Method for preparing graphene quantum dots

A technology of graphene quantum dots and graphene sheets, applied in graphene, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as limiting electronic and optoelectronic applications, and achieve water solubility and good application Foreground, high purity effect

Active Publication Date: 2012-12-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, graphene is a zero-bandgap semiconductor, whic

Method used

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  • Method for preparing graphene quantum dots
  • Method for preparing graphene quantum dots
  • Method for preparing graphene quantum dots

Examples

Experimental program
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Embodiment 1

[0031] Synthesis of graphite oxide:

[0032] At room temperature, add 3 grams of 98wt% graphite powder into 69 milliliters of 95-98wt% concentrated sulfuric acid under stirring, then add 1.5 grams of 99wt% sodium nitrate and 9 grams of 99.5wt% potassium permanganate During this process, the temperature of the mixed solution is controlled by an ice bath to not exceed 20°C; then the ice bath is removed, the temperature of the above mixed solution is controlled by a water bath at 30-35°C, and kept at this temperature for 2 hours; then removed Water bath heat preservation equipment, slowly add 137 ml of deionized water under the condition of stirring, the temperature of the system is raised to 90-98 ° C, and keep the temperature for 15 minutes; then dilute the above mixed solution to 420 ml with warm deionized water; then add to the above Add 11 milliliters of 30 wt% hydrogen peroxide to the mixed system, and filter while hot; use 36 wt% hydrochloric acid and water in a dilute hyd...

Embodiment 2

[0040] Synthesis of graphite oxide:

[0041] At room temperature, add 3 grams of 98wt% graphite powder into 69 milliliters of 95-98wt% concentrated sulfuric acid under stirring, then add 1.5 grams of 99wt% sodium nitrate and 9 grams of 99.5wt% potassium permanganate During this process, the temperature of the mixed solution is controlled by an ice bath to not exceed 20°C; then the ice bath is removed, the temperature of the above mixed solution is controlled by a water bath at 30-35°C, and kept at this temperature for 2 hours; then removed Water bath heat preservation equipment, slowly add 137 ml of deionized water under the condition of stirring, the temperature of the system is raised to 90-98 ° C, and keep the temperature for 15 minutes; then dilute the above mixed solution to 420 ml with warm deionized water; then add to the above Add 11 milliliters of 30 wt% hydrogen peroxide to the mixed system, and filter while hot; use 36 wt% hydrochloric acid and water in a dilute hyd...

Embodiment 3

[0049] Synthesis of graphite oxide:

[0050] At room temperature, add 3 grams of 98wt% graphite powder into 69 milliliters of 95-98wt% concentrated sulfuric acid under stirring, then add 1.5 grams of 99wt% sodium nitrate and 9 grams of 99.5wt% potassium permanganate During this process, the temperature of the mixed solution is controlled by an ice bath to not exceed 20°C; then the ice bath is removed, the temperature of the above mixed solution is controlled by a water bath at 30-35°C, and kept at this temperature for 2 hours; then removed Water bath heat preservation equipment, slowly add 137 ml of deionized water under the condition of stirring, the temperature of the system is raised to 90-98 ° C, and keep the temperature for 15 minutes; then dilute the above mixed solution to 420 ml with warm deionized water; then add to the above Add 11 milliliters of 30 wt% hydrogen peroxide to the mixed system, and filter while hot; use 36 wt% hydrochloric acid and water in a dilute hyd...

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Abstract

The invention discloses a method for preparing graphene quantum dots, which belongs to the technical field of nano-material preparation. The method for preparing grapheme quantum dots comprises the following steps: firstly, utilizing graphite oxide to prepare graphene slices, and dissolving 50mg of graphene slices, 0-30mL of concentrated sulfuric acid, 10-40mL of concentrated nitric acid and the balance of de-ionized water for supplementing to 40mL into a dispersing system with 40mL; filtrating the abovementioned dispersing system, dispersing the solid into the de-ionized water again, adjusting the pH value to 8 with a sodium hydroxide solution, processing for 3 min in a microwave reaction kettle, naturally cooling, filtering with a filter membrane, collecting filtrate and dialyzing the filtrate in a dialysis bag for three days; and drying the dialyzed products to obtain the graphene quantum dots. The method provided by the invention is convenient in synthetic process and high in efficiency, and the obtained graphene quantum dots are high in purity, small in particle size, and strong in fluorescent property, and has monodispersity and water solubility, so that the graphene quantum dots are good in application prospect in the aspects of bioluminescent marks and solar cells.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to a method for preparing graphene quantum dots. Background technique [0002] Graphene has attracted extensive attention due to its numerous and promising applications in the field of nanotechnology due to its unique physical properties. However, graphene is a zero-bandgap semiconductor, which limits its electronic and optoelectronic applications. Since there is no energy band gap, pure graphene (pristin graphene) cannot observe fluorescence. However, when the size of graphene quantum dots is smaller than 100 nm, the graphene quantum dots generate an energy band gap due to the quantum confinement effect and edge effect. If the size of graphene quantum dots can be reduced to less than 10 nanometers, the two effects of quantum confinement effect and edge effect will be more significant, and new physical properties will also be produced. Due to the biocompatibility...

Claims

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Application Information

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IPC IPC(8): C01B31/04B82Y30/00C01B32/184
Inventor 曹化强殷捷夫
Owner TSINGHUA UNIV
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