ultrasonic atomizer is used to atomize the precursor solution to form fogdrops of the precursor solution, and the fogdrops flow through a device with constant temperature to react to obtain the water-soluble quantum dot. The method has the advantages of high speed and continuous quantum dot production, the prepared quantum dot has high fluorescence quantum yield (between 20 and 50 percent), and good monochromaticity of luminescence (the peak width at half height of a fluorescence spectrum within the range of visible light is between 30 and 40nm), and the size of nano-particles can be easily controlled by changing the temperature and flow rate, thereby realizing the adjustment to luminescence peak positions (between 400 and 700nm).

The present invention relates to a method for preparing CeTe / ZnSe core-shell quantum point with water solubility and high fluorescence yield. Said method uses water as solvent, and adopts the following steps: mixing cadmium salt or cadmium oxide and water-soluble mercaptocompound, injection sodium hydrogen telluride or potassium hydrogen telluride produced by adopting sodium borohydride or potassium borohydride and selenium powder and making them be reacted to obtain cadmium telluride precursor solution, then heating said solution in water bath under the protection of nitrogen gas to synthesize cadmium telluride fluorescence quantum point, then making purification and injecting ZnSe monomer, water bath heating and synthesizing CdTe / ZnSe core-shell type quantum point.

This invention relates to a silicon shell style CdTe quanta point preparation method. The solution is methanol or tetrahydrofuran, cadmium salt and 3-thinness group propyl lumiflavin oxygen group silane are mixed to prepare hydrogen telluride gas under condition of nitrogen gas, then they are heated and back flow and oxy hydrogen four kalium amine is used to adjust solution pH value to alkalescence and go on back flow, so the CdTe quanta point wrapped by silicon shell is directly prepared. The advantage is easy operation, and there is no need of high temperature and other critical conditions, the procedure of MPS and other complex procedures is omitted, the particle disperse capability is good, anti-light bleaching capability is great improved. It has great application prospect in bio-molecular imaging and its tracing, and can be use as a new lighting material, it is widely used in laser, LED, photoreceptor and other research fields.

The invention belongs to the field of preparation of nano materials and relates to a method for preparing CdTe quantum dots in an aqueous phase and at a low temperature. The method comprises the following steps of: preparing solution from dithioamino formate serving as a stabilizing agent, water serving as a solvent, cadmium salt and a ligand according to a certain ratio; injecting sodium hydrogen telluride or potassium hydrogen telluride aqueous solution; and reacting in water bath at the low temperature for a certain time to obtain the water dispersible CdTe quantum dots. The preparation method has the advantages of low reaction temperature, readily available raw materials, convenience of preparation, easiness in operation, low requirement on reaction equipment, low price, energy conservation, environmental friendliness, preparation on a large scale and suitability for industrialization because the CdTe quantum dots are prepared in the aqueous phase completely. The prepared CdTe quantum dots have uniform grain size and high dispersibility, and can serve as solar battery dye sensitive materials or photocatalytic materials.

The invention discloses a method for preparing a CdTe quantum dot marked catalase fluorescent probe, which comprises the following steps: A) preparing a potassium hydrogen telluride solution by reducing the tellurium powder with potassium borohydride; B) weighting cadmium chloride crystals, and dissolving the cadmium chloride crystals in high purity water and fixing the volume and to obtain a cadmium chloride solution; C) weighting mercaptoacetic acid, diluting the mercaptoacetic acid with high purity water and fixing the volume to obtain a mercaptoacetic acid solution; D) taking anaerobic high purity water, stirring and continuously introducing high-purity nitrogen, respectively adding the cadmium chloride solution and the mercaptoacetic acid solution, adding the sodium hydroxide solution for adjusting the pH value, and then adding the potassium hydrogen telluride solution; E) canning the mixed solution into polytetrafluoroethylene digestion jars, and keeping the mole ratio of cadmium chloride, potassium hydrogen telluride and mercaptoacetic acid; and F) adding CdTe quantum dots into N-hydroxy succinimide and shaking at constant temperature to finally obtain the quantum dot marked catalase fluorescent probe. The method has simple process and the technical parameters are easily controlled. The biocompatibility is excellent. The probe has double detection property and can be used for fluorescent detection and enzymatic activity detection.

