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Gold nanoflower-quantum dot-based superstructure sensor and preparation method and application thereof

A gold nanoflower, quantum dot technology, applied in the field of chemical detection, can solve the problems of low detection sensitivity, TNT analog interference, fluorescence quenching, etc.

Inactive Publication Date: 2014-03-26
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still some problems in the existing detection technology, such as: the interference of some TNT analogues in the detection process, the detection sensitivity is low, etc. At the same time, the design of fluorescence method detection is mostly based on fluorescence quenching

Method used

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  • Gold nanoflower-quantum dot-based superstructure sensor and preparation method and application thereof
  • Gold nanoflower-quantum dot-based superstructure sensor and preparation method and application thereof
  • Gold nanoflower-quantum dot-based superstructure sensor and preparation method and application thereof

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preparation example Construction

[0028] The invention provides a method for preparing a superstructure sensor based on gold nanoflowers-quantum dots, wherein the method includes:

[0029] (1) Add sodium citrate to the boiled first chloroauric acid solution, continue heating until the color of the solution is wine red, then stop heating to obtain the mixture M1;

[0030] (2) Adjust the pH value of the second chloroauric acid solution to 10.8-12 to obtain solution M2, and then add the mixture of hydroxylamine hydrochloride and mixture M1 to solution M2 until the color of the solution turns blue-green, and gold nanoflowers are obtained ;

[0031] (3) modifying the surface of the gold nanoflowers with a first modifier to obtain surface-modified gold nanoflowers;

[0032] (4) Mix the second modifying agent with the cadmium chloride solution and adjust the pH value to 10.8-12, and then pass nitrogen gas into the obtained mixed solution to remove oxygen therein;

[0033] (5) adding a tellurium source to the soluti...

Embodiment 1

[0046]Preparation: (1) Take 10 mL of chloroauric acid solution with a concentration of 0.25 mmol / L, stir it under heating until the chloroauric acid solution boils, and then take 100 μL of 5% sodium citrate solution Add to the above boiling chloroauric acid solution, then continue to heat until the color of the solution turns into wine red, and stop heating to obtain the mixture M1; (2) Take 11.1mL of chloroauric acid solution with a concentration of 0.25mmol / L, and adjust it with NaOH The pH value of the chloroauric acid solution reaches 11.8 to obtain solution M2, then 900 μL of M1 and 90 μL of hydroxylamine hydrochloride mixed solution with a concentration of 40 mmol / L are added to M2, the above mixture is shaken and mixed, and the color of the solution becomes blue-green, and the obtained Gold nanoflowers; (3) Take 5 mL of gold nanoflowers and centrifuge to get the precipitate, and then 500 μL concentration is 2×10 -5 mol / L of mercaptoethylamine was added to the obtained p...

Embodiment 2

[0049] Preparation: (1) Take 11.5 mL of chloroauric acid solution with a concentration of 0.33 mmol / L, stir it under heating conditions until the chloroauric acid solution boils, and then take 130 μL of 5% sodium citrate The solution was added to the above boiling chloroauric acid solution, and then continued to heat until the color of the solution turned wine red, and the mixture M1 was obtained; 1 L of NaOH to adjust the pH value of the chloroauric acid solution to 11.2 to obtain solution M2, then add 1750 μL of M1 and 120 μL of hydroxylamine hydrochloride mixture with a concentration of 40 mmol / L into M2, shake and mix the above mixture, and the color of the solution becomes Blue-green, to get gold nanoflowers; (3) Take 5mL of the gold nanoflowers and centrifuge to get the precipitate, and then 550μL concentration is 2×10 -5 mol / L of mercaptoethylamine was added to the obtained precipitate, stirred for three hours and then centrifuged, the precipitate after centrifugation w...

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Abstract

The invention discloses a gold nanoflower-quantum dot-based superstructure sensor and a preparation method and application thereof. The preparation method comprises the following steps: adding sodium citrate into first chloroauric acid, and further heating to obtain a mixture M1; adding a mixed solution of hydroxylamine hydrochloride and the M1 into a second chloroauric acid solution M2 whose pH has been regulated, and obtaining gold nanoflowers when the solution turns into blue green; modifying the gold nanoflowers by using a first modifier to obtain the surface-modified gold nanoflowers; mixing a second modifier with a cadmium chloride solution, adjusting the pH value, and then inflating nitrogen into the solution; adding a tellurium source into the solution prepared therefore, heating for refluxing to obtain quantum dots; and mixing and assembling the modified gold nanoflowers and the quantum dots. In the preparation method, the trinitrotoluene content of a sample is measured through fluorescence intensity. The invention implements a method, by which the sensitivity and selectively of TNT (trinitrotoluene) detection can be improved, and during the TNT detection, interference of TNT analogues on the detection can be avoided as much as possible.

Description

technical field [0001] The invention relates to the field of chemical detection, in particular to a superstructure sensor based on gold nanoflowers-quantum dots and its preparation method and application. Background technique [0002] With the rapid development of society, environmental and health problems have attracted more and more attention, and the detection of pollutants in life has also attracted more and more attention, especially the detection of some trace and trace pollutants. important. Trinitrotoluene, also known as TNT, is easy to penetrate into the soil and groundwater during its production and transportation, causing great harm to the environment. It can also invade the human body through the skin, respiratory tract, and digestive tract, causing acute and chronic poisoning in humans, such as liver lesions, aplastic anemia, and cataracts, which can lead to death in severe cases. Therefore, it is particularly important to study the impact of trace TNT on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 夏云生陈辉德谭康慧杨光沈鹏飞
Owner ANHUI NORMAL UNIV
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