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Preparation method of porous nano tin dioxide

A nano-tin dioxide, sodium hydroxide technology, applied in tin oxide, nanotechnology and other directions, can solve the problem that the response sensitivity is not high, the gas sensing characteristics are restricted, and the regulation of the morphology and microstructure of tin dioxide nanocrystals cannot be realized. and other problems, to achieve the effect of high sensitive response, simple process and non-deformation

Inactive Publication Date: 2014-01-29
ANHUI NORMAL UNIV
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  • Summary
  • 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 nano tin dioxide
  • Preparation method of porous nano tin dioxide
  • Preparation method of porous nano tin dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Dissolve the sodium stannate raw material in water, adjust the pH value of the solution to 13.60 with 5.0M sodium hydroxide, prepare 30 milliliters of 0.5M sodium stannate solution, and add 15 milliliters of 1.0 M cupric chloride solution, obtains mixed liquor;

[0047] Standing and aging for 6 hours at a temperature of 80°C, a blue precipitate was obtained; the blue precipitate was filtered, washed, and dried to obtain a nanorod-shaped copper hydroxystannate precursor. The product characterization results are shown in the appendix figure 1 And attached Figure 5 as shown in b;

[0048] The nanorod-shaped copper hydroxystannate precursor was calcined at 700 °C for 2 h, washed with 1.0 M hydrochloric acid after cooling, filtered, washed, and dried to obtain white porous nanorod-shaped SnO 2 Nano powder, product characterization results are attached figure 2 , attached Figure 5 c. attached Figure 6 And attached Figure 8 shown.

Embodiment 2

[0050] 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, and add 15 milliliters of 1.0M cupric chloride solution, obtain mixed solution;

[0051] Standing and aging at a temperature of 60°C for 6 hours, a blue precipitate was obtained; the blue precipitate was filtered, washed, and dried to obtain a nanorod-shaped copper hydroxystannate precursor;

[0052] The nanorod-shaped copper hydroxystannate precursor was calcined at 720 °C for 2 h, washed with 1.5M nitric acid after cooling, filtered, washed, and dried to obtain white porous nanorod-shaped SnO 2 Nano powder.

Embodiment 3

[0054] 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 ml of 0.5M sodium stannate solution, and add 15 milliliters of 1.0M cupric chloride solution, obtain mixed solution;

[0055] Standing and aging at 60°C for 8 hours, a light blue precipitate was obtained. The light blue precipitate was filtered, washed, and dried to obtain the precursor of copper hydroxystannate in the form of micron cubes. The product characterization results are shown in the attached image 3 And attached Figure 5 as shown in a;

[0056] The precursor of copper hydroxy stannate in micron cubic shape was roasted at 720°C for 2h, washed with 1.0M hydrochloric acid after cooling, filtered, washed and dried to obtain white porous micron cubic block SnO 2 Nano powder, product characterization results are attached Figure 4 , attached Figure 7 And attached Figure 9 shown.

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Abstract

The invention discloses a preparation method of porous nano tin dioxide. The method comprises the following steps: firstly, carrying out steps such as stirring, heating, separating, washing and drying on tin tetrachloride pentahydrate, sodium hydroxide and copper chloride dehydrate which are used as raw materials, so as to obtain a nano rod and micron cube-shaped hydroxyl copper stannate; and roasting CuSn(OH)6 precursors with two morphologies at high temperature and carrying out acidic washing after cooling, so as to respectively obtain a porous nano rod and micron cube-shaped SnO2 nano powder. The porous nano rod and micron cube-shaped SnO2 nano powder products prepared by the method are while powder, and are large in specific surface area and good in product quality. A resistive air-sensitive sensing element made of the SnO2 nano powder prepared by the method is high in sensitivity, and the sensitivity S value of the element on 100ppm toluene gas is up to 18.2.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of nano tin-based compounds, and in particular relates to a preparation method of micro-nano copper hydroxystannate and porous tin dioxide micro-nano 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 dioxide is a typical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G19/02B82Y40/00
Inventor 黄家锐徐小娟谷翠萍
Owner ANHUI NORMAL UNIV
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