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Synthetic method of nitrogen and sulfur co-doped cellulosic fluorescent carbon dots

A cellulosic and synthetic method technology, applied in the direction of color-changing fluorescent materials, chemical instruments and methods, etc., can solve the problems of expensive precursor raw materials, complicated and time-consuming operation process, expensive equipment, etc., and achieve good water solubility, stable fluorescence, raw material low cost effect

Inactive Publication Date: 2017-04-26
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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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  • Synthetic method of nitrogen and sulfur co-doped cellulosic fluorescent carbon dots
  • Synthetic method of nitrogen and sulfur co-doped cellulosic fluorescent carbon dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put 0.5g of cellulose powder, 0.15g of sodium thiosulfate powder and 0.5mL of ethylenediamine solution into a polytetrafluoroethylene reaction kettle, and simultaneously add 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-doped cellulose-based fluorescent carbon dots (a).

[0025] The above-mentioned raw materials are commercially available analytically pure raw materials, and the cellulose can be any common cellulose.

Embodiment 2

[0027] Put 2g of cellulose powder, 3g of sodium thiosulfate powder and 0.7mL of ethylenediamine solution into a polytetrafluoroethylene reactor, and add 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 (b).

Embodiment 3

[0029] Put 4g of cellulose powder, 3.5g of sodium thiosulfate powder and 0.8mL of ethylenediamine solution into a polytetrafluoroethylene reaction kettle, and simultaneously 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 (c).

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Abstract

The invention discloses a preparation method and application of nitrogen and sulfur co-doped cellulosic fluorescent carbon dots and belongs to the field of nanometer material science and application. The nitrogen and phosphorus co-doped carbon dots are prepared by adopting cellulose as a carbon source, adopting sodium thiosulfate and ethylenediamine as doping agents, adopting ultrapure water as a reaction agent and through a hydrothermal method in a one-step mode, brown carbon dot reaction liquid is obtained, centrifugal treatment is conducted on the reaction liquid, supernate is taken, and precipitate is removed. The supernate is dialyzed and purified by selecting a dialysis tube with the molecular weight cutoff of 500-1000 Da, and freeze drying is performed to obtain a carbon dot solid. The preparation method is simple in operation, the raw materials are cheap and easy to obtain, and the obtained carbon dots have high fluorescence quantum yield and are good in water solubility and stable in fluorescence.

Description

technical field [0001] The invention belongs to the field of nanometer material science, and in particular relates to a synthesis method and application of nitrogen and sulfur co-doped cellulose-based fluorescent carbon dots. Background technique [0002] Carbon quantum dots, referred to as carbon dots (CDs), are a new type of carbon nanomaterials with a quasi-spherical structure and stable fluorescence properties less than 10nm in size. Compared with traditional semiconductor quantum dots and organic dyes, CDs are more and more popular due to their rich physical and chemical properties such as low toxicity, good dispersibility, strong chemical inertness, simple functionalization, good photobleaching resistance, and excellent biocompatibility. received the attention of researchers. CDs can be well dispersed in water and can modify various types of organic and inorganic materials. Notably, CDs also possess upconversion photoluminescence properties depending on their excitat...

Claims

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Application Information

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IPC IPC(8): C09K9/00
CPCC09K9/00
Inventor 高俊阔姚菊明沈培莲
Owner ZHEJIANG SCI-TECH UNIV
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