The invention discloses a method for preparing yellow or green silicon quantum dots. The method comprises the following steps: (1) dispersing a silicon source, a first reducing agent and a second reducing agent into ultrapure water; then stirring under the protection of protective gas to obtain a mixed solution; (2) heating the mixed solution obtained by step (1) in a reaction container and reacting to obtain a silicon quantum dot solution; and (3) mixing the silicon quantum dot solution obtained by step (2) and an organic reagent and then centrifuging and drying to obtain solid silicon quantum dots. Based on a synergistic effect of the first reducing agent and the second reducing agent, the yellow or green silicon quantum dots with the high quantum yield are synthesized in one step through a simple water-phase method and the silicon quantum dots with different emission wavelengths can be synthesized through adjusting the temperature of heating reaction; and the quantum yield of the green silicon quantum dots is 38.31 percent and the quantum yield of the yellow silicon quantum dots is 29.36 percent.

Method for preparing yellow or green silicon quantum dots

The invention discloses fluorescent SiNDs (silicon nanodots). The fluorescent SiNDs are prepared from silane and Bengal rose with a hydrothermal method through one step. Compared with the prior art, the prepared SiNDs have ultrahigh fluorescent quantum yield (100%) and can realize long-time specific imaging of mammal cytolysosome. Besides, the imaging effect of lysosome of the SiNDs is not affected by cell cleaning, immobilization, permeabilization and the like and the fluorescent SiNDs have the advantages of cleaning resistance, immobilization resistance and permeabilization resistance. Meanwhile, the SiNDs also have the advantages of low preparation cost, simple synthesis method, good water dispersity, narrow fluorescent emission peak width, good photostability, good cytocompatibility, low photocytotoxicity and the like and are expected to become novel lysosome fluorescent probes.

Fluorescent SiNDs (silicon nanodots) as well as preparation method and application thereof

The invention relates to a preparation method and application of water-soluble blue fluorescence silicon quantum dot. The preparation method comprises the steps of taking silane as a silicon source, and preparing the water-soluble blue-fluorescence silicon quantum dot through the hydrothermal reaction between the silane and sodium citrate; the preparation method is easy to operate and low in cost.The silicon quantum dot prepared according to the method disclosed by the invention has high quantum efficiency, strong ultraviolet absorption, good monodispersity, good water solubility and pH stability, the photosynthesis of the chloroplast can be obviously improved after the silicon quantum dot is compounded with the chloroplast, thereby promoting the plant growth and the photosynthesis. The water-soluble blue fluorescence silicon quantum dot disclosed by the invention has the feature of enhancing the plant photosynthesis, can be used in the application to the plant photosynthesis and canbe mainly used in the application for preparing the plant nutrient solution.

Preparation method and application of water-soluble blue fluorescence silicon quantum dot

The invention relates to a water-soluble fluorescent silicon point as well as a preparation method and an application thereof. The water-soluble fluorescent silicon point is synthesized from (3-aminopropyl) trimethoxy silane as a precursor and ferulic acid as a reducer by a hydrothermal reaction. The fluorescent silicon point can be applied to detection of rutin content and identification of rutinand quercetin. The fluorescent silicon point has the advantages of being stable in performance, green and environmentally friendly, and the preparation method is simple. The fluorescent silicon pointas a spectral signal probe can realize rutin detection in a serum system or a phosphate buffer system containing a small amount of BSA, and other common traditional Chinese medicine active substancesincluding quercetin have no obvious interference effect on a detection result. The detection method has the advantages of being fast, simple, good in detection sensitivity, high in selectivity and the like, defects of poor sensitivity, high interference, complicated pretreatment or expensive instruments of a conventional detection method are overcome, and the detection method is a simple and practical pharmaceutical analysis and quantification technology.

Water-soluble fluorescent silicon point as well as preparation method and application thereof

The invention discloses a synthesis method of chiral copper sulfide superparticles, and belongs to the technical field of nanometer materials and self-assembly science. Penicillamine-stabilized chiralcuprous sulfide nanoclusters and tobacco mosaic virus capsid protein are subjected to self-assembly under the action of light to obtain cake-shaped chiral cuprous sulfide superparticles. The invention provides a light-operated preparation method of chiral copper sulphide superparticles, and the preparation method has important significance for developing more chiral materials and understanding the interaction between the chiral materials.

Synthesis method of chiral copper sulfide superparticles

The invention belongs to the technical field of preparation methods of nano materials and particularly discloses a method for preparing high-yield fluorescent silicon quantum dots by virtue of a hydrothermal method or a microwave method. According to the method, a silicon source is urea propyl trimethoxy silane or urea propyl triethoxy silane; the raw material cost is low, the raw material source is rich, the operation steps are simple, the yield of the prepared quantum dots is high, and the large-scale production and the environmental protection are easily realized; the prepared quantum dots have excellent optical properties and good biocompatibility, and the particle size distribution is uniform; and the silicon quantum dots can be widely applied to the aspects of optoelectronics, solar energy conversion, biosensors, fluorescence probes and the like.

Method for preparing high-yield fluorescent silicon quantum dots by virtue of hydrothermal method or microwave method

The invention discloses a silicon quantum dot aqueous phase preparation method. The method includes the following steps that firstly, a reduction agent and a silane coupling agent are obtained and dissolved in water under inertia gas protection, wherein the molar ratio of the silane coupling agent to the reduction agent is 1:(0.2-10); secondly, the mixed solution obtained in the first step is conveyed into a high-pressure reaction kettle to be heated to 140-220 DEG C, and a silicon quantum dot solution can be obtained after reaction; or the mixed solution obtained in the first step is conveyed into a microwave reaction kettle to be heated to 140-220 DEG C, and a silicon quantum dot solution can be obtained after reaction; thirdly, the silicon quantum dot solution obtained in the second step is mixed with an organic solvent, centrifugation is conducted, supernate is removed, drying is conducted, and solid silicon quantum dots are obtained, wherein the reaction agent is a mixture composed of two or more of citric acid, sodium sulfite, sodium borohydride, sodium citrate, ascorbic acid, urea, thiourea, hydrazine hydrate, L-cysteine, bovine serum albumin or modified ovine serum albumin.

Silicon quantum dot aqueous phase preparation method

The invention discloses a preparation method for a chiral CdSe quantum dot. The preparation method comprises the following steps: (1) preparing a sodium hydrogen selenide aqueous solution, and carrying out preservation at 4 DEG C or below; (2) dissolving cadmium chloride and a ligand in water, adjusting a pH value of an obtained mixture to 7 to 12 so as to obtain a precursor solution, and subjecting the precursor solution to stirring in an ice bath under the protection of inert gas, wherein the ligand is a combination of two or more selected from the group consisting of penicillamine, cysteine, N-acetyl-cysteine, glutathione or N-isobutyryl-cysteine; and (3) injecting the sodium hydrogen selenide aqueous solution prepared in the step (1) into the precursor solution obtained in the step (2), carrying out heating to 70 to 220 DEG C for 10 to 120 min, and carrying out cooling to a room temperature so as to obtain a chiral CdSe quantum dot solution. The quantum dot provided by the invention can be extensively applied to the fields of enantiomer recognition and separation, nanometer equipment, chiral sensors, asymmetric catalysis, etc.

Ma Shiyao

Papers

Method for preparing high-yield fluorescent silicon quantum dots by virtue of hydrothermal method or microwave method

Silicon quantum dot aqueous phase preparation method

Preparation method for chiral CdSe quantum dot