A carbon nanodot with effective broad absorption and its preparation method

A technology of carbon nano-dots and high boiling point is applied in the field of carbon nano-dots to achieve the effects of good solubility, good crystallinity and simple preparation method

Active Publication Date: 2018-01-16
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, there are no reports of carbon nanodots with effective broad absorption in the entire visible light range and their synthesis methods

Method used

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  • A carbon nanodot with effective broad absorption and its preparation method
  • A carbon nanodot with effective broad absorption and its preparation method
  • A carbon nanodot with effective broad absorption and its preparation method

Examples

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preparation example Construction

[0032] The invention provides a method for preparing carbon nano-dots with effective broad absorption, comprising the following steps:

[0033] Dissolving urea and polycarboxylates in high-boiling organic solvents, heating and reacting under airtight conditions, obtains carbon nano-dots with effective broad absorption.

[0034] In the present invention, firstly, urea and polycarboxy compounds are dissolved in a high-boiling point organic solvent. In the present invention, the polycarboxy compound is preferably one or more of citric acid, oxalic acid and tartaric acid. The high boiling point organic solvent is preferably one or more of N, N'-dimethylformamide (DMF), N, N'-dimethylacetamide (DMAC) and dimethylsulfoxide (DMSO) kind.

[0035] Wherein, the present invention has no special limitation on the sources of the urea, the polycarboxy compound and the high-boiling point organic solvent, which are generally commercially available.

[0036] In the present invention, the ma...

Embodiment 1

[0051] Dissolve 3g of citric acid and 6g of urea in 30ml of DMF to form a mixed solution. The mixed solution is hydrothermally reacted in a 50ml polytetrafluoroethylene autoclave at 160°C for 4h to obtain a dark red liquid. After cooling, remove most of the DMF by rotary evaporation. Add ethanol to obtain precipitation, and centrifuge to obtain black carbon nano-dot powder;

[0052] The black powder is washed with ethanol, dialyzed in water with 500-1000 dialysis bags, and freeze-dried to obtain purified black carbon nano-dot powder. see figure 1 , figure 1 The photos of the carbon nanodots with effective broad absorption prepared in Example 1.

[0053] The carbon nano-dot powder is dissolved in water to obtain an aqueous dispersion of carbon nano-dots. see figure 2 , figure 2 Optical photograph of the aqueous dispersion of carbon nanodots.

[0054] Dissolving the carbon nano-dots in water and DMF respectively to prepare a saturated solution, respectively measuring the...

Embodiment 2

[0059] Dissolve 3g of citric acid and 6g of urea in 30ml of DMF to form a mixed solution. The mixed solution was hydrothermally reacted in a 50ml polytetrafluoroethylene autoclave at 200°C for 4h to obtain a dark red liquid. After cooling, remove most of the DMF by rotary evaporation. Add ethanol to obtain precipitation, and centrifuge to obtain black carbon nano-dot powder;

[0060] The black powder is washed with ethanol, dialyzed in water with 500-1000 dialysis bags, and freeze-dried to obtain purified black carbon nano-dot powder.

[0061] Measure the ultraviolet-visible absorption spectrum of the carbon nano-dot with effective broad absorption, the results are shown in Figure 6 , Figure 6 The ultraviolet-visible absorption spectrum of the carbon nanodots with effective broad absorption prepared in Example 2. Depend on Figure 6 It can be seen that the carbon nanodots have effective broad absorption in the entire visible region and extend to the near-infrared region. ...

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Abstract

The invention provides a method for preparing carbon nano-dots with effective broad absorption, comprising the following steps: dissolving urea and polycarboxylates in a high-boiling point organic solvent, heating and reacting under airtight conditions to obtain carbon nano-dots with effective broad absorption carbon nanodots. The invention uses urea and polycarboxy compounds as raw materials, and uses a high-boiling point solvent to prepare carbon nano-dots. The preparation method is simple and the preparation raw materials are cheap. The obtained carbon nano-dots have an effective broad absorption peak in the entire visible light region. In addition, the carbon nano-dots prepared by the present invention have good solubility in water and organic solvents, which is convenient for solution processing, and the carbon nano-dots have good crystallinity, which is beneficial to the development of the photoelectric properties of the carbon nano-dots.

Description

technical field [0001] The invention belongs to the technical field of carbon nano-dots, and in particular relates to a carbon nano-dot with effective wide absorption and a preparation method thereof. Background technique [0002] As a new type of carbon nanomaterial, carbon nanodots (CNDs) have unique structural and photoelectric properties, and their advantages such as simple preparation, low cost, and low toxicity make carbon nanodots have broad research and development value in the field of energy and environment. Application prospects. Different from other narrow-band (zero-bandgap) carbon nanomaterials (carbon nanotubes, graphene, etc.), carbon nanodots have significantly broadened optical absorption bandgap due to their zero-dimensional nanostructure and surface defects. At present, the reported The optical absorption of carbon nanodots is mainly in the ultraviolet, blue, and green light regions, and very few band edges extend to the red or near-infrared region, whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/15B82Y30/00
CPCC01P2002/72C01P2002/84C01P2004/01C01P2004/04
Inventor 曲松楠李迪
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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