Methods of forming graphene (G) by graphite exfoliation, wherein the methods include: providing a graphite sample (10) having atomic layers (11) of carbon; introducing a salt (12) and a solvent (14) into the space (9) between the atomic layers; expanding the space between the atomic layers using organic molecules and ions from the solvent and the salt; and separating the atomic layers using a driving force (45) to form one or more sheets of graphene. The graphene produced by the methods can be used to form solar cells (70), to perform DNA analysis, and for other electrical, optical and biological applications.

Methods of forming graphene by graphite exfoliation

The invention provides a preparation method of graphene. The preparation method comprises the following steps of: cleaning and drying a substrate made of metal material; placing the dried substrate into a reaction chamber; charging protective gas into the reaction chamber; heating the reaction chamber; charging reducing gas; adding graphite oxide powder to the reaction chamber to react; stopping adding the graphite oxide powder as well as stopping charging the reducing gas after the reaction is accomplished; cooling to reach the room temperature at the protective gas atmosphere; and preparing the graphene on the surface of the substrate. According to the preparation method of the graphene, provided by the invention, the graphite oxide is adopted and used as the raw material and is subjected to reduction at high temperature under the reducing gas atmosphere in order to prepare the graphene; and compared with the conventional solution reducing method, the preparation method provided by the invention has the advantages of being short in preparation time, small in floor space for the required equipment, simple, easy and feasible in operation, free from filtering, high in production efficiency, and easy for realization of automatic and industrial production.

Preparation method of graphene

Preparation method of graphene material

The invention relates to a method for removing heavy metal ions in water by using a graphene oxide sheet, which belongs to the technical fields of water purification and environmental protection. In the invention, the graphene oxide sheet is used as an adsorbent of the heavy metal ions, wherein the graphene oxide sheet is of a monatomic layer two-dimensional structure and has a huge specific surface while ensuring no obvious toxicity. In the purification process of the method, the operations are simple without pollution, and the copper ion adsorption efficiency is 10 times that of the active carbon. In the invention, the graphene oxide sheet adsorbing the metal ions can be recovered to the single sheet structure by a centrifugal separation or dialysis method and can be recycled.

Method for removing heavy metal ions in water by using graphene oxide sheet

The invention relates to a graphene-modified lithium iron phosphate positive electrode active material and a method for preparing the same, as well as a lithium-ion secondary cell based on this positive electrode active material. The positive electrode active material is prepared by a method in which graphene or graphene oxide and lithium iron phosphate are dispersed in an aqueous solution, agitated and ultrasonicated to mix homogeneously and for a mixture, dried to obtain a lithium iron phosphate material compounded with graphene or graphene oxide, and annealed at high temperature to obtain finally a graphene-modified lithium iron phosphate positive electrode active material. When compared with conventional modified lithium cells coated with carbon or doped with conductive polymers, the lithium-ion secondary cell based on this positive electrode active material features high cell capacity, good cycling performance of charge and discharge, long life and high cycle stability, and has great utility value.

Lithium iron phosphate positive electrode active material modified by graphene, preparation method and lithium ion secondary battery thereof

The invention relates to a method for simply and innoxiously preparing single-layer graphene, belonging to the chemical field of inorganic field. The technical processes of the invention are as follows: adopting a fixed amount of natural graphite powder; oxidizing the natural graphite powder in a strong oxidizing condition to obtain the graphite oxide; dispersing the obtained graphite oxide in the de-ionized water; then ultrasonically processing for a certain period in an ultrasonic machine to peel the graphite oxide off into single-layer graphite oxide sheet; then dispersing the graphite oxide sheet in the dimethylsulfoxide solution; transferring the mixture solution to a reaction kettle and reacting for 10 to 16 hours in 150 to 200 degrees centigrade; after filtered, obtaining the mass colour product, that is, single-layer grapheme. The invention adopts nontoxic reducing agent, dimethylsulfoxide, so it is good for environment protection. The invention has simple technique, operation convenience, and low manufacturing cost.

Method for simply and innoxiously preparing single-layer graphene

The invention relates to a method for directly preparing graphene/cadmium sulfide quantum dot nano composite material with one step by adopting the graphite oxide as material. The invention provides a simplified technique method, namely the independent preparation step of graphene is saved and skipped, the reduction of graphite oxide or graphene oxide and generation of composite material are finished simultaneously or in one step; and the cadmium sulfide quantum dot has grown on the graphene while the graphite oxide or graphene oxide is reduced to graphene. Therefore, the method can greatly reduce the manufacturing cost of the composite material. The graphene/cadmium sulfide composite material prepared by the method can be used as novel photoelectric conversion material and has higher energy conversion rate.

Method for directly preparing graphene/cadmium sulfide quantum dot nano composite material with one step by adopting graphite oxide as material

The invention relates to a preparation method of graphene/cadmium sulfide quantum dot composite materials, and is applied to photoelectric conversion, belonging to the field of nano inorganic materialand energy chemistry. The method comprises the following steps: taking a certain amount of graphite powder, carrying out oxidization to graphite powder under strong oxidizing condition to obtain oxidized graphite, preparing the oxidized graphite into monolayer oxidized graphite sheet solution with a certain concentration; mixing for 15 hours under the temperature of 95 DEG C in hydrazine hydratereducing agent solution and then obtaining reduced products, namely monolayer graphene black solid; mixing the graphene solid and cadmium acetate dehydrate according to the molar ratio of 1: 1 into amixture, dispersing the mixture into dimethylsulfoxide solution with a certain volume, carrying out ultrasonic processing for a period of time, transferring the obtained mixture into a reaction kettle, annealing for 8 to 16 hours under the temperature of 150 to 200 DEG C and carrying out a plurality of times of cleaning to the product by acetone and alcohol and obtaining the graphene/cadmium sulfide quantum dot composite material. The products obtained by the invention can be used as photoelectric conversion material and have higher energy conversion rate.

Preparation method of graphene/cadmium sulfide quantum dot composite material applied to photoelectric conversion

The invention relates to a method for coating protein by nanometer silicon dioxide, which belongs to the technical field of nanometer inorganic materials and biomacromolecule chemistry. The invention has the technical scheme that the method comprises the following steps: carrying out covalent linkage on a certain amount of 3-aminopropyl triethoxysilane and protein; then, using ammonia water for catalyzing the hydrolysis of covalent linkage products of tetraethoxy silane, the 3-aminopropyl triethoxysilane and the protein in a reverse microemulsion system; and obtaining nanometer silicon dioxide granules coated with green fluorescence protein. The reverse microemulsion system consists of a solution mixed by cyclohexane, polyoxyethylene octyl phenyl ether and hexanol according to a volume ratio of 4/1/1. Products obtained by the invention have high thermal stability and high pH stability, and has the excellent properties such as difficult enzymolysis.

Method for coating protein by nanometer silicon dioxide

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Method for simply and innoxiously preparing single-layer graphene

Method for directly preparing graphene/cadmium sulfide quantum dot nano composite material with one step by adopting graphite oxide as material

Preparation method of graphene/cadmium sulfide quantum dot composite material applied to photoelectric conversion

Method for coating protein by nanometer silicon dioxide