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Preparation method of carbon nanoparticle with controllable photoluminescence

A technology of carbon nanoparticles and photoluminescence, which is applied in the field of nanomaterials, can solve the problems of low quantum yield, single luminescence of photoluminescent materials, and easy photobleaching, etc., and achieve the effect of good dispersion

Inactive Publication Date: 2011-09-07
SUZHOU FANGSHENG OPTOELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These photoluminescent materials have a single light emission, and they also encounter some difficulties in preparation and application, such as the dye itself is easy to polymerize, easy to photobleach, and the quantum yield is relatively low, and the new II-IV quantum dots are toxic.

Method used

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  • Preparation method of carbon nanoparticle with controllable photoluminescence
  • Preparation method of carbon nanoparticle with controllable photoluminescence
  • Preparation method of carbon nanoparticle with controllable photoluminescence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In the preparation method of the present invention, 1g of glucose and 0.1g of sodium hydroxide are added to 15mL of deionized water, fully dissolved and stirred evenly, and prepared into a solution, added to a 20mL polytetrafluoroethylene jar, and then put into Stainless steel water heating kettle. The reaction was heated in an electronic oven at 160°C for 4 hours. The solution obtained after the reaction was separated by centrifugation, and the obtained precipitate was washed with water and ethanol three times each, then recrystallized to remove salt, put in a vacuum drying oven, and dried at 60°C for four hours to obtain a luminosity controllable Luminescent carbon nanoparticles. As shown in Figure 2, the obtained carbon nanoparticles have uniform morphology. Fluorescent properties were tested by fluorescence spectrophotometer, Figure 3a It is the ultraviolet-visible excitation-visible emission fluorescence spectrograms with excitation wavelengths of 500nm, 450nm,...

Embodiment 2

[0032] According to the method of the above-mentioned Example 1, only the type of the oxidation additive is changed, the carbohydrate is still glucose, and the oxidation additive is hydrochloric acid, and carbon nanoparticles with adjustable photoluminescent properties are prepared. Fluorescent properties were tested by fluorescence spectrophotometer, Figure 3b It is the ultraviolet-visible excitation-visible emission fluorescence spectrograms with excitation wavelengths of 500nm, 450nm, 400nm, 350nm, and 300nm, in which curves A, B, C, D, and E represent fluorescence at excitation wavelengths of 500nm, 450nm, 400nm, 350nm, and 300nm Spectrum; Figure 4b are the up-converted fluorescence spectra when the excitation wavelengths are 800nm, 850nm, and 900nm respectively, where curves F, G, and H represent the fluorescence spectra when the excitation wavelengths are 900nm, 850nm, and 800nm. It can be seen from the above spectra that the prepared carbon nanoparticles have ultravi...

Embodiment 3

[0034] According to the method of the above-mentioned Example 1, only the type of carbohydrate is changed, the carbohydrate is sucrose, and the oxidation additive is still sodium hydroxide, and carbon nanoparticles with tunable photoluminescent properties are prepared. Fluorescent properties were tested by fluorescence spectrophotometer, Figure 3c It is the ultraviolet-visible excitation-visible emission fluorescence spectrograms with excitation wavelengths of 500nm, 450nm, 400nm, 350nm, and 300nm, in which curves A, B, C, D, and E represent fluorescence at excitation wavelengths of 500nm, 450nm, 400nm, 350nm, and 300nm Spectrum; Figure 4c are the up-conversion fluorescence spectrum diagrams when the excitation wavelengths are 800nm, 850nm, and 900nm respectively, wherein curves F, G, and H represent the fluorescence spectrum diagrams when the excitation wavelengths are 900nm, 850nm, and 800nm; Figure 5a It is the near-infrared excitation and near-infrared emission fluores...

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Abstract

The invention discloses a preparation method of carbon nanoparticles with controllable photoluminescence. In the method, the hydrothermal process is adopted; and the method comprises the following steps: preparing a solution composed of a carbohydrate which is used as a carbon source and an oxidation additive, feeding the solution to a hydrothermal reactor and heating to allow reactions; carrying out centrifugal separation on the reaction product, washing with water for three times and washing with ethanol for three times; removing salts; and drying to obtain carbon nanoparticles. The method provided by the invention is simple and low in cost. The prepared carbon nanoparticles have good dispersibility, contain abundant surface oxygen-containing groups (such as hydroxyl groups and carboxyl groups) which make surface functionalization or modification of carbon nanoparticles easier, and are excellent in fluorescence properties of ultraviolet-visible excited visible emission fluorescence properties, up-conversion fluorescence properties and near-infrared excitated near-infrared emission properties. The emission spectrum of carbon nanoparticles varies with the change in excitation wavelength.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to a method for preparing carbon nanometer particles with adjustable photoluminescent properties. Background technique [0002] Materials with optical properties have received increasing attention in fields such as optical materials, especially in the field of biotechnology. Among them, fluorescent labeling technology has been greatly developed in many application fields such as biological monitoring, sensing, and imaging. At present, the main photoluminescent materials are concentrated on organic dyes, rare earth doping, II-IV quantum dots, etc. These photoluminescent materials have a single luminescence, and they also encounter some difficulties in preparation and application, such as the dye itself is easy to polymerize, easy to photobleach, and the quantum yield is relatively low, and the new II-IV quantum dots are toxic. Therefore, the synthesis of fluorescent materials wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y40/00
Inventor 康振辉何小蝶刘阳李海涛黄慧
Owner SUZHOU FANGSHENG OPTOELECTRONICS CO LTD
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