The invention relates to a method for preparing high fluorescence-efficiency cadmium telluride quantum dots through cathodic tellurium electrodes. The method is characterized in that: (1) stable tellurium rods are taken as tellurium electrodes; under the electric potential between 0.95 V below zero and 1.2 V below zero (relative to Ag|AgCl|KCl(sat.) electrodes), the cathodic tellurium electrodes are used as a tellurium source to prepare a cadmium telluride precursor solution, so as to replace a sodium hydrogen telluride or hydrogen telluride source easy to oxidize by air, or an aluminum telluride source easy to absorb water; therefore, the preparation of the quantum dots can be carried out in an open system without specific protective atmosphere; (2) the cadmium telluride quantum dots with different modified groups on the surfaces can be prepared by taking a mercapto-compound as a stabilizer; (3) preparation process is completed in an aqueous phase at a temperature between 70 and 100 DEG C, and the water-soluble quantum dots used for biological markers and detection can be prepared; and (4) the particle size and maximum emission wavelength of the cadmium telluride quantum dots can be adjusted by controlling heating time. The cadmium telluride quantum dots synthesized in the invention have the particle size between 2.0 and 5.0 nanometers, the maximum emission wavelength between 500 and 650 nanometers, the emission-spectrum half-peak width between 40 and 55 nanometers, as well as the fluorescence quantum yield from 60 to 78 percent. The method has the characteristics of convenience, rapidness, environment protection, good reproducibility, low cost and the like, provides a feasible way for synthesizing high-quality cadmium telluride quantum dots, and can have wide application prospects in the nanometer devices, optoelectronics, biological sensing and other fields.

The invention discloses a preparation method of a zearalenone ratio fluorescence probe. The method comprises the following steps: (1) preparation of a silicon quantum dot: APTES((3-aminopropyl)-triethoxysilane) and sodium citrate are subjected to a reaction in glycerol, and silicon quantum dots are obtained; (2) preparation of CdTe (cadmium telluride) quantum dots: tellurium powder, sodium borohydride and the like are subjected to a reaction, a NaHTe (sodium hydrogen telluride) precursor is obtained and added to the reaction solution, and red CdTe quantum dots are obtained; (3) preparation ofaptamer grafted silicon quantum dots: the prepared silicon quantum dots, N-(3-dimethylaminopropyl)-N-carbodiimide hydrochloride, N-hydroxysuccinimide, and a zearalenone aptamer are subjected to a reaction in an HEPES buffer solution, and silicon fluorescence quantum dots with surface grafted with the zearalenone aptamer are obtained; (4) synthesis of the ratio fluorescence probe: the red CdTe quantum dots are mixed with the silicon fluorescence quantum dots with surface grafted with the zearalenone aptamer, and the fluorescence probe is obtained. The fluorescence probe is high in selectivity and sensitivity, simple to prepare and low in cost.

The invention relates to an aqueous phase synthesis process of water-soluble CdZnTe ternary quantum dots in the nano technology field. The invention chooses oxide of cadmium salt or cadmium as cadmium source, oxide of zinc salt or zinc as zinc source and sodium hydrogen telluride formed by tellurium powder and sodium borohydride, uses sulfhydryl group compound as stabilizer, and prepares the mixing solution of Cd, Zn precursor solution under the protection of nitrogen, and obtains water-soluble CdZnTe ternary quantum dots through reacting after adding sodium hydrogen telluride under the condition of heating reflux. The sulfhydryl peptides substance is used as stabilizer in the invention, thereby obtaining the CdZnTe ternary quantum dots which have excellent stability and high fluorescent property. The invention can obtain water-soluble CdZnTe ternary quantum dots which have excellent dispersibility, uniform grain size and favorable fluorescent property under the mild reaction condition through adopting water solution preparation process and heating with oil bath companying with fully agitation.

