32 results about "Quantum dot molecules" patented technology

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 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 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 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 preparation method of CdTe / CdSe@MIPs QDs molecularly imprinted polymer, which uses water-phase CdTe / CdSe quantum dots modified with thioglycolic acid (TGA) as a fluorescent carrier, and silanizes the surface to obtain TC was used as a template molecule, 3‑aminopropyltriethoxysilane was used as a functional monomer, tetraethylorthosilicate was used as a crosslinking agent, and ammonia water was used as a catalyst to successfully prepare a molecularly imprinted polymer (CdTe / CdSe) on the surface of quantum dots. @MIPs QDs), the experimental preparation process is simple. The CdTe / CdSe@MIPs QDs use tetracycline as a template molecule, through the interaction between the functional monomer and the cross-linking agent, a quantum dot molecularly imprinted polymer with a tetracycline-specific recognition site is formed, and the target The specific recognition of tetracycline can meet the requirements of high selectivity determination of the target in substances similar to the molecular structure of the template.

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 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).