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Preparation method and application of NiO-SnO2 composite material with flower-like structure

A composite material and flower-like structure technology, which is applied in the analysis of materials, material resistance, and material analysis through electromagnetic means, can solve the problems of improving gas-sensing performance, and achieve the effects of improving sensitivity, good crystallization, and good controllability

Inactive Publication Date: 2021-02-05
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a single optimization of the structure of the sensitive material itself cannot greatly improve the gas-sensing performance of the material itself.

Method used

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  • Preparation method and application of NiO-SnO2 composite material with flower-like structure
  • Preparation method and application of NiO-SnO2 composite material with flower-like structure
  • Preparation method and application of NiO-SnO2 composite material with flower-like structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of SnO 2 flower structure material

[0038] Step 1: Weigh with a balance, 2.3 g stannous chloride and 5.9 g sodium citrate, dissolve it in the mixed solution prepared by 40 mL ethanol and 40 mL distilled water, stir magnetically at room temperature for 30 minutes until completely dissolved, and make water Thermally synthesized precursor solution.

[0039] Step 2: Transfer the precursor reaction solution prepared in Step 1 into a polytetrafluoroethylene-lined stainless steel autoclave with a filling degree of 80%, and seal it.

[0040] Step 3: Place the reaction kettle in Step 2 in an oven, keep it warm at 180° C. for 12 hours, and then cool it down.

[0041] Step 4: Centrifuge the reactant solution prepared in Step 3 to obtain a precipitate, and then wash it repeatedly with distilled water and absolute ethanol.

[0042] Step 5: Place the product of Step 4 in a drying oven at a constant temperature, dry at 60°C for 24 hours, and cool down after drying. ...

Embodiment 2

[0048] (1) Preparation of 1%NiO-SnO 2 flower structure composite

[0049] Step 1: 2.3 g of stannous chloride, 0.02 g of nickel nitrate, and 5.9 g of sodium citrate were dissolved in a mixed solution of 40 mL of ethanol and 40 mL of distilled water, stirred magnetically at room temperature for 30 minutes until completely dissolved, and prepared as Hydrothermal synthesis of precursor reaction solution.

[0050] Steps 2, 3, 4, 5 and 6 are the same as in Example 1.

[0051] (2) 1%NiO-SnO 2 Structural characterization of flower-like structure composites

[0052] The crystal structure of the product was characterized by XRD powder diffractometer (XRD, PANalytical X’Pert Pro). from figure 1 It can be seen that in the sample except monoclinic SnO 2 Except for the peak of NiO, there is no diffraction peak of NiO, which may be due to the relatively low content of NiO and the small size of NiO particles. The diffraction characteristic peaks are all sharp, and no other miscellaneou...

Embodiment 3

[0054] (1) Preparation of 3%NiO-SnO 2 flower structure composite

[0055] Step 1: Dissolve 2.3 g of stannous chloride, 0.07 g of nickel nitrate, and 5.9 g of sodium citrate in a mixed solution of 40 mL of ethanol and 40 mL of distilled water, stir magnetically at room temperature for 30 minutes until completely dissolved, and prepare water Thermally synthesized precursor reaction solution.

[0056] Steps 2, 3, 4, 5 and 6 are the same as in Example 1.

[0057] (2) 3%NiO-SnO 2 Structural characterization of flower-like structure composites

[0058] The crystal structure of the product was characterized by XRD powder diffractometer (XRD, PANalytical X’Pert Pro). from figure 1 It can be seen that in the sample except monoclinic SnO 2 Except for the peak of NiO, there is no diffraction peak of NiO, which may be due to the relatively low content of NiO and the relatively small particle size. The diffraction characteristic peaks are all sharp, and no other miscellaneous peaks ...

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Abstract

The invention discloses a preparation method and application of a NiO-SnO2 composite material with a flower-like structure, belonging to a preparation method and application of a gas sensitive material. According to the invention, a low-temperature one-step hydrothermal method is adopted as a synthesis method, stannous chloride and nickel nitrate which are cheap and easy to obtain are used as rawmaterials, sodium citrate is used as an auxiliary agent, and under mild conditions, the NiO-SnO2 composite material with the flower-like structure is prepared through a one-step hydrothermal synthesistechnology. The composite material is applied to the field of gas sensors. The whole production process is simple in process, high in operability, free of toxicity and harm and suitable for large-scale industrial production. The composite material prepared by the invention has a unique three-dimensional flower-like structure, and a hierarchical pore channel is constructed, so gas to be detected can be more rapidly diffused in the material; and a p-n heterojunction is introduced, so the material shows higher sensitivity and selectivity, rapid response and recovery characteristics and good stability to ethanol gas, has wide prospects in the aspect of manufacturing of the gas sensors.

Description

technical field [0001] The invention relates to a method for preparing a gas-sensitive material and its application, in particular to a NiO-SnO 2 Preparation method and application of flower-like structure composite material. Background technique [0002] Ethanol is a popular chemical product with a wide range of uses, simple production process, and sufficient supply of raw materials. It has been widely used in national defense industry, medical and health care, organic synthesis, food industry, and industrial and agricultural production. However, ethanol vapors are toxic, flammable and explosive. In our industrial production and daily life, if it leaks accidentally, it will lead to major accidents such as explosions and fires at any time. In addition, ethanol can inhibit the central nervous system of the human body, leading to neuropathy and even death. At the same time, traffic accidents caused by drunk driving occur from time to time. Therefore, in order to ensure the ...

Claims

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Application Information

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IPC IPC(8): C01G53/04C01G19/02G01N27/12
CPCC01G53/04C01G19/02G01N27/125C01P2004/61C01P2004/82C01P2004/03C01P2002/72
Inventor 孟丹游宇伞晓广乔桐桐巩晓辉
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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