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Carbon dot-based room-temperature phosphorescence test strip as well as preparation method and application thereof

A room temperature phosphorescence and test strip technology, which is applied in the field of analysis and detection, can solve the problems of slow acquisition of detection results, complex synthesis process, complicated use process, etc., and achieves the effects of stable phosphorescence luminescence performance, simple preparation method and low preparation cost.

Active Publication Date: 2021-03-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the above-mentioned problems in the prior art, the present invention provides a carbon dot-based room temperature phosphorescent test strip and its preparation method and application, so as to solve the complex synthesis process and the consumption of room temperature phosphorescent materials existing in the prior art. Long time, high cost, high toxicity, poor photostability and other problems, and at the same time solve the problems of high preparation cost, complicated use process and slow detection result acquisition of RTP photosensors in the prior art

Method used

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  • Carbon dot-based room-temperature phosphorescence test strip as well as preparation method and application thereof
  • Carbon dot-based room-temperature phosphorescence test strip as well as preparation method and application thereof
  • Carbon dot-based room-temperature phosphorescence test strip as well as preparation method and application thereof

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preparation example Construction

[0066] The preparation steps of the N-CDs / PAA include: adding the N-CDs into the polyacrylic acid solution under a water bath condition of 50-60° C., and stirring for 50-60 minutes to obtain the N-CDs / PAA. Wherein, during specific implementation, optionally, the mass concentration of the polyacrylic acid solution is 0.1-0.5 g / ml; the mass ratio of N-CDs to polyacrylic acid is 1:2-6.

[0067] It should be noted that although the N-CDs / PAA solution contains deionized water, when the N-CDs / PAA solution is drip-coated on the filter paper, and the filter paper is dried (dried), the deionized water is removed, The N-CDs / PAA will continue to stay on the filter paper and exhibit the characteristic of strong room-temperature phosphorescence emission, and finally the N-CDs / PAA room-temperature phosphorescence test strip is obtained, which has a good response to water in organic solvents.

[0068]In another embodiment, optionally, the preparation steps of N-CDs include: dissolving isopht...

Embodiment 1

[0074] First, the materials used in this example include: ethylenediamine (EDA), isophthalic acid (IPA), acetonitrile (ACN), anhydrous calcium chloride (CaCl 2 ) and molecular sieves were purchased from Chengdu Kelong Chemical Reagent Co., Ltd. (Chengdu, China). Polyacrylic acid (PAA) was produced by Sigma-Aldrich Co., Ltd. (Shanghai, China). Absolute ethanol, acetone, tetrahydrofuran (THF), magnesium sulfate (MgSO 4 ) and potassium permanganate (KMnO 4 ) were purchased from Jinshan Chemical Reagent Company, Chengdu, China. Phosphorus pentoxide (P 2 o 5 ) and calcium oxide (CaO) were obtained from Tianjin Kemiou Chemical Reagent Co., Ltd. (Tianjin). Organic solvents were dehydrated before use, and other chemicals used in the experiments were of analytical grade and used without further purification. Deionized water was used throughout the experiments.

[0075] Next, the implementation process is as follows:

[0076] Step 1, Synthesis of nitrogen-doped carbon dots (N-CD...

Embodiment 2

[0144] In the embodiment of the present invention, the experimental supplies such as experimental raw materials and equipment used are the same as those in Embodiment 1, and will not be repeated here.

[0145] The preparation method and process of this embodiment are similar to Example 2, the differences are as follows:

[0146] In step 1, the consumption of EDA is 10ml; The reaction temperature in the polytetrafluoroethylene lined autoclave is 160 ℃, and the reaction time is 8h; The purification time in the dialysis bag is 12h, and the temperature of vacuum drying is 40 ℃, The final product was also light yellow powder.

[0147] In step 2, 4.0 g of polyacrylic acid (PAA) was dissolved in 20 ml of deionized water, and stirred continuously at 55 ° C for 30 min to obtain a PAA solution; then 0.5 g of N-CDs synthesized in step 1 were added to the PAA solution, and stirred for another 1 h , to obtain N-CDs / PAA solution. The N-CDs / PAA solution was coated on filter paper by drop c...

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Abstract

The invention provides a carbon dot-based room-temperature phosphorescence test strip as well as a preparation method and application thereof. The room-temperature phosphorescence test strip is a filter paper strip containing NCDs / PAA. In the room-temperature phosphorescence test strip, an effective substance with high room-temperature phosphorescence emission performance is NCDs / PAA, and the NCDs / PAA is a room-temperature phosphorescence material obtained by embedding NCDs into a polyacrylic acid matrix. The room-temperature phosphorescence test strip provided by the invention shows bright green RTP emission under the excitation of ultraviolet light (365nm), the service life is as long as 769ms, and the naked eye recognizable time of phosphorescence emission is as long as 15s; meanwhile,under the action of water, due to the fact that hydrogen bonds in an NCDs / PAA system are destroyed, room-temperature phosphorescence quenching of NCDs / PAA is caused, and therefore room-temperature phosphorescence response to water is achieved. Therefore, the room-temperature phosphorescence test strip provided by the invention has the advantages of high sensitivity, good stability, accuracy, reliability and the like, and has a wide application prospect in the field of water detection.

Description

technical field [0001] The invention belongs to the field of analysis and detection, in particular to a room temperature phosphorescent test strip based on carbon dots and its preparation method and application. Background technique [0002] Water is the source of life for all things and plays a vital role in human survival and production. However, the presence of water in organic solvents is generally considered to be the most common impurity. For example, traces of water in organic solvents can dictate reactivity, reduce yields, or reduce reaction products. In addition, due to the ubiquitous presence of water in samples, it is difficult for experimenters to detect water. [0003] Karl Fischer titration is widely used as a traditional method and is considered the most reliable method for monitoring trace amounts of water in solvents. However, its further application is severely limited due to the lack of continuous monitoring, the need for special instruments, the use of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/65B82Y20/00B82Y30/00B82Y40/00G01N21/64
CPCC09K11/02C09K11/65B82Y20/00B82Y30/00B82Y40/00G01N21/64
Inventor 郑保战杜娟郭勇肖丹王冰袁晓英吕旭
Owner SICHUAN UNIV
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