The invention discloses a cadmium telluride quantum dot / titanium dioxide composite material and the application thereof. The cadmium telluride quantum dot / titanium dioxide composite material is prepared through the following steps: cadmium chloride anhydrous is dissolved into ionized water, mercaptoacetic acid is gradually added drop by drop according to the 1 to (0.2-5) molar ratio of cadmium chloride anhydrous to mercaptoacetic acid, a NaOH solution is used for adjusting the pH value to be alkaline, then a sodium hydrogen telluride solution is added, heating reflux lasts for 1 to 24 hours, and a prepared cadmium telluride quantum dot solution with the quantum dot grain size of 1 to 20nm is prepared; titanium iso-propoxide is dissolved into ethyl alcohol according to the 1 to (2-15) volume ratio of the titanium iso-propoxide to the cadmium telluride quantum dot solution, the cadmium telluride quantum dot solution is gradually added drop by drop, and then 30-minute stirring and 48-hour water-bath heating are performed, so that the cadmium telluride quantum dot / titanium dioxide composite material is obtained. According to the material provided by the invention, photocatalytic activity under visible light irradiation can be improved greatly, the sunlight use ratio is increased, the application scope of the titanium dioxide is expanded, and the composite material is suitable for removing indoor formaldehyde.

The invention discloses a method for synthesizing a Co-doped CdxCo1-xTe quantum dot by a hydrothermal method. The preparation method comprises the following operation steps: injecting prepared sodium hydrogen telluride NaHTe into a prepared mixed solution of cadmium salt, cobalt salt and water-soluble N-acetyl-L-cysteine under the protection of nitrogen gas to obtain a CdxCo1-xTe precursor solution; then placing the CdxCo1-xTe precursor solution into a hydrothermal reaction kettle; and reacting to prepare the Co-doped CdxCo1-xTe quantum dot with adjustable fluorescence-emission wave length and high fluorescence quantum yield. The method is carried out in an aqueous solution, and has the advantages of easily obtained raw materials, low cost, convenience and safety for operation, green and environmental protection and the like. The prepared Co-doped CdxCo1-xTe quantum dot is excellent in fluorescence property, good in biocompatibility, low in toxicity and can be applied to the field of biochemical analysis and biomedicine as a novel fluorescent nano-probe.

The invention discloses a preparation method of water soluble CdTe / CdS / ZnS nuclear / shell / shell type quantum dot. The method comprises the following steps of: preparing sodium hydrogen telluride NaHTe solution; preparing CdTe quantum dot solution; preparing water soluble CdTe / CdS nuclear / shell type quantum dot solution; and preparing water soluble CdTe / CdS / ZnS nuclear / shell / shell type quantum dot solution. The preparation method has the advantages of readily available raw materials, low cost and easiness in operation. The CdTe / CdS / ZnS nuclear / shell / shell type quantum dot prepared by the invention has the advantages of water solubility, adjustable fluorescence emission wavelength (540-710 nm), high fluorescence quantum yield (40-65 percent) and high bioavailability, and can be widely applied to the fields of biomedicines and disease diagnosis.

The invention discloses an in-situ preparation method for cadmium telluride / polyvinyl alcohol fluorescent fiber and relates to a preparation method for fluorescent fiber. The invention aims to solve the problems that in the prior method, the quantum dots of cadmium telluride reunite easily in a polymer solution, the fluorescence of the fiber is led to be non-uniform, so that the fluorescent effect is poor. The in-situ preparation method comprises the following steps: firstly, sodium borohydride, tellurium powder and deionized water are mixed and reacted to obtain sodium hydrogen telluride solution under the condition of ice-water bath; secondly, polyvinyl alcohol solution is added to a three-necked flask, nitrogen is introduced to the three-necked flask while the solution in the flask is stirred, then CdCl.2.5 H2O and mercaptoacetic acid are added to the flask, sodium hydroxide solution is dropwise added to the flask while the solution in the flask is stirred, then sodium hydrogen telluride solution is added to the flask, and the solution in the flask is subjected to heating and reflux, so that telluride / polyvinyl alcohol spinning solution is obtained; and thirdly, the spinning solution is subjected to static spinning, so that the fluorescent fiber is obtained. With the in-situ preparation method, the quantum dots of cadmium telluride can be uniformly scattered in polymer, and the prepared fluorescent fiber has good fluorescent effect. The in-situ preparation method is used for preparing the fluorescent fiber.

