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Chemical preparation method of graphene quantum dot fluorescence probe used for detecting trace of TNT (trinitrotoluene)

A technology of graphene quantum dots and fluorescent probes, applied in the field of material science, can solve the problems of unfriendly environment, complicated synthesis steps of detection materials, and insufficient specificity and sensitivity.

Active Publication Date: 2017-06-06
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Although the above inventions have many merits, the synthesis steps of the detection materials prepared by these methods are cumbersome, not only not specific and sensitive enough, but also some products are not friendly to the environment

Method used

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  • Chemical preparation method of graphene quantum dot fluorescence probe used for detecting trace of TNT (trinitrotoluene)
  • Chemical preparation method of graphene quantum dot fluorescence probe used for detecting trace of TNT (trinitrotoluene)
  • Chemical preparation method of graphene quantum dot fluorescence probe used for detecting trace of TNT (trinitrotoluene)

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specific Embodiment approach

[0070] Specific embodiments: a chemical preparation method of a graphene quantum dot fluorescent probe for trace TNT detection, oxidizing graphite with an oxidizing agent to obtain graphene oxide, reducing graphene oxide with a strong reducing agent, and finally performing a process with reduced graphene A series of reactions make blue and green graphene quantum dot fluorescent probes, which are characterized in that: the surface of the graphene quantum dot fluorescent probes is electron-rich, and the three electron-deficient nitro groups of the target analyte TNT molecule are electron-absorbing When the groups are close to each other in space, fluorescence resonance energy transfer occurs, and the detection of trace TNT is realized through the change of the fluorescence intensity of the graphene quantum dot fluorescent probe. The preparation process of the graphene quantum dot fluorescent probe includes Follow these three steps:

[0071] 1.1 The first step is the preparation ...

Embodiment

[0075] Embodiment: Using graphite as a raw material, graphene quantum dot fluorescent probes can be obtained through three-step reactions.

[0076] The first step is the preparation of graphene oxide: First, measure 20mL of HClO 4 Put it into a 100mL three-neck round bottom flask, place the above flask in a water bath, adjust the water temperature with ice cubes to keep it at about 0~5°C, then weigh 0.9845g of graphite with an electronic balance with an accuracy of 1 / 10,000, add In the above-mentioned flask, after stirring and reacting for 30min with 500rpm rotating speed, weigh 2.9756g of K 2 Cr 2 o 7 , continuously and slowly add to the above-mentioned flask within 1 hour, continue to stir and react for 1 hour, raise the temperature of the water bath to 35°C and continue to stir for 30 minutes, then slowly add 10 mL of deionized water to the above-mentioned flask, and seal the liquid surface of the water bath with silicone oil , connect the three-neck round bottom flask t...

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Abstract

The invention discloses a chemical preparation method of a graphene quantum dot fluorescence probe used for detecting trace of TNT (trinitrotoluene). The preparation process of the fluorescence probe comprises the following three steps: firstly, using HClO4 graphite oxide to prepare graphene oxide; secondly, using a buffer solution to adjust the pH value, using a strong reducing agent to reduce the prepared graphene oxide to graphene; and finally, putting the reduced graphene into an organic solvent in a polytetrafluoroethylene reaction kettle, closing, raising the temperature to 120 DEG C, reacting for 2 hours, and further processing to prepare the graphene quantum dot fluorescence probe capable of selectively and sensitively detect the TNT. A rich electron on the surface of the fluorescence probe and three electron deficiency nitro groups on a TNT target analyte molecule mutually act to cause fluorescence resonance energy transfer when getting close spatially, the fluorescence of the graphene quantum dot fluorescence probe is absorbed by the TNT target analyte molecule and is quenched, so that the trace of the target molecule of the explosive TNT is detected.

Description

technical field [0001] The invention relates to the field of material science, in particular to a preparation method of a graphene quantum dot fluorescent probe capable of detecting trace amounts of TNT. Background technique [0002] In recent decades, the safety of explosives has been the focus of global attention. Since the "911" incident in the United States, countries have stepped up the detection of explosives, especially nitroaromatic explosives. The detection of explosives has always been a challenging task. Although in the laboratory, there are accurate procedures and regulations for the determination of nitroaromatic explosives by using methods such as gas chromatography-mass spectrometry, high performance liquid chromatography, and surface-enhanced Raman spectroscopy. , and the results are reliable, selective, and repeatable, but this type of detection method is costly, time-consuming, and the steps are cumbersome, and the sample must be separated from the detectio...

Claims

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Application Information

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IPC IPC(8): G01N21/64
CPCG01N21/6428
Inventor 席小倩高大明漆天瑶周杨群孙虹朱德春陈红王晓晨刘安求张慧张凌云
Owner HEFEI UNIV
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