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Carbon nanodots with effective wide absorption and preparation method thereof

A technology of carbon nano-dots and high boiling point, which is applied in the field of carbon nano-dots to achieve the effects of convenient solution processing, low price and simple preparation method

Active Publication Date: 2016-04-20
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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AI Technical Summary

Benefits of technology

This patented technology allows for efficient production of small particles made from low cost starting material such as urethane or carbocyanate molecules that can be used to create various types of structures like quantum wells (QW) or conductive polymers. These tiny objects exhibit excellent optical response due to their large surface area per unit weight compared to traditional semiconductors. Additionally, these minute carbon nanopods show strong bonds between them without losing any part when they absorb certain wavelengths of electromagnetic radiation.

Problems solved by technology

This patents describes different ways how small particles called carboxylate salts can be used to create special types of nanosheets made up of tiny crystals known as quantum dots. These techniques allow scientists to study various aspects related to these structures including electronic transport, photosynthesis, catalytic activity, chemical reactions, biological processes like cell growth, gene regulation, cancer treatment, and drug delivery systems.

Method used

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  • Carbon nanodots with effective wide absorption and preparation method thereof
  • Carbon nanodots with effective wide absorption and preparation method thereof
  • Carbon nanodots with effective wide absorption and preparation method thereof

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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 4 hours to obtain a dark red liquid. After cooling, remove most of the DMF by rotary evaporation, add Ethanol is precipitated and centrifuged 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 so...

Embodiment 2

[0059] 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 200°C for 4 hours to obtain a dark red liquid. After cooling, remove most of the DMF by rotary evaporation, add Ethanol is precipitated and centrifuged 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. The...

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Abstract

The invention provides a preparation method of carbon nanodots with effective wide absorption. The method comprises the following steps: dissolving urea and polycarboxyl compounds in a high-boiling-point organic solvent, and heating under closed conditions to react to obtain the carbon nanodots with effective wide absorption. The carbon nanodots are prepared from the urea and polycarboxyl compounds by using the high-boiling-point solvent; and thus, the preparation method is simple, and the preparation raw materials are cheap. Therefore, the obtained carbon nanodots have effective wide absorption peak in the whole visible light region. In addition, the prepared carbon nanodots have favorable solubility in water and organic solvents, and thus, are convenient for solution processing. Besides, the carbon nanodots have favorable crystallinity, thereby being beneficial to developing photoelectric properties of the carbon nanodots.

Description

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Claims

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Application Information

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Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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