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Graphene quantum dot preparation method

A graphene quantum dot, a certain amount of technology, applied in the field of nanomaterials, can solve problems such as being unsuitable for mass production and application, high cost, complicated process, etc., to achieve small particle size, high purity and yield, and simple synthesis process. Effect

Inactive Publication Date: 2014-04-23
YANCHENG ZENGCAI SCI & TECH +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, these methods for preparing graphene quantum dots have disadvantages such as cumbersome process, high cost, and low yield, and are not suitable for mass production and application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Preparation of green fluorescent graphene oxide quantum dots

[0029] Add 1 g of graphite oxide into the beaker, slowly add 50 ml of concentrated sulfuric acid and 5.0 g of potassium permanganate, first stir in an ice bath for one hour, then transfer to a medium temperature of 40 °C for 2 hours, and then transfer to 90 °C The high temperature stage reacted for half an hour, stopped the reaction, and added 120 mL of water to dilute the reaction. Then add 13 mL of hydrogen peroxide to react excess potassium permanganate to obtain a light yellow transparent solution. Then add excess NaOH to make the pH 8, and then add a small amount of dilute HCl solution to make the pH neutral. The yellow solution was obtained by filtering with a 0.22 micron polycarbonate membrane, and the solution was dialyzed in a 3000-8000 Da dialysis bag for 3 days to obtain green light graphene oxide quantum dots. Among them, the size of graphene oxide quantum dots is 3-7 nm (see figure 2 b-...

Embodiment 2

[0033] 1. Preparation of green fluorescent graphene oxide quantum dots

[0034] According to the method in Example 1, graphite oxide was replaced by graphene to prepare green fluorescent graphene oxide quantum dots.

[0035] 2. Preparation of blue fluorescent graphene quantum dots

[0036] Weigh 0.4 g of green graphene oxide quantum dots and add 80 mL of water to a 200 mL flask, then ultrasonically disperse for half an hour, then add 1.2 mL of hydrazine hydrate solution, and stir and react at room temperature for 10 hours. After the reaction, add 0.1 mol / L dilute hydrochloric acid to make the pH of the solution 6, put the solution into a 3000-8000 Da dialysis bag and dialyze for 7 days to obtain blue fluorescent graphene quantum dots. The size of the blue fluorescent graphene quantum dots obtained after reduction is about 2-6 nm, the thickness is about 1-5 nm, and the yield is 22.7%.

Embodiment 3

[0038] 1. Preparation of green fluorescent graphene oxide quantum dots

[0039] According to the method in Example 1, graphite oxide is replaced by graphene nanobelts, the consumption of graphene nanobelts is 0.68g, the consumption of sulfuric acid is 73mL, the consumption of potassium permanganate is 5.6 g, using polytetrafluoroethylene micro The pore membrane filters the solution to prepare green fluorescent graphene oxide quantum dots.

[0040] 2. Preparation of blue fluorescent graphene quantum dots

[0041] Weigh 0.1 g of green graphene oxide quantum dots and add 40 mL of water to a 100 mL flask, then ultrasonically disperse for half an hour, then add 2 g of NaBH 4 , stirred and reacted at room temperature for 8 hours. After the reaction was completed, 0.1 mol / L dilute hydrochloric acid was added to make the pH of the solution 7, and the solution was placed in a 3000-8000 Da dialysis bag for dialysis for 7 days to obtain blue fluorescent graphene quantum dots. Its size...

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Abstract

The present invention discloses a graphene quantum dot preparation method, belongs to the technical field of nanometer material preparation, and particularly relates to a graphene quantum dot preparation method. The technical scheme comprises that: a carbon material being subjected to deep oxidation is cut into graphene oxide nano-sheets, C=C bonds and C-C bonds of the graphene oxide are broken to prepare green fluorescence graphene oxide quantum dots, and a reduction or high temperature annealing method is further adopted to prepare the blue fluorescence graphene quantum dots. According to the present invention, the operations are simple, the raw materials are easy to obtain, and the prepared graphene quantum dots have characteristics of excellent monodispersity, good water solubility and strong fluorescence, and have potential application prospects in the fields of supercapacitors, lithium batteries, biological imaging, solar cells, field-effect transistors, OLEDs and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a preparation method of graphene quantum dots. Background technique [0002] Graphene has a wide range of applications in the field of nanotechnology due to its unique physical properties, and has also attracted widespread attention in the academic community. However, graphene is a semiconductor with zero energy bandgap, and pure graphene oxide or graphene without energy bandgap cannot observe fluorescence properties, which limits its application in the fields of electronics and optoelectronics, but the size of graphene Confined below 100 nanometers, this type of graphene nanosheet is called graphene quantum dots, which have quantum confinement effect and edge effect, so that graphene quantum dots have an energy band gap. If the size of graphene quantum can be further reduced to less than 10 nanometers, its quantum confinement effect and edge effect will be sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C09K11/65B82Y20/00C01B32/19
Inventor 闵永刚范天举刘屹东张乐乐童宋照宋建军
Owner YANCHENG ZENGCAI SCI & TECH
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