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Nitrogen-sulfur co-doped cellulose-based fluorescent carbon dots and application thereof

A cellulosic and fluorescent carbon dot technology, applied in the field of nanomaterials, can solve the problems of expensive precursor raw materials, complicated and time-consuming operation process, expensive equipment, etc., and achieve the effects of good water solubility, stable fluorescence and low cost of raw materials

Pending Publication Date: 2021-06-25
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The methods mentioned above basically have cost defects, such as expensive equipment, complicated and time-consuming operation process, and expensive precursor raw materials. There is an urgent need for a green preparation method that can successfully overcome these disadvantages

Method used

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  • Nitrogen-sulfur co-doped cellulose-based fluorescent carbon dots and application thereof
  • Nitrogen-sulfur co-doped cellulose-based fluorescent carbon dots and application thereof
  • Nitrogen-sulfur co-doped cellulose-based fluorescent carbon dots and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045]This example provides a nitrogen-sulfur co-doped cellulose-based fluorescent carbon dot, which is prepared by the following method:

[0046] Put 0.5g of cellulose powder, 0.15g of sodium thiosulfate powder and 0.5mL of ethylenediamine solution (analytical grade) into a polytetrafluoroethylene reactor, while adding 10ml of ultrapure water as a solvent. Put the reaction kettle in a constant temperature oven at 180°C, react for 72 hours, centrifuge to obtain a brown carbon dot reaction solution, dialyze the reaction solution with a 500Da dialysis tube for 72 hours, and then freeze the dialyzed solution with a lyophilizer to finally obtain nitrogen Sulfur-co-doped cellulose-based fluorescent carbon dots.

[0047] In order to further illustrate the technical effects of the present invention, the applicant also tested the nanoparticle size, fluorescent properties and cytotoxicity of the nitrogen-sulfur co-doped cellulose-based fluorescent carbon dots obtained in Example 1, spe...

Embodiment 2

[0055] This example provides a nitrogen-sulfur co-doped cellulose-based fluorescent carbon dot, which is prepared by the following method:

[0056] Put 2g of cellulose powder, 3g of sodium thiosulfate powder and 0.7mL of ethylenediamine solution (analytical grade) into a polytetrafluoroethylene reactor, while adding 40ml of ultrapure water as a solvent. Put the reaction kettle in a constant temperature oven at 200°C, react for 80 hours, and centrifuge to obtain a brown carbon dot reaction solution. Dialyze the reaction solution with a 800Da dialysis tube for 82 hours, and then freeze-dry the dialyzed solution to finally obtain nitrogen-sulfur co-doped Cellulose-based fluorescent carbon dot material.

Embodiment 3

[0058] This example provides a nitrogen-sulfur co-doped cellulose-based fluorescent carbon dot, which is prepared by the following method:

[0059] Put 4g of cellulose powder, 3.5g of sodium thiosulfate powder and 0.8mL of ethylenediamine solution (analytical grade) into a polytetrafluoroethylene reactor, and add 60ml of ultrapure water as a solvent. Put the reaction kettle in a constant temperature oven at 150°C, react for 70 hours, and centrifuge to obtain a brown carbon dot reaction solution. Dialyze the reaction solution with a 900Da dialysis tube for 80 hours, and then freeze-dry the dialyzed solution to finally obtain nitrogen-sulfur co-doped Cellulose-based fluorescent carbon dot material.

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Abstract

The invention discloses nitrogen-sulfur co-doped biomass-based fluorescent carbon dots which are prepared from the following raw materials in parts by weight: 0.5-4 parts of a biological carbon source, 0.1-4 parts of a nitrogen source and 0.1-4 parts of a sulfur source by adopting a hydrothermal method in one step. The problem that existing fluorescent carbon dots are harsh in preparation conditions and low in fluorescent quantum yield is solved, the operation is easy, the raw material cost is low, and the prepared nitrogen-sulfur co-doped cellulose-based fluorescent carbon dots are high in fluorescent quantum yield, stable in fluorescence performance, good in biocompatibility and low in toxicity, and the nitrogen-sulfur co-doped cellulose-based fluorescent carbon dots can be applied to the fields of biological imaging and iron ion detection.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, and more specifically relates to a nitrogen-sulfur co-doped cellulose-based fluorescent carbon dot and its application. Background technique [0002] Carbon quantum dots, referred to as carbon dots (CDs), are new fluorescent carbon nanomaterials with a particle size of less than 10nm. Since Xu et al. accidentally discovered carbon dots in 2004 when they used electrophoresis to separate single-armed carbon nanotubes, they have gradually become a new star in the family of carbon-based materials. Compared with traditional semiconductor quantum dots, it has the advantages of excellent water solubility, low toxicity, biosolubility, stable fluorescence and adjustable fluorescence. This makes carbon dots have potential applications in many aspects, such as bioimaging, biosensing, drug release, optoelectronic devices and fluorescent printing, etc., and has also attracted the interest of a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09K11/02B82Y20/00B82Y30/00B82Y40/00G01N21/64
CPCC09K11/65C09K11/025B82Y20/00B82Y30/00B82Y40/00G01N21/6428G01N21/643G01N21/6458G01N2021/6417
Inventor 高俊阔杨海明沈培莲姚菊明
Owner ZHEJIANG SCI-TECH UNIV
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