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Atmospheric micro plasma assisted preparation method and application of acid resistant carbon quantum dot

A micro-plasma, carbon quantum dot technology, applied in chemical instruments and methods, nano-carbon, nanotechnology for materials and surface science, etc., can solve the problems of high energy consumption, long time, and inability to use pH detection, Achieve the effect of low energy consumption and good acid resistance

Active Publication Date: 2015-11-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As one of the more economical and simple methods, the hydrothermal method has defects such as high energy consumption, long time consumption, and complicated subsequent separation and purification methods.
BaiYang et al. (Document 1: Zhu, S.; Meng, Q.; Wang, L.; Zhang, J.; Song, Y.; Jin, H.; Zhang, K.; Sun, H.; Wang, H. ; Yang, B. Angewandte Chemie International Edition 2013, 52, 3953-3957.) The fluorescence intensity of carbon quantum dots prepared by hydrothermal method will decrease at low pH or high pH, ​​but remain basically unchanged between 4-11 , cannot be used for pH detection

Method used

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Embodiment 1

[0025] Rinse the 25mL beaker with deionized water and dry it for later use. Weigh 1.051 g of citric acid into a beaker, measure 335 μL of ethylenediamine into the beaker, add 10 mL of deionized water to it, and stir to make it a clear solution. Pour the solution into the reaction vessel, put the reactor on the test bench, adjust the argon gas flow to 60mL / min, and place the two discharge electrodes directly above the reactor, the cathode is a platinum wire electrode, and the anode is an argon gas tube with an inner diameter of 180 μm . The output current of the adjusted constant current power supply is 6mA, and the voltage is about 2400V. After the experiment started, the cathode platinum wire electrode was immersed in the solution, and the anode argon gas tube was slowly lowered until the discharge began. At this time, a stopwatch was used to count the time and keep the discharge stable for 1 min. After the discharge, the resulting solution was dialyzed in a dialysis bag (m...

Embodiment 2

[0028] Keep the discharge stable for 2 minutes, and the others are the same as in Example 1.

Embodiment 3

[0030] Keep the discharge stable for 5 minutes, and the others are the same as in Example 1.

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Abstract

The invention belongs to the technical field of synthesis and application of fluorescent carbon nanomaterials, and particularly relates to atmospheric micro plasma assisted preparation method and application of an acid resistant carbon quantum dot. The method uses citric acid and ethylenediamine as precursors, employs atmospheric micro plasma for assisting the preparation of acid-resistant carbon quantum dots, and has the advantages of fastness, simpleness, low energy consumption, and no subsequent modification. The prepared carbon quantum dot aqueous solution can be used for writing on filter paper, and the characters can emit blue fluorescence under ultraviolet lamp irradiation. The carbon quantum dot has good acid resistance, the fluorescence intensity is basically unchanged in 3mol / L HNO3 environment system compared to in aqueous solution, and remains stable. The fluorescence intensity of the carbon quantum dot shows linear change over a wide pH range, and is change-reversible, and can be used for pH testing. The carbon quantum dot can be used in fluorescent ink writing, pH testing, metal ion detection, biosensors, biological imaging and other fields.

Description

technical field [0001] The invention belongs to the technical field of synthesis and application of fluorescent carbon nanomaterials, and in particular relates to a normal-pressure micro-plasma-assisted preparation method of acid-resistant carbon quantum dots, and its application in fluorescent ink writing, pH detection, metal ion detection, biosensing, and bioimaging applications in other fields. Background technique [0002] Carbon quantum dots are a new type of inorganic carbon nanomaterial with fluorescent properties. It not only has the characteristics of adjustable fluorescence emission, wide excitation spectrum, high photostability, and small size of semiconductor quantum dots, but also has no heavy metal elements, low toxicity, Good biocompatibility and other advantages. The raw materials for preparing carbon quantum dots are widely available and cheap, and the large number of functional groups on the surface facilitates the functional modification of carbon quantum...

Claims

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Application Information

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IPC IPC(8): C01B31/02C09K11/65B82Y30/00C01B32/15
Inventor 陆跃翔王哲袁航陈靖
Owner TSINGHUA UNIV
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