The invention relates to a method for surface modification of ZnSe:Ag quantum dots, and belongs to the technical field of composite nano microcrystalline materials. A preparation method comprises the steps: based on the preapred ZnSe:Ag quantum dots, thiourea and ZnTe are adopted for modifying the surface of the quantum dots. The modification process is carried out in a water phase, and the reaction temperature is 100 DEG C. Thiourea is used for direct surface modification to form ZnSe:Ag / ZnS quantum dots; ZnTe modification adopts a prepared Te source, that is to say, sodium borohydride (NaBH4) and a Te powder are utilized to undergo a reaction to prepare sodium hydrogen telluride (NaHTe), then NaHTe is injected into the prepared ZnSe:Ag quantum dots, and a reaction of the two components is carried out to generate a ZnSe:Ag / ZnTe quantum dot solution. The obtained product is uniform in dispersion, good in stability, and little in aggregation, and can be applied to the fields of biological fluorescent labeling, drug separation and some optoelectronic devices.

The invention discloses a preparation method of a CdTe / CdS / ZnS / SiO2 quantum dot. The preparation method comprises the steps: firstly, synthesizing mononuclear CdTeQDs by using cadmium acetate, mercaptopropionic acid and sodium hydrogen telluride in a water phase; then, transferring a reaction solution of CdTeQDs which is cooled to room temperature into a precursor which contains cadmium acetate, zinc sulfate and the mercaptopropionic acid and has the pH value of 9.0-10.0, uniformly mixing and stirring, adding a sodium sulphide solution, and carrying out backflow reaction to synthesize double-shell CdTe / CdS / ZnSQDs; and finally, directly adding tetraethyl orthosilicate in a reaction solution of the CdTe / CdS / ZnSQDs, and carrying out backflow reaction to synthesize CdTe / CdS / ZnS / SiO2QDs. The preparation method is used for synthesizing the CdTe / CdS / ZnS / SiO2QDs by using a direct method and is simple to operate, needs mild conditions, and is low in cost and friendly to the environment. The synthesized product CdTe / CdS / ZnS / SiO2QDs is good in water solubility, high in stability, uniform in size and excellent in optical performance.

The invention provides a preparation method for two-dimensional hexagonal tellurium nanosheets. The preparation method comprises the following steps: preparing a mixed system: providing a stabilizer and dissolving the stabilizer in absolute alcohol, transferring the absolute alcohol containing the stabilizer into a container, stirring the absolute alcohol solution containing the stabilizer and adding a sodium hydrogen telluride solution into the absolute alcohol solution, and sealing the container and transferring the container to the condition of a 30-60 DEG C for reaction for 5-30 minutes toprepare the mixed system containing the two-dimensional hexagonal tellurium nanosheets; purifying the two-dimensional hexagonal tellurium nanosheets: centrifugally collecting the two-dimensional hexagonal tellurium nanosheets from the mixed system containing the two-dimensional hexagonal tellurium nanosheets for precipitation, and performing vacuum drying to prepare the two-dimensional hexagonaltellurium nanosheets. The preparation method for the two-dimensional hexagonal tellurium nanosheets of the invention has the advantages of simple operation, low cost, energy saving and environmental protection, short required reaction time, and the like. The invention further provides application of the preparation method for the two-dimensional hexagonal tellurium nanosheets.

The invention discloses a method for preparing near-infrared cadmium telluride quantum dots through hydrothermal treatment. The method comprises the following steps: respectively adding a cadmium saltsolution and a sulfydryl ligand into an aqueous solution, and performing uniform mixing so as to obtain a mixed solution, wherein the mole ratio of the sulfydryl ligand to the cadmium salt is (2-4):1; adjusting the pH value of the mixed solution to 9-11, introducing nitrogen for 30 minutes or longer, adding a sodium hydrogen telluride aqueous solution, and performing uniform mixing so as to obtain a cadmium telluride precursor solution, wherein the mole ratio of the cadmium telluride to cadmium ions is (0.1-0.2):1; heating the cadmium telluride precursor solution for 5 minutes, adding a precipitant, performing centrifugation, removing supernate, adding water, and performing secondary dissolution; adding the cadmium salt solution and the sulfydryl ligand into the dissolved cadmium telluride quantum dots, wherein the mole ratio of thiohydracrylic acid to cadmium chloride is (2-4):1; and adjusting the pH value of the mixed solution to 9-11, and performing heating for a certain time, so as to obtain the cadmium telluride quantum dots with near-infrared light emission. By adopting the method disclosed by the invention, near-infrared cadmium telluride quantum dots can be prepared, and the obtained cadmium telluride quantum dots have good lattice structures.

