Preparation method of porous nickel oxide/tin dioxide micro/nano spheres

A technology of tin dioxide and micro-nano spheres, applied in the direction of material resistance, etc., can solve the problems of low response sensitivity, the inability to realize the regulation of the morphology and microstructure of tin dioxide nanocrystals, and the restriction of gas-sensing characteristics, etc., to achieve The effect of high sensitive response, non-variability, and simple process

Inactive Publication Date: 2014-04-16
ANHUI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The tin dioxide rod-shaped nanocrystals prepared by this method have a certain sensitive response to ethanol gas, but the response sensitivity is not high, mainly because the sensitive film formed by the extremely small tin dioxide nanorods will cause a large number of closed pores, It blocks the outside gas from reaching the inside of the sensitive film, thus restricting the further improvement of its gas-sensing properties, especially the improvement of sensitivity; regulation of structure

Method used

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  • Preparation method of porous nickel oxide/tin dioxide micro/nano spheres
  • Preparation method of porous nickel oxide/tin dioxide micro/nano spheres
  • Preparation method of porous nickel oxide/tin dioxide micro/nano spheres

Examples

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Effect test

Embodiment 1

[0040] Dissolve the sodium stannate raw material in water, adjust the pH value of the solution to 12.60 with 5.0M sodium hydroxide, and prepare 30 ml of 0.5M sodium stannate solution, then add 3 ml of concentrated ammonia water (mass percentage concentration is 25.0-28.0% ), under magnetic stirring at a speed of 60 rpm, add 15 ml of 1.0M nickel sulfate solution to obtain a mixed solution;

[0041] Standing and aging for 6 hours at a temperature of 80°C, a light green precipitate was obtained; the light green precipitate was filtered, washed, and dried to obtain a micronano-spherical nickel hydroxystannate precursor. The product characterization results are shown in the appendix figure 1 And attached figure 2 shown;

[0042] The micro-nano spherical nickel hydroxystannate precursor was calcined at 700°C for 2h, and after natural cooling, a light yellow porous micro-nano spherical NiO / SnO 2 Mixture powder, product characterization results are attached image 3 And attached ...

Embodiment 2

[0044] Dissolve the tin tetrachloride pentahydrate raw material in water, adjust the pH value of the solution to 13.50 with 5.0M sodium hydroxide, prepare 30 milliliters of 0.5M sodium stannate solution, then add 4 milliliters of concentrated ammonia (mass percentage concentration is 25.0 -28.0%), under magnetic stirring at a speed of 50 rpm, add 15 ml of 1.0M nickel sulfate solution to obtain a mixed solution;

[0045] Standing and aging for 6 hours at a temperature of 60°C, a light green precipitate was obtained; the light green precipitate was filtered, washed, and dried to obtain a micronano-spherical nickel hydroxystannate precursor;

[0046] The micro-nano spherical nickel hydroxystannate precursor was calcined at 720°C for 2h, and after natural cooling, a light yellow porous micro-nano spherical NiO / SnO 2 Hybrid powder.

Embodiment 3

[0048] Dissolve the tin tetrachloride pentahydrate raw material in water, adjust the pH value of the solution to 11.80 with 5.0M sodium hydroxide, prepare 30 milliliters of 0.5M sodium stannate solution, then add 6 milliliters of concentrated ammonia water (mass percentage concentration is 25.0 -28.0%), under magnetic stirring with a rotating speed of 80 rpm, add 15 ml of 1.0M nickel sulfate solution to obtain a mixed solution;

[0049] Standing and aging at 60° C. for 8 hours, a light green precipitate was obtained. The light green precipitate is filtered, washed, and dried to obtain a micro-nano spherical nickel hydroxystannate precursor;

[0050] The micro-nano spherical nickel hydroxystannate precursor was calcined at 800°C for 2h, and after natural cooling, a light yellow porous micro-nano spherical NiO / SnO 2 Hybrid powder.

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Abstract

The invention discloses a preparation method of porous nickel oxide / tin dioxide micro / nano spheres, which comprises the following steps: stirring tin tetrachloride pentahydrate, nickel sulfate hexahydrate, sodium hydroxide and ammonia water which are used as raw materials, heating, separating, washing, drying and the like to obtain micro / nano spherical hydroxy nickel stannate; and roasting a micro / nano spherical NiSn(OH)6 precursor at high temperature, and cooling to respectively obtain porous micro / nano spherical NiO / SnO2 powder. The micro / nano spherical NiO / SnO2 product prepared by the method disclosed by the invention is light green powder, and has the advantages of large specific area and good product quality. The impedance gas sensing element prepared from the micro / nano spherical NiO / SnO2 powder has high sensitivity, and the sensitivity S value for 100ppm methylbenzene and formaldehyde gases is respectively up to 19.8 and 27.6.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of micro-nano tin-based compounds, and in particular relates to a preparation method of micro-nano spherical nickel hydroxystannate and porous oxygen nickel / tin dioxide powder. Background technique [0002] Gas sensor is a type of sensor widely used in sensor systems in my country, and has been widely used in the fields of environmental protection, medical, automobile, metallurgy and chemical industry. In recent years, gas sensors have been used more and more widely, the most important of which are to prevent accidents, improve the quality of the living environment, ensure the consistency of production process conditions, and protect the environment. Semiconductor gas sensors have a series of advantages such as high sensitivity, simple structure, convenient use, and low price. Therefore, semiconductor gas sensors have always been the main gas sensors at home and abroad. [0003] Tin d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
Inventor 黄家锐王影影谷翠萍
Owner ANHUI NORMAL UNIV
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