Method for preparing graphene quantum dots

A technology of graphene quantum dots and gas phase, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of long time-consuming, inability to obtain graphene quantum dot powder in one step, many processes, etc., and achieve the effect of cheap raw materials

CN107934944AActive Publication Date: 2018-04-20DALIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2018-04-20

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Abstract

The invention belongs to the technical field of fluorescent nanomaterial synthesis, and discloses a method for preparing graphene quantum dots. The method comprises the concrete steps that benzoic acid is used as a carbon source and is flatly spread in a gas-phase detonation tube; vacuumizing is performed after the gas-phase detonation tube is sealed; meanwhile, the gas-phase detonation tube is heated to be higher than 100 DEG C, so that the benzoic acid is sublimated; hydrogen gas and oxygen gas are respectively introduced into the gas-phase detonation tube; gas in the gas-phase detonation tube is detonated; the heating on the gas-phase detonation tube is stopped, so that the gas-phase detonation tube is cooled to be lower than 60 DEG C; the gas-phase detonation tube is opened for collecting black products; the black products are graphene quantum dot powder. The method is simple and efficient; the graphene quantum dots can be fast synthetized in large scales.
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Description

technical field

[0001] The invention belongs to the technical field of fluorescent nanomaterial synthesis, and relates to a method for preparing graphene quantum dots. Background technique

[0002] Graphene quantum dots are quasi-zero-dimensional nanomaterials, and the movement of electrons in them is restricted in all directions, so the quantum confinement effect is particularly significant and has many unique properties. Due to their superior properties, such as photobleaching resistance, low toxicity, good biocompatibility, easy modification, chemical inertness, broader excitation spectrum, and tunable bandgap, etc., they have attracted considerable attention. Graphene quantum dots have been used in fluorescent probes, bioimaging, biomedical and optoelectronic devices.

[0003] At present, the preparation methods of graphene quantum dots are mainly divided into two methods: top-down and bottom-up. Document 1 (CN104229790A) discloses a method for preparing graphene quant...

Examples

Embodiment 1

[0027] Using benzoic acid as a carbon source, the method for rapidly preparing graphene quantum dots by a gas phase detonation method comprises the following steps:

[0028] Step 1, taking benzoic acid as a carbon source, weighing 4g of benzoic acid, and spreading it in the gas phase detonation tube;

[0029] Step 2, vacuumize the gas-phase detonation tube after airtight, and simultaneously heat the gas-phase detonation tube to 110°C to sublimate benzoic acid (benzoic acid sublimes quickly at 100°C), estimate the benzene according to the barometer that comes with the gas-phase detonation tube Amount of formic acid sublimation;

[0030] Step 3: Charge hydrogen and oxygen into the gas phase detonation tube respectively, the volume ratio is 1:1, the molar weight charged is 0.13mol, and the pressure value in the gas phase detonation tube is 0.75atm;

[0031] Step 4. Wait for 5 minutes to mix the gas in the gas-phase detonation tube evenly, and detonate the gas in the tube through...