Method for synthesizing carbon quantum dots on basis of amino acids and iron ions

A technology for synthesizing carbon quantum and amino acid, which is applied in the field of preparation of fluorescent nanomaterials, can solve the problems of complicated preparation method, harsh reaction conditions, low product quantum yield, etc., and achieves the effect of easy control of synthesis method.

Inactive Publication Date: 2016-08-10
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the preparation methods of carbon quantum dots are relatively complicated and cumbersome, require harsh reaction conditions, and the quantum yield of the obtained products is not high, and various shortcomings limit the further application of carbon quantum dots.

Method used

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  • Method for synthesizing carbon quantum dots on basis of amino acids and iron ions
  • Method for synthesizing carbon quantum dots on basis of amino acids and iron ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Synthesis of carbon quantum dots from tryptophan

[0016] Weigh a certain amount of tryptophan, put its solution in ultra-pure water, add an appropriate amount of hydrochloric acid solution to the water during the dissolution process to completely dissolve tryptophan, and place the prepared tryptophan aqueous solution in a water bath at 80°C Heating, respectively heating 3h, 6h, 9h, 20h, 27h, 31h, 43h, take out the sample bottle, and cool to room temperature. Fluorescent detection at an excitation wavelength of 380 nm by figure 1 It was found that with the increase of heating time, the fluorescence intensity of carbon quantum dots synthesized by tryptophan gradually increased.

Embodiment 2

[0018] Synthesis of carbon quantum dots from iron ion doped tryptophan

[0019] Add 3mL 15mM tryptophan solution and 3mL ferric nitrate solution of different concentrations into the sample bottle, the molar ratio of tryptophan to iron ion is 1:1, 5:1, 10:1, 20:1, 40 : 1. Mix and oscillate, place in a water bath at 80°C and heat for 6 hours, then take out the sample bottle, cool to room temperature, and detect fluorescence at an excitation wavelength of 380nm. When the ratio of tryptophan to iron ion is 5:1, the fluorescence intensity of the synthesized carbon quantum dots is the highest.

Embodiment 3

[0021] Selectivity of iron ions

[0022] Add 5mL of 10mM tryptophan solution and 5mL of 2mM different cation-containing solutions into the sample vials, mix and shake, place in a water bath at 80°C for 20h, and then take out the sample vials and cool to room temperature. Fluorescent detection was performed at an excitation wavelength of 380 nm. The cations used are potassium ions, calcium ions, sodium ions, magnesium ions, chromium ions, manganese ions, iron ions, cobalt ions, nickel ions, copper ions, zinc ions, mercury ions, lead ions, and only iron ions can significantly enhance the fluorescence of tryptophan.

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Abstract

The invention provides a method for synthesizing carbon quantum dots on the basis of amino acids and iron ions, belonging to the field of preparation of fluorescent nano materials. The method comprises the following steps: oscillating and mixing a mixed solution of iron nitrate and amino acid in a mole ratio of 1:(5-10), and heating to react in an 80-DEG C water bath; and after the reaction finishes, naturally cooling to room temperature, dialyzing and filtering to obtain the carbon quantum dot water solution. The added iron nitrate can enhance the fluorescence intensity of the carbon quantum dots synthesized from tryptophan; and particularly, it is detected that only iron ions have such effects at present. By using accessible tryptophan as the carbon source, the iron ions are doped on such basis to synthesize the high-fluorescence carbon quantum dots. The synthesis method is controllable, simple and economical.

Description

technical field [0001] The invention relates to a method for preparing fluorescent nanometer materials, in particular to a method for synthesizing carbon quantum dots based on amino acids and iron ions. Background technique [0002] In recent years, the emergence of carbon quantum dots has aroused great interest. Compared with metal quantum dots, semiconductor quantum dots, and organic biological dyes, carbon quantum dots have superior biocompatibility and low toxicity, less damage to cells, higher stability and photobleaching resistance. Therefore, carbon quantum dots Quantum dots are an ideal bioluminescent probe. At present, the reported methods for preparing carbon quantum dots can be generally divided into two categories: one is to use carbon materials such as graphite and diamond to prepare carbon quantum dots; the other is to directly synthesize carbon-containing molecular precursors. However, most of the preparation methods of carbon quantum dots are complicated an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C01B31/02
CPCC09K11/65
Inventor 韩冰雁侯绪芬相荣超许杰彭婷婷李莹于明波
Owner DALIAN UNIV OF TECH
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