31 results about "Quantum dot molecules" patented technology

The invention discloses a quantum dot molecular imprinting microsphere quartz fluorescent sensor for detecting multicomponent food additives simultaneously and a method for detecting the food additives by the quantum dot molecular imprinting microsphere quartz fluorescent sensor. A method for preparing a quantum dot molecular imprinting microsphere comb quartz plate comprises the following steps of: selecting functional monomers corresponding to the food additives; preparing quantum dots and preparing quantum dot molecular imprinting microspheres according to the literature; and modifying thesurfaces of different probes of the comb quartz plate with the imprinting microspheres of different food additives by utilizing layer-upon-layer accumulated surface modification technology. The method for detecting the trace multicomponent food additives simultaneously (which is shown as the figure) comprises the following steps of: immersing the modified quartz plate into simply-pulpified food solution, arranging the quartz plate on a sealing quartz vessel, and detecting the food additives in a sample. The quantum dot molecular imprinting microsphere quartz fluorescent sensor has high specificity and sensitivity, short detection time and low cost; and in a method for detecting pesticide residues by fluorescent light, the operation is simple and quick, and reactions and results are completed and recorded automatically by instruments.

The invention belongs to the technical field of preparation of molecularly imprinting fluorescent probes and especially relates to a CdTe/CdS quantum dot-molecularly imprinting polymer (QDs-MIP) and an application of the QDs-MIP as a fluorescent probe in detection and analysis of perfluorooctanic acid. The invention aims to solve a technical problem of providing a quick, simple, sensitive and high-selective method for detecting the perfluorooctanic acid and provides a quantum dot surface perfluorooctanic acid molecularly imprinting polymer and an application thereof. The polymer is a fluorescent molecularly imprinting polymer which is prepared by embedding a molecular recognition site into the surface of a TEOS-coated CdTe/CdS quantum dot with the perfluorooctanic acid as a template molecule. The molecularly imprinting polymer is high in sensitivity, is simple in detection, is high in selectivity and affinity and can be directly applied in detection of the perfluorooctanic acid in environment. The molecularly imprinting polymer not only can reduce a detection cost but also can increase detection efficiency.

The invention discloses a highly selective multi-component printing molecularly imprinted paper chip fluorescence sensor and a method for detecting heavy metal ions with the sensor. A fabrication method of the printing molecularly imprinted paper chip fluorescence sensor comprises the following steps: selecting functional monomers corresponding to the metal ions, fabricating quantum dots, preparing quantum dot molecularly imprinted mixed solutions according to documents, printing the quantum dot molecularly imprinted mixed solutions of the different metal ions on paper with a printer, conducting ultraviolet radiation, and fabricating the printing molecularly imprinted paper chip fluorescence sensor. The highly selective multi-component method for simultaneously detecting heavy metal ion pollutants comprises the following steps: soaking the fabricated printing molecularly imprinted paper chip fluorescence sensor into a water body sample, soaking the sensor fully with a short-wave transmission saturated fluorescence reagent, and detecting the heavy metal ions in the sample. The sensor is high in specificity, high in sensitivity, short in detecting time, low in cost and convenient to handle. The fluorescence detection method for the heavy metal ions is simple and quick to operate, and reactions and results are completed and recorded by an instrument automatically.

The invention discloses a preparation method and application of a molecularly-imprinted electrochemiluminescence sensing material based on quantum dot electrochemiluminescence for adsorbing trace 2-methyl--chlorophenoxy acetic acid (MCPA). The preparation method of the sensing material comprises the steps that gold nanoparticles and a CdSe-ZnS quantum dot function material which are functionally modified with sodium 2-mercaptoethanesulfonate and p-hydroxy thiophenol are prepared, the MCPA and the prepared function material is mixed, the surface of a gold electrode is modified with the material through electrochemical polymerization film forming, and an electrode modified with diphenylamine-crosslinked nanogold and a quantum dot network array molecularly-imprinted electrochemiluminescence material is prepared after the MCPA is eluted. The preparation method has the advantages that the quantum dot molecularly-imprinted electrochemiluminescence sensing material is synthesized through one step by adopting an electropolymerization method; the sensing material combines the electrochemiluminescence of quantum dots and the specific recognition of molecularly-imprinted polymers, the defects existing in an existing method for preparing the solid luminescence electrode are overcome, and the wide application prospect is achieved.