The invention discloses a positively charged water-soluble cadmium telluride quantum dot preparation method, which comprises: respectively adding a cadmium salt solution and a mercapto ligand to an aqueous solution, and uniformly mixing to obtain a mixed solution, wherein a molar ratio of mercaptopropionic acid to cadmium chloride is 2-4:1; adjusting the pH value of the mixed solution to 9-11, introducing nitrogen for more than 30 min, adding a sodium hydrogen telluride aqueous solution, and uniformly mixing to obtain a cadmium telluride precursor solution, wherein a molar ratio of sodium hydrogen telluride to cadmium ions is 0.1-0.2:1; and diluting the cadmium telluride precursor solution by using an aqueous solution, and heating to obtain the water-soluble cadmium telluride quantum dots. With the method of the present invention, the water-soluble quantum dots can be prepared quickly, the fastest red cadmium telluride quantum dot obtaining time is only 1 h, and the obtained cadmium telluride quantum dots have the good lattice structure.

The invention discloses a preparation method of CdHgTe alloy quantum dots. The method comprises the following steps: A, reducing tellurium powder through potassium borohydride to prepare a potassium hydrogen telluride solution, namely weighing potassium borohydride and the tellurium powder in a test tube with a soft plug respectively, and adding high-purity water; B, weighing CdCl2.2.5H2O crystals, and dissolving in the high-purity water to obtain a cadmium chloride solution; C, weighing HgCl2 crystals, and dissolving in the high-purity water to obtain a mercury chloride solution; D, adding transferred thiohydracrylic acid into a cadmium chloride and mercury chloride mixed solution, and adjusting the pH value by using a sodium hydroxide solution; E, removing dissolved oxygen, adding the potassium hydrogen telluride solution, continuously introducing nitrogen, and mixing; F, irradiating a raw solution by indoor light to obtain a solution of the CdHgTe alloy quantum dots at different wavebands; G, adding isopropanol for purifying, and freeze-drying to obtain solid powder of the CdHgTe alloy quantum dots. The process is simple and easy to control; raw materials are low in price and easily available; the synthesized CdHgTe alloy quantum dots are small in particle size and very good in biocompatibility and can be used for marking fixed cells.

The invention provides a method for preparing cadmium telluride / ferroferric oxide magnetic fluorescent fiber through an in-situ method, relates to a method for preparing fluorescent fiber and aims to solve the technical problem that quantum dots have poor dispersity in a polymer. The method comprises the following steps: 1, preparing a sodium hydrogen telluride solution; 2, preparing a sodium hydroxide solution; 3, preparing a polyvinyl alcohol solution; 4, preparing a cadmium telluride quantum dot / ferroferric oxide / polyvinyl alcohol compound liquid; and 5, performing electrostatic spinning on the cadmium telluride quantum dot / ferroferric oxide / polyvinyl alcohol compound liquid obtained in the step 4. By preparing water-based cadmium telluride quantum dots through an in-situ method, compounding with polyvinyl alcohol and performing conventional electrostatic spinning to prepare the fluorescent fiber, the fluorescent fiber can be obtained without dyeing the fiber, and people do not need to worry about the situation that the fluorescent effect of the fiber is influenced due to the fall-off of dye on the surface of the fiber. The method provided by the invention is simple and high in operability.

The invention discloses a synthesis method and application of cadmium telluride quantum dots, and relates to the technical field of quantum dot synthesis, and the technical key point is that the synthesis method comprises the following steps: S1, preparing a potassium hydrogen telluride solution; s2, synthesizing cadmium telluride quantum dots CdTeQDs: taking a 250 mL three-necked bottle, sequentially adding 1 mL of a CdCl2 solution with the concentration of 0.1 mol.L <-1 >, 180 mL of deionized water and thioglycollic acid (TGA), fully mixing, adjusting the pH value of the solution in the three-necked bottle to 8.6-10.2 by using 1.0 mol.L <-1 > NaOH, introducing nitrogen to remove oxygen for 30 minutes, rapidly adding 0.125-0.750 mL of a newly prepared potassium hydrogen telluride solution into the three-necked bottle, and heating and refluxing at the temperature of 100 DEG C for 3.0-5.5 hours to prepare a cadmium telluride quantum dot CdTeQDs solution. By optimizing and improving synthesis conditions such as the addition amount of synthesis raw materials and synthesis heating reflux time, the synthesized cadmium telluride quantum dots are good in stability and high in fluorescence quantum yield; meanwhile, the synthesized cadmium telluride quantum dots are high in detection sensitivity when being used for detecting the copper ions in the water body.

