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Preparation method of small-size graphene quantum dots

A technology of graphene quantum dots and small size, applied in graphene, chemical instruments and methods, nano-carbon, etc., can solve the problems of large size and poor uniformity of graphene quantum dots

Active Publication Date: 2020-06-16
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the size of the graphene quantum dots produced by the existing preparation method is large and the

Method used

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  • Preparation method of small-size graphene quantum dots

Examples

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Effect test

Embodiment 1

[0022] (1) Weigh 500 mesh graphite and add it into deionized water to prepare an aqueous solution of graphite with a concentration of 3 mg / ml.

[0023] (2) ultrasonically disperse the graphite aqueous solution in ultrasonic equipment for 1 h. The aqueous solution of the sonicated graphite was freeze-dried in a freeze dryer to obtain dried graphite.

[0024] (3) The dried graphite is placed in a vapor deposition furnace in a nitrogen atmosphere, and the temperature is raised to 200° C. within 20 minutes and kept for 1 hour.

[0025] (4) The heat-treated graphite is irradiated with γ-rays in the air, the absorbed dose is 150KGy, and the irradiation dose rate is 2.7KGy / h to obtain the irradiated graphite.

[0026] (5) 360ml of concentrated sulfuric acid and 40ml of concentrated phosphoric acid will be taken, and the two acids will be stirred and mixed evenly. The mixed acid solution was transferred to a beaker of suitable size and placed in a water bath, heated at a constant te...

Embodiment 2

[0032] (1) Weigh 200 mesh graphite and add it to deionized water to prepare an aqueous solution of graphite with a concentration of 3 mg / ml.

[0033] (2) ultrasonically disperse the graphite aqueous solution in ultrasonic equipment for 1 h. The aqueous solution of the sonicated graphite was freeze-dried in a freeze dryer to obtain dried graphite.

[0034] (3) The dried graphite was placed in a vapor deposition furnace in a nitrogen atmosphere, and the temperature was raised to 250° C. within 30 minutes and kept for 1 hour.

[0035] (4) The heat-treated graphite is irradiated with γ-rays in the air, the absorbed dose is 150KGy, and the irradiation dose rate is 2.7KGy / h to obtain the irradiated graphite.

[0036] (5) 360ml of concentrated sulfuric acid and 40ml of concentrated phosphoric acid will be taken, and the two acids will be stirred and mixed evenly. The mixed acid solution was transferred to a beaker of suitable size and placed in a water bath, heated at a constant te...

Embodiment 3

[0042] (1) Weigh 500 mesh graphite and add it to deionized water to prepare an aqueous solution of graphite with a concentration of 5 mg / ml.

[0043] (2) ultrasonically disperse the graphite aqueous solution in ultrasonic equipment for 1 h. The aqueous solution of the sonicated graphite was freeze-dried in a freeze dryer to obtain dried graphite.

[0044] (3) The dried graphite is placed in a vapor deposition furnace in an argon atmosphere, and the temperature is raised to 270° C. within 30 minutes and kept for 1 hour.

[0045] (4) The heat-treated graphite is irradiated with γ-rays in the air, the absorbed dose is 150KGy, and the irradiation dose rate is 2.7KGy / h to obtain the irradiated graphite.

[0046] (5) 180ml of concentrated sulfuric acid and 20ml of concentrated phosphoric acid will be taken, and the two acids will be stirred and mixed evenly. The mixed acid solution was transferred to a beaker of suitable size and placed in a water bath, heated at a constant temper...

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Abstract

The invention discloses a preparation method of small-size graphene quantum dots, which successfully prepares the small-size graphene quantum dots by introducing gamma ray irradiation into the preparation process of the graphene quantum dots. The specific preparation method comprises the following steps: 1, weighing graphite and adding the graphite into deionized water; 2, ultrasonically treatingthe aqueous solution of graphite and freeze-drying the graphite; 3, carrying out heat treatment on the dried graphite; 4, irradiating the graphite subjected to heat treatment; 5, measuring and mixingconcentrated sulfuric acid and concentrated phosphoric acid in proportion, weighing irradiated graphite and potassium permanganate in proportion, adding the mixed acid, and then heating for enough time to obtain graphite oxide; 6, cleaning the graphite oxide solution, carrying out ultrasonic treatment, and drying to obtain a graphene oxide solid; 7, taking out a N, N-dimethylformamide solution andthe graphene oxide solid, mixing in proportion, and carrying out ultrasonic treatment; 8, putting the solution subjected to ultrasonic treatment into a reaction kettle, and heating for a certain time; and 9, filtering out the black precipitate to obtain a brown suspension, thereby obtaining a DMF solution of the small-size graphene quantum dots.

Description

technical field [0001] The invention belongs to the technical field of graphene quantum dot preparation, in particular to a preparation method of small-sized graphene quantum dots. Background technique [0002] Graphene quantum dots (GODs) are a new member of the graphene family with less than 10 graphene sheets and a lateral dimension of no more than 100 nm. As a new member of the carbon material family, in addition to having excellent properties comparable to graphene, graphene quantum dots possess a series of new features that graphene does not possess due to its unique quantum confinement effect and edge effect. At the same time, the low toxicity, superior solubility, stable fluorescence and chemical inertness of graphene quantum dots make it have broad application prospects in the fields of bioimaging, optoelectronic devices, sensors and detectors. [0003] At present, the production methods of graphene quantum dots are mainly divided into two categories, top-down and ...

Claims

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Application Information

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IPC IPC(8): C01B32/184C09K11/65
CPCC01B32/184C09K11/65
Inventor 徐志伟马天帅李楠刘梁森钱晓明王维
Owner TIANJIN POLYTECHNIC UNIV
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