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Red luminescent carbon quantum dot, preparation method and application thereof

A technology of carbon quantum dots and red light emission, applied in the field of red light-emitting carbon quantum dot materials and their preparation, can solve problems such as hindering application, and achieve the effects of low cost, high yield and narrow particle size distribution

Active Publication Date: 2017-03-22
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the reported methods for the detection of Cu in recent years 2+ The emission wavelengths of carbon dots of ions are all in the blue-yellow light region [Adv.Mater.2012, 24, 2037-2041], but these emitted light is easily absorbed by organisms, which greatly hinders its application

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  • Red luminescent carbon quantum dot, preparation method and application thereof
  • Red luminescent carbon quantum dot, preparation method and application thereof
  • Red luminescent carbon quantum dot, preparation method and application thereof

Examples

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example 1

[0023] Example 1: Mix 10mL dimethyl sulfoxide and 10mL dimethylformamide solution, add 1g citric acid and 3g urea, stir well and transfer to a 25mL hydrothermal kettle, then keep at 200°C for 6 hours for solvothermal reaction . The obtained nanoparticles were washed with a mixture of ethyl acetate and petroleum ether, centrifuged, and vacuum-dried at 60° C. to obtain the final product.

[0024] Transmission electron microscopy observations show that the synthesized carbon quantum dots are spherical particles with a size of about 2 to 3 nanometers ( figure 1 ). Raman spectroscopy( figure 2 ) and X-ray photoelectron spectroscopy ( image 3 , 4) show that there are a large number of pyrrole nitrogen-related defect states on the surface of carbon quantum dots. Under the excitation of 550nm yellow light, the carbon quantum dots can emit bright red light, the central wavelength of the emission band is located at 640nm, and the luminous quantum efficiency is 42%. Join Cu 2+ Af...

example 2

[0025] Example 2: Mix 10mL dimethyl sulfoxide and 10mL dimethylformamide solution, add 1g citric acid and 2g urea, stir well and transfer to a 25mL hydrothermal kettle, then keep it at 220°C for 3 hours for solvothermal reaction . The obtained nanoparticles were washed with a mixture of ethyl acetate and petroleum ether, centrifuged, and vacuum-dried at 60° C. to obtain the final product.

[0026] The transmission electron microscope observation shows that the synthesized carbon quantum dots are spherical particles of about 2-3 nanometers. Carbon quantum dots can emit bright red light with a luminous quantum efficiency of 39%. The obtained carbon quantum dots enable highly selective Cu 2+ Ion detection, the highest sensitivity can reach 45nM. By adding the strong chelating agent ethylenediaminetetraacetic acid (EDTA), the Cu 2+ Stripping from carbon quantum dots to realize the recycling of carbon quantum dots.

example 3

[0027] Example 3: Mix 10mL dimethyl sulfoxide and 10mL dimethylformamide solution, add 1g citric acid and 1g urea, stir well and transfer to a 25mL hydrothermal kettle, then keep it at 240°C for 1 hour for solvothermal reaction . The obtained nanoparticles were washed with a mixture of ethyl acetate and petroleum ether, centrifuged, and vacuum-dried at 60° C. to obtain the final product.

[0028] The transmission electron microscope observation shows that the synthesized carbon quantum dots are spherical particles of about 2-3 nanometers. Carbon quantum dots emit bright red light with a quantum efficiency of 35%. The obtained carbon quantum dots enable highly selective Cu 2+ Ion detection, its highest sensitivity can reach 47nM. By adding the strong chelating agent ethylenediaminetetraacetic acid (EDTA), the Cu 2+ Stripping from carbon quantum dots to realize the recycling of carbon quantum dots.

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Abstract

The invention provides a red luminescent carbon quantum dot material, a preparation method and application thereof. The developed red carbon quantum dot can effectively detect trace Cu<2+> ions in a solution. The carbon quantum dot provided by the invention is prepared by: taking a mixed solution of dimethyl sulfoxide and dimethylformamide as the solvent, adopting citric acid and urea as the reaction precursor, and carrying out solvothermal reaction. The red luminescent carbon quantum dot provided by the invention can be used for detection of Cu<2+> ion content in a solution, and the detection limit can be as low as 40nM. The method provided by the invention has the advantages of simple preparation technology, low cost, high yield and easy enlarged production, etc. The obtained product has good dispersion, uniform shape and narrow particle size distribution, also has high efficiency red light emission characteristics, and is expected to be widely applied in the field of high sensitivity heavy metal detection in organisms.

Description

technical field [0001] The invention belongs to the field of solid luminescent materials, in particular to a red luminescent carbon quantum dot material and its preparation method and application. Background technique [0002] The detection of heavy metal ions such as mercury, cadmium, lead, and copper has received extensive attention in recent years. Among them, Cu 2+ Ions are vital trace elements present in all living organisms. Excessive uptake of Cu by organisms 2+ or lack of Cu 2+ Both will cause a series of serious diseases and lead to dysfunction. In addition, Cu 2+ Ions are also one of the pollution sources of drinking water. Therefore, the research and development of a class of preparation is simple, reusable, good stability and Cu 2+ Ion detection materials with high selectivity and high sensitivity are very necessary. [0003] In recent years, the detection of heavy metal ions in solution or in vivo based on fluorescence analysis technology has been proved...

Claims

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Application Information

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IPC IPC(8): C09K11/65C01B32/15B82Y20/00B82Y40/00G01N21/64
CPCB82Y20/00B82Y40/00C09K11/65G01N21/6428
Inventor 陈大钦刘珅武巍巍
Owner HANGZHOU DIANZI UNIV
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