The invention relates to a single crystal zinc telluride nanorod with blue fluorescence and a preparation method thereof as well as application of the nanorod in a light-emitting diode (LED) luminous device and belongs to the technical fields of semiconductor fluorescent materials and devices. The nanorod is of a single crystal structure and has the diameter of 1-12nm and the length of 3-150nm; the emission wavelength ranges from 410 to 430nm; the fluorescent quantum yield is 20-80 percent. The preparation method comprises the following steps: by taking water as an aqueous phase, by taking a long-chain ligand dissolved in an organic solution of a zinc source as an oil phase, stirring at a high speed to fully contact the aqueous phase and the oil phase in the protective gas atmosphere, and forming a precursor solution; injecting an aqueous solution of sodium hydrogen telluride into the precursor solution, stirring, heating and reacting; and precipitating, centrifuging, dispersing, removing the unreacted raw materials, thereby obtaining the single crystal zinc telluride nanorod. The prepared single crystal zinc telluride nanorod with blue fluorescence can stably emit blue fluorescence and is high in fluorescence yield.

The invention discloses a preparation method of telluride starch-based bionic glutathione peroxidase, which comprises the following steps: 1) taking cassava starch, adding water to prepare a starch emulsion, diluting octenyl succinic anhydride with ethanol, and adding the diluted octenyl succinic anhydride into the starch emulsion to react; 3) after the reaction is finished, sequentially washing with deionized water and ethanol, and performing filtering and drying to obtain starch octenylsuccinate; 4) reacting tellurium and potassium borohydride with water in a nitrogen atmosphere to prepare a sodium hydrogen telluride solution; 5) dispersing starch octenylsuccinate into absolute ethyl alcohol, and adding the sodium hydrogen telluride solution into the starch octenylsuccinate dispersion liquid in a nitrogen atmosphere for reaction; 6) after the reaction is finished, performing washing, carrying out suction filtration, and performing drying to obtain the starch octenylsuccinate telluride. According to the starch telluride-based bionic glutathione peroxidase prepared by the method disclosed by the invention, the raw materials are conventional materials and are relatively low in cost, and the prepared GPx stimulant is excellent in catalytic activity.

The invention relates to a flame-retardant anti-counterfeiting paper preparation method, which can effectively solve the problems of easy burning, easy imitating and insufficiently-high fluorescence intensity of the existing anti-counterfeiting paper. The method comprises: under N2 protection, adding tellurium powder and sodium borohydride to ethanol and water, heating, carrying out a reaction to produce sodium tellurium hydride, adding dilute sulfuric acid, absorbing the generated hydrogen telluride by using a sodium hydroxide solution to generate a sodium tellurium hydride solution, injecting the sodium tellurium hydride solution into a thioglycolic acid stabilizer and a cadmium chloride aqueous solution under stirring, carrying out heating reflux, sampling at different reflux times to obtain the suspensions of CdTe quantum dots having different particle sizes and different emission wavelengths, adding a dissolved paper pulp, ammonium polyphosphate, zinc borate, aluminum hydroxide and phosphoric acid to water, respectively adding the CdTe quantum dot suspensions obtained at different reflux times, stirring, carrying out papermaking with a paper machine, and drying to obtain the flame-retardant anti-counterfeiting paper. According to the present invention, the flame-retardant anti-counterfeiting paper has advantages of rich raw material, simple preparation method, easy production, low cost, good anti-counterfeiting effect, good fire resistance, energy saving, and environmental protection.

The invention discloses a preparation method of Ag+ doped CdTe quantum dots, a product thereof and application of the product in Hg2+ detection. The preparation method includes the following steps that (1) soluble salt of metal Cd, soluble salt of metal Ag and a stabilizer are mixed and dissolved in deionized water, the pH value is regulated to be 4.5-6, and a mixed solution is obtained; (2) undera protective atmosphere, a newly-prepared sodium hydrogen telluride solution and the mixed solution prepared in step (1) are mixed to be uniform, and after a reflux condensation reaction, aftertreatment is performed to obtain CdTe:Ag+ powder; (3) a ligand exchange is adopted to prepare the Ag+ doped CdTe quantum dots. According to the preparation method, the process is simple and controllable; the prepared Ag+ doped CdTe quantum dots form new doping peaks in photoluminescence spectra, so that when a quantum dot fluorescence probe is used for Hg2+ detection, the fluorescence intensity and theHg2+ concentration have two linear correlation regions, and the Hg2+ detection range of the quantum dot fluorescence probe is widened.

