Fluorescent paper based sensor for visually detecting Fe<3+> and preparation method thereof

A sensor, paper-based technology, used in fluorescence/phosphorescence, instruments, measuring devices, etc., can solve the problem of poor uniformity of coating methods, detection probes that are easily washed or dissolved by water or organic solvents, affecting detection accuracy, etc. problem, to achieve the effect of stable color rendering, good water solubility and good selectivity

Inactive Publication Date: 2019-04-19
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the uniformity of the coating method is poor, and the detection probe is easily washed away or dissolved by water or organic solvents, thus affecting the accuracy of detection

Method used

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  • Fluorescent paper based sensor for visually detecting Fe&lt;3+&gt; and preparation method thereof
  • Fluorescent paper based sensor for visually detecting Fe&lt;3+&gt; and preparation method thereof
  • Fluorescent paper based sensor for visually detecting Fe&lt;3+&gt; and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Weigh 100mg of citric acid, put it into a small beaker, inject deionized water to obtain 50ml of citric acid solution with a concentration of 2mg / ml; after the citric acid solution is fully dissolved, transfer it to a 100ml polytetrafluoroethylene liner, and add 2ml of ammonia water, cover the lid as soon as possible, put the liner into the reaction kettle and tighten it; set the temperature of the vacuum drying oven to 200°C, and the time is 180min, put the reaction kettle into the reaction; Dialyze in deionized water until the internal and external fluid system of the dialysis bag (3000Da) is stable, and the pH value measured by a pH meter is neutral; collect the light yellow N-GQDs probe solution and store it away from light.

[0031] (2) Preparation of fluorescent paper-based sensors by immersion method: design six rectangular detection areas with a size of 10 mm × 5 mm, and use a pencil to draw a sketch of the detection area on the filter paper base, and use a cra...

Embodiment 2

[0038] (1) The preparation of the fluorescent paper-based sensor was as in the steps (1) and (2) of Example 1.

[0039] (2) Prepare standard stock solutions of other common coexisting metal ions respectively.

[0040] (3) Take an appropriate volume of other ion standard solutions in step (2) and dilute to an appropriate multiple with deionized water to obtain other ion solutions with a concentration of 2000 μmol / L.

[0041] (4) Drop other ions in step (3) onto the prepared fluorescent paper-based sensor respectively.

[0042] (5) The selectivity diagram of the fluorescent paper-based sensor prepared by soaking method to other metal ions, such as image 3 shown.

Embodiment 3

[0044] (1) The preparation of the probe solution was as in step (1) of Example 1.

[0045] (2) Fluorescent paper-based sensor prepared by inkjet method: design a detection area pattern of 10 mm × 10 mm in a word document; connect the HP inkjet printer online, inject the N-GQDs fluorescent probe solution into the cleaned ink cartridge, and use it for fluorescence Printing of the detection area; the detection area is printed on a paper medium by an inkjet printer, and the printing process is repeated 10 times to obtain the visual detection Fe 3+ Fluorescent paper-based sensors.

[0046] (3) Fe 3+ The preparation of the standard storage solution was as in step (3) of Example 1.

[0047] (4) get the Fe of appropriate volume in step (3) 3+ Standard solution, dilute appropriate times with deionized water to obtain Fe with concentrations of 50, 150, 300, 600, 1000, 2000 μmol / L 3+ .

[0048] (5) Take the above-mentioned different concentrations of Fe 3+ Ions are added dropwise t...

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Abstract

The invention provides a fluorescent paper based sensor for visually detecting Fe<3+> and a preparation method thereof. First, a nitrogen-doped graphene quantum dots (N-GQDs) fluorescent probe solution is prepared, and then the N-GQDs fluorescent probe is fixed on a paper medium to obtain a fluorescent paper based sensor. After Fe<3+> with different concentration is added in drops, the fluorescentpaper based sensor can produce the change of fluorescence intensity, so as to achieve visual detection. The fluorescent probe solution can be immobilized by two methods which are a soaking method andan ink jet method. The soaking method comprises the following steps of: soaking filter paper in the N-GQDs probe solution for incubation to obtain a solid fluorescent probe; the ink jet method uses the N-GQDs probe solution as ink to print the fluorescent probe on security paper by spraying the ink. The two fluorescent paper based sensors are convenient in detection and fast in response speed, can achieve naked eye detection of Fe<3+> under ultraviolet light, are suitable for on-site real-time visual detection, and provide an effective way for detecting Fe<3+> in a water phase.

Description

technical field [0001] The present invention relates to a method for detecting Fe 3+ The preparation method and application of the N-GQDs fluorescent probe solution and its visualized fluorescent paper-based sensor, especially the N-GQDs fluorescent probe solution fixed by the immersion method and the inkjet printer method, and the obtained two kinds of detection Fe 3+ The fluorescent paper-based sensor, which is fast, sensitive, and well-selected, is expected to be used in the environment or in the human body. 3+ detection. Background technique [0002] Iron is a trace element necessary for life, Fe 3+ Participate in the composition of various enzymes in organisms, and participate in many biochemical reactions in biological cells, it can be said that Fe 3+ Indispensable in processes such as biological signal transduction and substance transport. Fe 3+ Deficiency and excess will have a great impact on the health of organisms. If Fe in the body 3+ Insufficient, the syn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
CPCG01N21/6428
Inventor 周奕华吴丽辉钱俊陆菲邓亚峰张天磊
Owner WUHAN UNIV
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