32 results about "Quantum dot molecules" patented technology

A molecular analysis device comprises a molecule sensor and a nanopore that passes through, partially through, or substantially near the molecule sensor. The molecule sensor may comprise a single electron transistor including a first terminal, a second terminal, and a nanogap or at least one quantum dot positioned between the first terminal and the second terminal. The molecular sensor may also comprise a nanowire that operably couples a first and a second terminal. A nitrogenous material that may be disposed on at least part of the molecule sensor is configured for a chemical interaction with an identifiable configuration of a molecule. The molecule sensor develops an electronic effect responsive to a molecule or responsive to a chemical interaction.

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 provides a QLED, a preparation method and a display apparatus. The QLED comprises a substrate, a positive electrode, a hole transport layer, a light emitting layer, an electron transport layer and a negative electrode in sequence; the light emitting layer comprises quantum dots and a dispersing agent with a dendritic molecular structure; and the quantum dots are dispersed among side chains of the dendritic molecules. Compared with long-chain ligands on the surfaces of the quantum dots, an insulating layer is not formed on the surfaces of the quantum dots in the dendritic molecular structure, so that charge injection potential barrier of impedance, holes and electrons to the quantum dots on the surfaces of the quantum dots can be greatly lowered; in addition, the spacings between the quantum dot molecules, between quantum dots and the electron transport layer, and between the quantum dots and the hole transport layer can be closer, thereby improving the concentration of the quantum dots in the light emitting layer, and the exciton energy transfer efficiency; and by virtue of the OLED, the dispersity and yield of the quantum dots can be ensured while the current carrier energy transfer validity can be reinforced, thereby enhancing the light emitting efficiency of the OLED and the luminance of the OLED display apparatus.

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.

The invention discloses a preparation of a silanized cadmium telluride quantum dot molecularly imprinted polymer. An aqueous phase CdTe QDs modified by thioglycolic acid (TGA) is used as a fluorescentcarrier, the surface of the fluorescent carrier is subjected to alkylation modification, then paracetamol is used as a template molecule, 3-aminopropyltriethoxysilane is uses as a functional monomer,ethyl orthosilicate is used as a cross-linking agent, ammonia water is used as a catalyst, and a polymer in which the outer layer of quantum dots is coated with molecular imprinting is successfully synthesized. Results of selective adsorption experiments show that the prepared CdTe@MIPs QDs has hole sites of a target molecule AP, and can selectively recognize AP from a complex matrix, the recognition is not easily interfered by other structural analogs, and results show that the method has good molecular recognition performance for AP molecules.

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.

A polymer composite comprising quantum dots. The polymer composite comprises: (a) quantum dots; (b) a first polymer having a molecular weight from 1,000 to 100,000 and a solubility parameter from 12 to 17 (J / cm3)1 / 2; (c) a second polymer comprising polymerized units of a first compound comprising at least one readily polymerizable vinyl group and having a molecular weight from 72 to 500, wherein the second polymer has a solubility parameter from 16.5 to 20 (J / cm3)1 / 2; and (d) a third polymer comprising polymerized units of a second compound comprising at least two readily polymerizable vinyl groups and having a molecular weight from 72 to 2000; wherein the first polymer encapsulates the quantum dots; wherein a readily polymerizable vinyl group is part of a (meth)acrylate ester group or is attached directly to an aromatic ring.

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 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 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 relates to a quantum dot molecular light emitting device, which sequentially comprises the following structures from bottom to top: a lower gold germanium nickel metal electrode layer (1), a gallium arsenic substrate (2), a gallium arsenic buffer layer (3), a n-type aluminum gallium arsenic lower cladding layer (4), a gallium arsenic lower waveguide limiting layer (5), a quantum dotmolecular active area, a gallium arsenic upper waveguide limiting layer (9), a p-type aluminum gallium arsenic upper cladding layer (10), a p-type gallium arsenic ohmic contact layer (11), a dioxide silicon insulating layer (12) and an upper titanium platinum gold metal electrode layer (13), wherein the quantum dot molecular active area comprises n quantum dot molecular layers each of which comprises quantum dot molecules (6), a stress buffer layer (7) and an isolated layer (8), and n is a natural number not less than 1. According to the invention, the laterally coupled quantum dot molecules are utilized to manufacture an active area structure and corresponding light emitting devices, thereby widening the applicable scope of quantum dot and improving the performance of low dimension semiconductor device.

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 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 provides an arsenic fluorescent quantum dot, a preparation method and application thereof, and the molecular formula of the quantum dot is As 4 S 4 @HA QDs, where As 4 S 4 and HA are realgar and hyaluronic acid, respectively. The arsenic fluorescent quantum dots use hyaluronic acid as a stabilizer to form a stable HA hydration film on its surface. The acid is used as a stabilizer, and hydrochloric acid is added to adjust the pH to form arsenic fluorescent quantum dots with stable morphology and structure. The quantum dot of the invention is simple in preparation method and stable in structure, can track intracellular delivery in real time by means of spontaneous strong fluorescence, and specifically recognize tumor cells through hyaluronic acid ligand, realize tumor-targeted delivery, and selectively kill tumor cells. And reduce potential toxic and side effects, with broad application prospects.

The invention discloses a preparation method and application of an adsorbed trace amount 2-methyl-4-chlorophenoxyacetic acid (MCPA) molecularly imprinted electrochemical luminescence sensing material based on quantum dot electrochemiluminescence. The preparation method of this sensing material: prepare the functional material of gold nanoparticles and CdSe / ZnS quantum dots of sodium 2-mercaptoethanesulfonate and p-mercaptothiophenol functional modification, and mix MCPA with the prepared functional material , use electrochemical polymerization to form a film to modify the material on the surface of the gold electrode, and prepare the electrode modified by the dianiline cross-linked nano-gold and the quantum dot network array molecularly imprinted electrochemiluminescent material after elution of MCPA. The invention has the advantage of adopting the method of electropolymerization to synthesize the quantum dot molecule imprinted electrochemiluminescence sensing material in one step. The sensing material combines the electrochemiluminescence of quantum dots with the specific recognition of molecularly imprinted polymers, overcomes the shortcomings of existing methods for preparing solid-state light-emitting electrodes, and has broad application prospects.

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.

The invention relates to a preparation method of a CsPbBr3 perovskite quantum dot-molecular imprinting fluorescence sensor for detecting omethoate. The method comprises the following steps: S1: preparation of APTES-terminated CsPbBr3 perovskite quantum dots; S2: preparation of a CsPbBr3 perovskite quantum dots-molecular imprinting polymer; and S3: elution of template molecule omethoate. The present invention also provides the CsPbBr3 perovskite quantum dot-molecular imprinting fluorescence sensor for detecting omethoate, which is prepared according to the above preparation method. The preparation method provided by the invention has mild reaction conditions, fast reaction speed and high yield; and the CsPbBr3 perovskite quantum dot-molecular imprinting fluorescence sensor provided by the invention has characteristics of high sensitivity and specific recognition for omethoate, a linear detection range is 50-400 ng / mL, a linear correlation coefficient is 0.997, the detection limit is 18.8 ng / mL, and the detection precision is 1.7% (RSD).

The invention provides a detection method of dichlorvos based on a CsPbBr3 quantum dot-molecularly imprinted mesoporous material. The method comprises the following steps: preparing the CsPbBr3 quantum dot-molecularly imprinted mesoporous material; drawing a standard working curve of ''fluorescence quenching intensity-dichlorvos concentration'', and calculating a working equation; and determiningthe dichlorvos content in a sample. The method has high detection sensitivity, strong specificity, short detection time and low detection limit.