A solid-state device for generating a single photon for quantum information processing, the device including: a quantum dot molecule including: a first singly-charged quantum dot; and a second singly-charged quantum dot; wherein the first singly-charged quantum dot is adjacent to the second singly-charged quantum dot; and a tunnel barrier that separates the first singly-charged quantum dot from the second singly-charged quantum dot.

The invention discloses a preparation method of a CdTe/CdSe@MIPs QDs molecularly imprinted polymer, which comprises the following steps: by using thioglycolic acid (TGA)-modified water-phase CdTe/CdSequantum dots as a fluorescent carrier, carrying out silanization modification on the surface of the fluorescent carrier; with TC as a template molecule and 3-aminopropyltriethoxysilane as a functional monomer, tetraethoxysilane as a crosslinking agent and ammonia water as a catalyst, successfully preparing the quantum dot surface molecularly imprinted polymer (CdTe/CdSe@MIPs QDs), wherein the experimental preparation process is simple. According to the CdTe/CdSe@MIPs QDs, tetracycline is taken as a template molecule, a quantum dot molecularly imprinted polymer with tetracycline specific recognition sites is formed through interaction of a functional monomer and a cross-linking agent, specific recognition of tetracycline of a target object is achieved, and the requirement for high-selectivity measurement of the target object is reached in substances similar to a template molecular structure.

The invention discloses a preparation method of a carbon quantum dot-molecularly imprinted composite material and a method using carbon quantum dot-molecularly imprinted composite material to analyzeresidues of mesotrione pesticide, and relates to a preparation method of a carbon quantum dot-molecularly imprinted composite material and a method for analyzing mesotrione pesticide. The preparationmethod and the analyzing method aim at solving the problems of long mesotrione analyzing time and low selectivity in the prior art and high cost and large pollution to environment in the synthezing method of the quantum dot molecularly imprinted composite material. The preparation method comprises the following steps of 1, preparing carbon quantum dots; 2, modifying the carbon quantum dots; 3, imprinting molecules, so as to obtain the carbon quantum dot-molecularly imprinted composite material. The analyzing method comprises the following steps of 1, preparing a dispersion liquid; 2, detectingfluorescent intensity of a contrast group; 3, determining quenching constant Ksv; 4, detecting a to-be-detected sample, and calculating the content Qu of the mesotrione in the to-be-detected sample.The analyzing method is mainly used for analyzing the residues of the mesotrione pesticide in an environment water sample.

The invention provides a magnetic quantum dot molecular imprinting material used for detecting bisphenol A and application, and belongs to the technical field of analytic sensing. An electrochemiluminescence sensor of a molecular imprinting compound based on doping of a magnetic material and quantum dots is disclosed, and precise detection of an environmental hormone bisphenol A is achieved by utilizing the specific recognition effect of a molecular imprinting technique, the efficient separating and electrode modification effect of a magnetic composite structure and the high-sensitivity response of electrochemiluminescence signals of the quantum dots to bisphenol A, wherein the concentration detection range of bisphenol A is from 1*10<-9> M to 1*10<-4> M, and the detection limit is 3.4*10<-10> M. The sensor is high in sensitivity and selectivity, convenient to operate, good in stability, high in reproducibility and the like, and a novel and effective method is provided for the detection of environment hormones of industrial water, rivers and the like, and has a significant application prospect.

The invention provides a stage cosmetic and a preparation method thereof. The cosmetic contains fluorescent carbon quantum dot powder; cosmetic preparation steps are as follows: Step 1: feeding the fluorescent carbon quantum dot powder and ultrafine pearl powder, titanium dioxide and silicon dioxide into a powder mixing tank according to the above proportions for pulverization and grinding to obtain pigment powder; Step 2: uniformly mixing water, isopropyl stearate and hyaluronic acid in the above proportions, and then heating the mixture to 45 to 50 DEG C, adding a natural surfactant and guargum, and uniformly mixing the natural surfactant and the guar gum; Step 3: uniformly mixing the mixed liquid obtained in the step 2 with the pigment powder prepared in the step 1, sieving the mixturewith a sieve of 40 to 80 meshes, and pressing the powder into a powder cake, thereby obtaining the stage cosmetic. The stage cosmetic solves the problem of low color rendering index of an existing cosmetic by adding fluorescent carbon quantum dots into the cosmetic; meanwhile, the fluorescent carbon quantum dots are not easily absorbed by the skin thanks to a relatively large molecular weight, thereby solving the problem that the existing cosmetic is difficult to clean. In addition, the fluorescent carbon quantum dots are from fruits and vegetables, so that the cosmetic is environmentally friendly and safe.

