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Preparation method of diphenyl azide phosphate modified graphene quantum dots

A technology of diphenyl phosphate azide and graphene quantum dots, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of inability to ensure the photoelectric performance of graphene, poor purity of graphene quantum dots, and stable products Insufficient performance and other problems, to achieve the effect of high quantum yield, simple operation and good stability

Active Publication Date: 2020-04-03
NINGBO UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the quantum yield of graphene quantum dots without surface passivation or doping is very low, but doping tends to produce more intermediate products in the preparation process of graphene quantum dots. On the one hand, it cannot ensure the improvement of graphene photoelectric performance. On the one hand, the purity of the final graphene quantum dots is not good, and the product stability is not enough

Method used

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  • Preparation method of diphenyl azide phosphate modified graphene quantum dots
  • Preparation method of diphenyl azide phosphate modified graphene quantum dots
  • Preparation method of diphenyl azide phosphate modified graphene quantum dots

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Embodiment 1

[0022] This embodiment provides a method for preparing graphene quantum dots modified with diphenyl azide phosphate, which includes the following steps:

[0023] 1. Dissolve diphenyl azide phosphate and glucose into the solvent to form the first precursor solution; wherein the diphenyl azide phosphate and glucose can be dissolved in each other first, and then added to the solvent, or added in order In the solvent, at room temperature, the diphenyl azide phosphate and glucose will not react in the solvent, so the first precursor solution can be stirred evenly by means of magnetic force or ultrasound;

[0024] 2. Adjust the pH of the first precursor solution to acidity to form a second precursor solution; the adjustment method is by adding one or more of dilute hydrochloric acid, dilute sulfuric acid or dilute phosphoric acid to the first precursor solution to Adjust the pH to 3, the mass fraction of dilute hydrochloric acid, dilute sulfuric acid or dilute phosphoric acid is 20-50%; ...

Embodiment 2

[0035] The difference between this embodiment and embodiment 1 is that, in this embodiment, 50mmol of diphenyl azide phosphate and 10mmol of glucose are dissolved in 50ml of ethanol, and the solution is dissolved under ultrasound for 10 minutes to form a first precursor solution, wherein the first precursor solution is The molar concentration of diphenyl azide phosphate is 1 mmol / ml, the molar concentration of glucose is 0.2 mmol / ml, and the molar concentration of diphenyl azide phosphate is five times the molar concentration of glucose.

[0036] See image 3 , The solid powder of graphene quantum dots modified with diphenyl azide phosphate was tested with a fluorescence spectrophotometer, the excitation wavelength peak position was 333nm, the excitation wavelength was 330-410nm, the emission wavelength peak position of the solid powder was 433nm, emission The wavelength is 430-510nm.

[0037] If the solid powder is dissolved in water to form an aqueous solution, and the ultraviol...

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Abstract

The invention discloses a preparation method of diphenyl azide phosphate modified graphene quantum dots. The method comprises the following steps: dissolving diphenyl azide phosphate and glucose intoa solvent to form a first precursor solution, adjusting the pH value of the first precursor solution to be acidic to form a second precursor solution, carrying out hydrothermal reaction on the secondprecursor solution, filtering and dialyzing a hydrothermal product to obtain a filtrate, and drying the filtrate to form the azido-modified graphene quantum dots. Azido is a group which is easy to accept electrons and strong in negative charge bearing capacity; in the hydrothermal reaction process, the azido group can effectively enable diphenyl azide phosphate to react with glucose to form the diphenyl azide phosphate modified graphene quantum dots, meanwhile, formation of an intermediate product in the hydrothermal reaction can be inhibited in an acid environment, and the hydrothermal reaction temperature is controlled to adjust the particle size of the quantum dots. The obtained graphene quantum dots are good in stability, relatively high in quantum yield and relatively high in fluorescence intensity.

Description

【Technical Field】 [0001] The invention relates to a preparation method of azido-modified graphene quantum dots, and belongs to the field of graphene quantum dots. 【Background technique】 [0002] Graphene quantum dots, that is, small fragments (the lateral size is usually less than 20nm) sp 2 The hybrid two-dimensional graphene layer has a wider excitation wavelength range and a narrower emission wavelength range than traditional fluorescent materials, and has the characteristics of low cytotoxicity, low band gap, and adjustable transport characteristics. Compared with graphene, graphene quantum dots can undoubtedly be widely used in biosensing, bioimaging, and biopharmaceutical delivery. However, the quantum yield of graphene quantum dots without surface passivation or doping is very low, but doping tends to produce more intermediate products during the preparation of graphene quantum dots. On the one hand, it cannot ensure the improvement of graphene's optoelectronic performance...

Claims

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Application Information

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IPC IPC(8): C09K11/65B82Y40/00C01B32/184
CPCC09K11/65B82Y40/00C01B32/184C01B2204/20
Inventor 林汶莉汤世伟徐安丽王刚赵云陈达冯小强
Owner NINGBO UNIV
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