Au-loaded ZnO microspheres as well as preparation method and application thereof

A technology of microspheres and nanoparticles, applied in measuring devices, instruments, and material analysis through electromagnetic means, can solve the problems of low sensitivity and high working temperature of aniline gas sensors, and achieve low working temperature, low preparation cost and high yield high effect

Pending Publication Date: 2022-01-11
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the aniline gas sensor has the disadvantages of low sensitivity and high working temperature.

Method used

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  • Au-loaded ZnO microspheres as well as preparation method and application thereof
  • Au-loaded ZnO microspheres as well as preparation method and application thereof
  • Au-loaded ZnO microspheres as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of the Au-loaded ZnO microspheres of this embodiment is as follows:

[0027] (1) Prepare zinc salt solution: dissolve 0.1g CTAB in a mixture of 30 mL ethanol and 15 mL deionized water, add 1 mmol zinc acetate to prepare zinc salt solution;

[0028] (2) Preparation of ZnO microspheres: add 0.5 mmol NaOH to the zinc salt solution in step (1) to obtain a suspension; after hydrothermal reaction at 100°C for 12 hours, the obtained product is washed, dried, and calcined at 300°C for 2 hours to obtain ZnO microspheres ball;

[0029] (3) Preparation of Au-loaded ZnO microspheres: Add 100 mg of ZnO microspheres prepared in step (2) to a solvent of 4 mL of methanol and 20 mL of deionized water and add 133 μL of 1 g / L chloroauric acid solution (wherein the Au content is 0.1 mg), after stirring evenly, photodeposited for 0.5 h to obtain Au-loaded ZnO microspheres.

Embodiment 2

[0031] The preparation method of the Au-loaded ZnO microspheres of this embodiment is as follows:

[0032] (1) Prepare zinc salt solution: dissolve 0.1g AOT in a mixture of 30 mL methanol and 10 mL deionized water, add 1 mmol zinc nitrate to prepare zinc salt solution;

[0033] (2) Preparation of ZnO microspheres: Add 1 mmol urea to the zinc salt solution in step (1) to obtain a suspension; after hydrothermal reaction at 100°C for 12 hours, the obtained product is washed, dried, and calcined at 300°C for 2 hours to obtain ZnO microspheres ball;

[0034] (3) Preparation of Au-supported ZnO microspheres: Add 100 mg of ZnO microspheres prepared in step (2) to a solvent of 4 mL methanol and 20 mL deionized water and add 500 μL of 1 g / L chloroauric acid solution (wherein the Au content is 0.38 mg), after stirring evenly, photodeposited for 1 h to obtain Au-loaded ZnO microspheres.

Embodiment 3

[0036] The preparation method of the Au-loaded ZnO microspheres of this embodiment is as follows:

[0037] (1) Prepare zinc salt solution: Dissolve 0.1g PVP in a mixture of 35 mL ethylene glycol and 5 mL deionized water, add 1 mmol zinc chloride to prepare zinc salt solution;

[0038] (2) Preparation of ZnO microspheres: add 2 mmol ammonia water to the zinc salt solution in step (1) to obtain a suspension; after hydrothermal reaction at 100°C for 12 hours, the obtained product is washed, dried, and calcined at 300°C for 2 hours to obtain ZnO microspheres ball;

[0039] (3) Preparation of Au-loaded ZnO microspheres: Add 100 mg of ZnO microspheres prepared in step (2) to a solvent of 4 mL methanol and 20 mL deionized water and add 800 μL of 1 g / L chloroauric acid solution (where the Au content is 0.6 mg), after stirring evenly, photodeposited for 2 h to obtain Au-loaded ZnO microspheres.

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Abstract

The invention discloses a preparation method of Au-loaded ZnO microspheres and application thereof in aniline sensing, wherein the Au-loaded ZnO microspheres are composed of Au nanoparticles and a ZnO substrate material, and the Au nanoparticles uniformly grow on the surface of ZnO through a photodeposition method. The preparation method comprises the following steps: ultrasonically dispersing a zinc salt and a surfactant into a mixed solution of deionized water and low-carbon alcohol to form a uniform dispersion system; adding a precipitator, and further stirring the mixture at room temperature to obtain turbid liquid; transferring the obtained turbid liquid into a high-pressure reaction kettle, and obtaining a ZnO precursor through a thermal solvent method; and further, calcining the ZnO precursor to obtain the ZnO microspheres; finally, depositing the Au nanoparticles on the surfaces of the ZnO microspheres through photodeposition. The ZnO microspheres have high-sensitivity response to aniline gas in a room-temperature working environment, and the sensitivity of the ZnO microspheres to 100 ppm aniline reaches 36.3.

Description

technical field [0001] The invention relates to the preparation of an Au-loaded ZnO microsphere material and its application in aniline sensors. Background technique [0002] As an important by-product in the process of cell growth, the content of aniline is often used as an important indicator for evaluating the physicochemical properties of cells. It can be used as a biomarker for early detection of various diseases, such as liver disease, lung cancer, uremia, etc. A large amount of aniline is also produced in the process of biomass decomposition and waste incineration, causing serious damage to the ecosystem. In addition, aniline is an important chemical intermediate and raw material, which is widely used in chemical production industries such as pesticides, pigments, and plastics. However, the accumulation of aniline in the body can greatly increase the risk of cancer, which brings additional attention to the detection of aniline. Commonly used detection and analysis ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30
CPCG01N27/26G01N27/304
Inventor 张永辉彭明星岳丽娟巩飞龙杨玄宇陈俊利方少明张浩力刘战群
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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