The invention provides a method for separating graphene quantum dots by using a molecular sieve. A graphene quantum dot solution is injected into a compacted molecular sieve, quantum dots with relatively small particle sizes penetrate through apertures of the molecular sieve along with a solvent through a physical method, and the graphene quantum dots similar to the apertures of the molecular sieve can enter the molecular sieve to form a graphene quantum dot-molecular sieve; the graphene quantum dots with the pore diameter larger than that of the molecular sieve can be remained on the molecular sieve, so that the size separation of the graphene quantum dots is realized. The graphene quantum dots in the graphene quantum dot-molecular sieve can be separated from the molecular sieve under theaction of ultrasound and a desorption agent, the obtained quantum dot solution with the remaining size can be separated again, and the graphene quantum dots which are uniform in distribution, high inpurity and target in size are obtained.

The invention discloses a molecular imprinting fluorescence sensor for quantitative detection of alkylresorcinol, and a preparation method thereof, and relates to the technical field of chemical analysis. The preparation method comprises the following steps: (1) preparing a NaHTe aqueous solution; (2) preparing CdTe quantum dots; and (3) preparing a molecular imprinting fluorescence sensor: uniformly mixing the CdTe quantum dots obtained in the step (2) with a pore-foaming agent, introducing N2 to remove oxygen, adding ARs to react for 10-30 minutes, then adding a functional monomer, a cross-linking agent and ammonia water, introducing N2, stirring at 50-70 DEG C to react for 12-36 hours, removing ARs from the obtained precipitate after the reaction is finished, and drying to obtain the molecular imprinting fluorescence sensor. The fluorescence sensor is good in polymerization degree, capable of being used for rapidly and effectively achieving ARs quantitative detection, good in detection stability and high in selectivity.

The invention discloses a preparation method of a quantum point, an application method and a quantum point product, and relates to the technical field of the quantum point. The quantum point is applied to a quantum point solution, water oxygen molecules and other quantum point molecule are prevented from invading into quantum point nucleus, so that the glowing effect and the glowing efficiency ofthe quantum point are improved. The main technical scheme of the invention is the preparation method of the quantum point, and the preparation method comprises the following steps: firstly, dissolvinga quantum point sample into an organic solvent to obtain a sample solution; then dissolving a reticular ligand into the sample solution to obtain the quantum point with the reticular ligand. The preparation method of the quantum point, the application method and the quantum point product disclosed by the invention are mainly used for storing the quantum point.

The invention provides an arsenic fluorescent quantum dot, a preparation method and application thereof. The molecular formula of the quantum dot is As4S4@HA QDs, wherein As4S4 and HA are realgar and hyaluronic acid respectively; hyaluronic acid serves as a stabilizer of the arsenic fluorescent quantum dot; and a stable HA hydration film is formed on the surface of the arsenic fluorescent quantum dot. The preparation method comprises the following steps of: dissolving the realgar in ethylenediamine, taking the hyaluronic acid as a stabilizer, and adding hydrochloric acid to adjust the pH value, so as to form the arsenic fluorescent quantum dot with a stable morphological structure. The quantum dot disclosed by the invention is simple in preparation method and stable in structure; intracellular delivery can be traced in real time in a spontaneous strong fluorescence mode; tumour cells are specifically recognized through the hyaluronic acid ligand; tumour targeted delivery is achieved; the tumour cells are selectively killed; potential toxic and side effects are reduced; and the quantum dot has wide application prospect.

The invention relates to a telomerase activity detection kit, which comprises a telomerase substrate primer, dNTPs, a telomerase reverse transcription buffer solution and a quantum dot molecular beacon, wherein the quantum dot molecular beacon is composed of an oligonucleotide stem-loop, a quantum dot fluorophore and a quenching group, the quantum dot fluorophore is connected with the 5' end of the sequence of the oligonucleotide stem-loop, the quenching group is connected with the 3' end of the sequence of the oligonucleotide stem-loop, the quantum dot fluorophore is preferably CdTe:Zn<2+> quantum dots, the quenching group is preferably BHQ2, and the quantum dot molecular beacon is preferably QD-BHQ2. Accordinto the invention, the quantum dot molecular beacon does not need excessive chemical modification, does not need signal amplification, has excellent biocompatibility, fluorescence recovery, detection sensitivity and light stability, and does not have cytotoxicity; and the telomerase activity detection kit can be directly used for sensitive visual detection of telomerase activity.