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Method for enhancing fluorescence of MXene quantum dots

A technology of fluorescence enhancement and quantum dots, which is applied in chemical instruments and methods, nano optics, luminescent materials, etc., can solve the problems of practical application difficulties, poor fluorescence emission performance, and low fluorescence quantum yield, so as to improve the fluorescence emission ability, The effect of low cost and simple enhancement method

Active Publication Date: 2020-05-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are problems of low fluorescence quantum yield, poor fluorescence emission performance, and difficulties in practical application. At present, there is still a lack of effective methods for enhancing the photoluminescence ability of MQDs.

Method used

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  • Method for enhancing fluorescence of MXene quantum dots
  • Method for enhancing fluorescence of MXene quantum dots
  • Method for enhancing fluorescence of MXene quantum dots

Examples

Experimental program
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Effect test

Embodiment approach 1

[0031] Preparation of Ti by hydrothermal method 3 C 2 QDs as an example. Use a reactor to prepare Ti by heating and reacting in the reactor 3 C 2 QDs. Specifically: the Ti 3 AlC 2 The powder is added to a certain concentration of HF aqueous solution, and the HF aqueous solution will etch away the Al element in it to obtain the MXene material. The obtained MXene material was dissolved by adding deionized water, and ultrasonically treated until the solution was uniform and transparent without precipitation. And the clear solution was reacted in an autoclave at 120°C for 6h. Finally, the solution obtained by the reaction is filtered with a filter membrane to obtain Ti 3 C 2 Aqueous solution of MQDs (0.1 mg / mL).

[0032] Subsequent to the obtained Ti 3 C 2 QDs are subjected to hydrogen peroxide (H 2 o 2 ) post-treatment carries out surface modification to quantum dots, modification method is: step 1. the volume fraction is the 30% H of 10 μ L 2 o 2 Add to 2mL MQ...

Embodiment 2

[0040] Preparation of Ti by alkali reflux method 3 C 2 QDs as an example. Preparation of Ti by NaOH-Assisted Reflux Method 3 C 2 QDs. Specifically: the Ti 3 AlC 2 The powder is added to a certain concentration of HF aqueous solution, and the HF aqueous solution will etch away the Al element in it to obtain the MXene material. The obtained MXene material was added into a mixed solution of sodium hydroxide, polyethylene glycol 200 (PEG 200) and deionized water for dissolution, and ultrasonic treatment was performed to make the solution uniform and transparent without precipitation. And the resulting clear solution was refluxed at 120 °C for 6 h. In order to remove impurities, the resulting clear solution is finally dialyzed with a semi-permeable membrane to obtain Ti 3 C 2 Aqueous solution of MQDs (0.1 mg / mL).

[0041] Subsequent to the obtained Ti 3 C2 Hydrogen peroxide (H 2 O 2 ) post-treatment to modify the surface of the quantum dots and to detect the fluores...

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Abstract

The invention relates to the field of fluorescence enhancement application, in particular to a method for enhancing fluorescence of MXene quantum dots. The method comprises the following specific steps: firstly, adding H2O2 with the volume fraction of 30% into an MQDs solution with the concentration of 0.1 mg / mL; carrying out ultrasonic treatment on the MQDs solution for 4-6 minutes to uniformly mix the MQDs solution, and naming the mixed solution as H-MQDs. Quantum dots (MQDs) derived from a two-dimensional MXene material not only reserve excellent conductivity, temperature and chemical stability of an original MXene layered material, but also show good water solubility and photoluminescence performance, so that the MQDs have great application potential in the fields of biological imagingand the like. The MQDs can be prepared by hydrothermal and alkali reflux methods, and no matter which method is used for preparing the MQDs, hydrogen peroxide (H2O2) treatment can be used for changing the surface state of the MQDs, so that the fluorescence emission capacity of the MQDs is improved.

Description

technical field [0001] The present invention relates to fluorescence enhancement applications, in particular to MXenes (such as: Ti 3 C 2 ) The method for enhancing the fluorescence of quantum dots belongs to the field of semiconductor materials. Background technique [0002] Recently, MXene, a new layered two-dimensional ceramic material similar to graphene formed from transition metal carbon or nitride, has attracted extensive attention from scientists. Because it not only has strong conductivity, but also because the modified -F and -OH groups in the preparation process endow the nanosheets with excellent hydrophilicity, making MXene a combination of metal conductivity and hydrophilicity. Very broad application prospects. [0003] The zero-dimensional MXene material, MXene quantum dots (MQDs), not only retains the excellent electrical conductivity and water solubility of the original two-dimensional MXene layered material, but also exhibits many excellent properties di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/65
Inventor 李妍张莎王钊姜尚佐
Owner UNIV OF SCI & TECH BEIJING
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