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Preparation method of fluorescent carbon dots

A carbon quantum dot and fluorescence technology, which is applied in the field of preparation of fluorescent materials, can solve the problems of cumbersome preparation methods of semiconductor quantum dots and organic dyes, prone to photobleaching, unfriendly to the environment, etc., and achieves short preparation cycle, low price, and easy operation. handy effect

Inactive Publication Date: 2016-04-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problems of cumbersome preparation methods of existing semiconductor quantum dots and organic dyes, which are expensive, environmentally unfriendly, and prone to photobleaching, and provides a preparation method of fluorescent carbon quantum dots

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  • Preparation method of fluorescent carbon dots
  • Preparation method of fluorescent carbon dots
  • Preparation method of fluorescent carbon dots

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specific Embodiment approach 1

[0015] Specific embodiment one: the preparation method of a kind of fluorescent carbon quantum dot of present embodiment is to carry out according to the following steps:

[0016] 1. Add K to concentrated sulfuric acid with a mass concentration of 95% to 98% under stirring at room temperature 2 FeO 4 and natural flake graphite, the stirring time is 1h to 1.5h to obtain the reaction solution, the reaction solution is centrifuged to obtain liquid and precipitate, the liquid is recovered, the precipitate is centrifugally washed 3 to 5 times, and left to dry to obtain graphite oxide powder; The K 2 FeO 4 The quality of the natural flake graphite and the volume ratio of the vitriol oil that mass concentration is 95%~98% are 1kg:(30~50) L; 1kg: (5~10)L;

[0017] 2. Mix the graphite oxide powder obtained in step 1 and concentrated nitric acid with a concentration of 65% to 68% into a microwave reactor and carry out microwave hydrothermal reaction at a temperature of 80°C to 150°C...

specific Embodiment approach 2

[0018] Specific embodiment two: the difference between this embodiment and specific embodiment one is: K described in step one 2 FeO 4 The volume ratio of the mass of concentrated sulfuric acid with a mass concentration of 95% to 98% is 1kg:40L. Others are the same as the first embodiment.

specific Embodiment approach 3

[0019] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the mass of the natural flake graphite described in step one and the concentrated sulfuric acid whose mass concentration is 95%~98% have a volume ratio of 6kg:40L. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a preparation method of fluorescent carbon quantum dots, belongs to the technical field of preparation of nanomaterials, particularly relates to a preparation method of a fluorescent material, and aims at solving the problems that an existing semiconductor quantum dot and organic dye preparation method is fussy, high in price and unfriendly to environment, and photo-bleaching is easily generated. The method comprises the following steps: (1) with crystalline flake graphite as a raw material, preparing graphite oxide (GOFe) by a K2FeO4 oxidation method; and (2) with graphite oxide powder as the raw material, preparing the carbon quantum dots (CDots) by a microwave hydrothermal method. The method provided by the invention is simple and clear in synthetic process, high in efficiency and short in period; the obtained carbon quantum dots are high in purity and small in particle sizes and have monodispersity, water solubility and up-conversion and down-conversion fluorescence characteristics; and the prepared fluorescent carbon quantum dots are applied to biological fluorescent labeling and solar hydrogen production.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a method for preparing a fluorescent material. Background technique [0002] Broadly speaking, fluorescent carbon quantum dots are divided into three types: nanodiamonds, fluorescent carbon nanoparticles, and graphene quantum dots. Fluorescent carbon nanoparticles are generally called carbon quantum dots. Carbon quantum dots are the most important kind of fluorescent carbon nanomaterials, also known as carbon dots, carbon nanodots, carbon nanocrystals, and carbon-based dots. They are monodisperse in size below 10nm, and their geometric shape is almost quasi-spherical. An emerging carbon nanofunctional material. In 2004, the Scrivens group accidentally obtained this fluorescent product during the electrophoresis experiment of purifying single-armed carbon nanotubes. In 2006, Sun et al. used laser ablation method to prepare nanoparticles with small p...

Claims

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Application Information

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IPC IPC(8): C01B31/02B82Y30/00C09K11/65
CPCC09K11/65C01P2004/03C01P2004/64
Inventor 于耀光曲帝吉阳旭孙乾
Owner HARBIN INST OF TECH
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