A method for preparing carbon nitride quantum dots comprises the following steps of (1) material preparation, (2) drying and tabletting, (3) heating, (4) separation and (5) drying Sodium chloride crystals are used as a template, the preparing process is simple and low in cost, and the sodium chloride crystals can be easily removed through water dissolution; melamine is used as the raw material, and annular carbon nitride basic structural units exist in melamine molecules, so that the yield of preparing the quantum dots is high, and product size uniformity is good; the prepared quantum dots are high in specific area, good in water solubility and good in dispersity, have strong fluorescent radiation visible under naked eyes, and have wide application prospects in the fields of fluorescence detection, light emitting devices, biomarker and the like

Method for preparing carbon nitride quantum dots

The invention discloses a sulfur-doping graphene quantum dot, a preparation method of the sulfur-doping graphene quantum dot and application of lead ion detection. The preparation method comprises the following steps of dissolving a carbon source compound and a sulfur source compound into water; performing a hydro-thermal reaction under the alkaline condition; preparing the sulfur-doping graphene quantum dot, wherein the carbon source compound is 1,3,6-trinitro pyrene, and the sulfur source compound is soluble sulfide salt. The prepared sulfur-doping graphene quantum dot has excitation wavelength independence; when the excitation wavelength of 410 to 490nm is used for excitation, the fluorescence emission peak position is not changed; lattice lines can be obviously seen in a high resolution transmission electron microscope; the result proves that the sulfur-doping graphene quantum dot synthesized by the invention has single crystal performance; the fluorescence of the substance is quenched by lead ions; the result shows that the obvious selective recognition capability on lead ions is realized; the sulfur-doping graphene quantum dot is hopeful to be used for trace lead ion selective detection.

Sulfur-doping graphene quantum dot, preparation method of sulfur-doping graphene quantum dot and application of silver ion detection

The invention provides a preparation method of a nitrogen-containing oxidative graphene dot capable of giving off fluorescence in three primary colors. The preparation method at least comprises the following steps: providing a material containing graphite, then adding the material into a flask containing concentrated nitric acid, subjecting the flask to a supersonic treatment so as to obtain a black mixed suspension; placing the flash containing the black mixed suspension in an oil bath to heat the flask, carrying out reflux to obtain a reaction liquid; slowly cooling the reaction liquid to the room temperature, then subjecting the cooled reaction liquid to high-speed centrifugation to obtain supernate and precipitate; heating to evaporate the supernate, then drying to obtain a red solid namely the nitrogen-containing oxidative graphene quantum dots. The preparation method is very practical, and is capable of rapidly synthesizing nitrogen-containing oxidative graphene dots from a graphite material obtained from different sources. Moreover, the operation technology is simple, and thus the preparation method is suitable for massive production of nitrogen-containing oxidative graphene quantum dots. The obtained quantum dot has very good uniformity and fluorescence.

Preparation method of nitrogen-containing oxidative graphene quantum dot capable of giving off fluorescence in three primary colors

The invention provides a graphene oxide quantum dot preparation method. The graphene oxide quantum dot preparation method comprises the following steps that citric acid and concentrated sulfuric acid are mixed and undergo a reaction under normal pressure to produce a graphene oxide quantum dot solution. The graphene oxide quantum dot preparation method has the advantages of simple processes, easy acquisition of raw materials, easy realization of technical conditions and short time consumption.

Graphene oxide quantum dot preparation method

The invention discloses a hydrothermal synthesis method of carbon quantum dots from cotton. The method comprises the following steps: weighing certain amounts of cotton and acidic catalyst, adding into a right amount of water, carrying out hydrothermal reaction for some time, filtering the reaction product, and dialyzing to obtain the carbon quantum dots. The method has the advantages of wide carbon sources and simple preparation process, can implement mass production, and is a green method for synthesizing carbon quantum dots.

Hydrothermal synthesis method of carbon quantum dots from cotton

Preparation method of oxygen and chlorine co-doped graphene quantum dots

A preparation method of high-efficient multicolor-fluorescence water-soluble sulfur oxygen-codoped graphene quantum dots relates to the preparation of sulfur oxygen-codoped graphene quantum dots by a one-step synthetic method. The preparation method of high-efficient multicolor-fluorescence water-soluble sulfur oxygen-codoped graphene quantum dots of the invention is characterized in that during preparation, doping and material preparation are combined as a one step; sulfuric acid plays two roles in the reaction, the first one is to provide a doping sulfur source, and the second one is to catalyze intramolecular and intermolecular dehydration of sugar; and the prepared sulfur oxygen-codoped graphene quantum dots have a hexagonal honeycomb structure with good crystallinity. The sulfur oxygen-codoped graphene quantum dots prepared in the invention have the characteristics of water solubility, multicolor luminescence, property stability, large-scale production, low preparation cost, and the like, and thus have great application value in fields of biofluorescence imaging, light emitting diodes, laser diodes, solar cells, detectors, quantum computation, and the like.

Preparation method of high-efficient multicolor-fluorescence water-soluble sulfur oxygen-codoped graphene quantum dot

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Preparation method of oxygen and chlorine co-doped graphene quantum dots

Preparation method of high-efficient multicolor-fluorescence water-soluble sulfur oxygen-codoped graphene quantum dot