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A kind of multifunctional carbon dot material and its preparation method and application
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A multifunctional, carbon material technology, applied in the direction of nanotechnology, luminescent materials, chemical instruments and methods for materials and surface science, can solve the problem of only theoretical capacity of graphite, etc., achieve simple preparation process, good stability, The effect of mild synthetic conditions
Active Publication Date: 2018-06-26
NORTHEAST NORMAL UNIVERSITY
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Problems solved by technology
So far, the commercialized carbon anode material is graphite, but the theoretical capacity of graphite is only 372mAh g -1 , so it is necessary to seek a new carbon material to improve the capacity and cycle stability of lithium (sodium) ion batteries to meet the growing needs of the current people
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Embodiment 1
[0035] This embodiment provides a multifunctional carbon dot material, which is prepared through the following steps:
[0036] The egg yolk of the boiled egg is mashed and placed in a beaker, dried, and the dried egg yolk is placed in a tube furnace at 300°C for carbonization for 2 hours;
[0037] The carbonized egg yolk is placed in a beaker, cracked with a mixture of concentrated sulfuric acid and concentrated nitric acid (volume ratio 3:1), the oil bath is refluxed, and the reflux is completed, washed and dried with centrifugal distilled water to obtain a carbon material;
[0038] The dried carbon material was dissolved in 160 mL of distilled water, mixed and stirred until uniform, and hydrothermally reacted at 300° C. for 12 hours to obtain a solution of multifunctional carbon dot material.
[0039] The supernatant obtained by centrifuging the solution of the multifunctional carbon dot material and filtering is the carbon dot solution (CD-1) with fluorescence properties, a...
Embodiment 2
[0050] This embodiment provides a multifunctional carbon dot material, which is prepared through the following steps:
[0051] The preparation of carbon material is with embodiment 1;
[0052] Dissolve the dried carbon material in 160mL of distilled water, mix and stir until uniform, then divide the solution into four parts, conduct hydrothermal reaction at 185°C, 200°C, 250°C, and 300°C for 12 hours, and take the supernatant after centrifugation The obtained four kinds of carbon dot materials are respectively CD-3, CD-4, CD-5, CD-6, and their fluorescence quantum yields are 17.29%, 21.75%, 24.53%, 28.36%, respectively.
Embodiment 3
[0054] This embodiment provides a multifunctional carbon dot material, which is prepared through the following steps:
[0055] The preparation of carbon material is with embodiment 1;
[0056] Dissolve the dried carbon material in 160mL of distilled water, mix and stir until uniform, then divide the solution into four parts, perform hydrothermal reaction at 200°C for 6h, 12h, 18h, and 24h respectively, and take the supernatant after centrifugation to obtain four kinds of carbon dots The materials are respectively CD-7, CD-8, CD-9 and CD-10, and their fluorescence quantum yields are 18.19%, 18.99%, 21.97%, and 22.00%, respectively.
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Abstract
The invention provides a multifunctional carbon dot material and a preparation method and application of the multifunctional carbon dot material. The preparation method comprises the following steps: carbonizing dried cooked yolks; carrying out splitting decomposition on the carbonized cooked yolks with a mixed solvent of the concentrated nitric acid and the concentrated sulfuric acid; reflowing an oil bath; centrifuging and drying to obtain a carbon material rough product; dissolving the dried carbon material rough product into water; carrying out a hydrothermal reaction to obtain a solution of the multifunctional carbon dot material. The invention provides the multifunctional carbon dot material prepared by the preparation method provided by the invention. On one hand, the multifunctional carbon dot material can be used as a negative electrode material of a lithium / sodium ion battery; on the other hand, the multifunctional carbon dot material also has strong fluorescent properties and has a potential application prospect in the fields of biological imaging, panel display and the like.
Description
technical field [0001] The invention relates to a carbon material and a preparation method thereof, in particular to a multifunctional carbon dot material and a preparation method thereof, belonging to the technical field of carbon materials and its preparation. Background technique [0002] In recent years, carbon dots have attracted widespread attention due to their simple synthesis process, low cost, good water solubility, biocompatibility, and excellent chemical stability. These excellent properties of carbon dots make them have potential applications in many fields, including as drug carriers, cell imaging, photolysis of water and other fields. However, most of the raw materials for synthesizing carbon dots are chemical reagents, which do not conform to the concept of economical and environmentally friendly green chemistry; moreover, most carbon dots are difficult to preserve and can only be stored in solution. [0003] In addition, the rapid economic development in re...
Claims
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