The invention relates to preparation of in-situ doped CdTe:Mn quantum dots. The doped CdTe:Mn quantum dots are synthesized by aqueous-phase synthesis with sodium hydrogen telluride (NaHTe) as a precursor, cadmium chloride (CdCl2) as a cadmium source and manganese sulfate (MnSO4) as a manganese source. The material is characterized by a fluorospectrophotometer (FL), Fourier transform infrared spectroscopy (FTIR) and an X-ray diffractomer (XRD). The CdTe:Mn quantum dots with good fluorescence properties are obtained by adjusting the parameters affecting the quantum dots, such as the temperature,the pH value, the reaction time and the amount of reactants.

The invention discloses a microwave preparation method of water soluble Pr doped Pr:CdTe quantum dots. The method includes the steps: placing sodium borohydride and a tellurium powder in water with the mole ratio of 5.1:1, under nitrogen protection, placing in a microwave synthesizer, heating to 70-80 DEG C, carrying out a stirring reaction for 1-2 minutes, then heating to 90-95 DEG C, and carrying out a stirring reaction for 2-3 minutes, to obtain a sodium hydrogen telluride solution; then adding a water soluble N-acetyl-L-cysteine solution of a cadmium salt, a praseodymium salt and a modifier in a container, injecting the sodium hydrogen telluride solution, and then introducing nitrogen for 2-3 minutes from the upper side of the solution to the lower side of the solution, to obtain a Pr doped Pr:CdTe quantum dot precursor solution; and finally placing the precursor solution in a microwave reactor, and carrying out a heating reaction to obtain a water soluble Pr doped Pr:CdTe quantum dot solution. The method has the advantages of energy saving, high efficiency, rapid and uniform heating, no pollution, and convenient control.

The invention discloses a method of synthesizing a rear earth Dy-doped CdTe:Dy quantum dot by a hydrothermal process. Operation steps of the preparation method are as follows: under protection of nitrogen gas, injecting pre-prepared sodium hydrogen telluride liquor into mixed liquor of pre-prepared cadmium salt, dysprosium oxide and a modifier water-soluble N-acetyl-L-cysteine; and then, placing the liquor into a hydrothermal reaction kettle for reacting and preparing the rear earth Dy-doped CdTe:Dy quantum dot which is adjustable in fluorescence emission wavelength and high in fluorescence quantum yield. The hydrothermal process has advantages of being low in operation cost, simple, convenient and safe to operate, green, environment-friendly, and the like. The obtained rear earth Dy-doped CdTe:Dy quantum dot has the advantages of being excellent in fluorescence performance, good in biocompatibility, low in toxicity, and the like, and can be used as a novel fluorescence nanoprobe for being widely applied to biochemical analysis and the biomedicine field.

The invention discloses a one-pot preparation method for an electrochemiluminescence material. The method includes the steps that a mixture solution of cadmium chloride, thiol hydrochloride and sodium hydrogen telluride is prepared, wherein the molar ratio of cadmium chloride to thiol hydrochloride to sodium hydrogen telluride is 1: (1-3.0): (0.04-0.1); the mixture solution is subjected to heating reflux for 0.5-10.5 hours at 115-125 DEG C under a stirring condition, and then the electrochemiluminescence material is obtained. Thiol hydrochloride is hydrochloride of a compound shown in the chemical formula 1, and the electrochemiluminescence material is cadmium telluride quantum dots coated by a compound shown in the chemical formula 1. The invention further discloses the electrochemiluminescence material prepared by the adoption of the one-pot preparation method of the material. The one-pot method for preparing the electrochemiluminescence material is simple, efficient, convenient, low in cost and wide in application range, the purpose of large-scale application is easy to achieve, and industrial production is easy to achieve; the prepared electrochemiluminescence material can also generate strong luminous signals under the condition that a solution does not contain a co-reaction agent, and not only is the situation avoided that the co-reaction agent is introduced into the solution, but also the efficiency and signals of electrochemiluminescence can be effectively improved.