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Cadmium indiumate octahedron microcrystal and its preparation method

A technology of octahedron and cadmium indium acid, which is applied in the field of cadmium indium acid octahedral microcrystals and its preparation, can solve the problems of complex process, limited gas-sensing performance of materials, high cost, etc., achieve simple preparation method, improve gas-sensing characteristics, cheap to produce effects

Inactive Publication Date: 2014-01-29
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above several technologies all have the disadvantages of complicated process, high cost, low efficiency, and the purity and microscopic morphology of the obtained materials cannot be effectively controlled, which limits the play of the material's gas-sensing performance.

Method used

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  • Cadmium indiumate octahedron microcrystal and its preparation method
  • Cadmium indiumate octahedron microcrystal and its preparation method
  • Cadmium indiumate octahedron microcrystal and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, preparation cadmium indium acid octahedral crystallite

[0026] Add 9 mL of indium sulfate aqueous solution (concentration: 0.4 mol / L) dropwise into 10 mL of cadmium chloride (concentration: 0.2 mol / L) aqueous solution, stir well to obtain a transparent solution; then slowly add 1 mol / L aqueous sodium hydroxide solution Add it dropwise to the above solution, and control the molar ratio of indium sulfate, cadmium chloride and sodium hydroxide to 1.8:1:8 to obtain a white colloidal suspension. Keeping it warm for 15 hours, cooling naturally to obtain a cadmium indium acid precipitate, washing the precipitate with deionized water three times, and drying to obtain a light yellow powder material.

[0027] Its X-ray diffraction pattern is as figure 1 As shown, it can be seen from the figure that the product is a pure-phase cadmium indium crystallite.

Embodiment 2

[0028] Embodiment 2, preparation cadmium indium acid octahedral crystallite

[0029] Add 9mL indium sulfate aqueous solution (concentration: 0.4mol / L) dropwise to 10mL cadmium chloride (concentration: 0.2mol / L) aqueous solution, stir well to obtain a transparent solution; then slowly add potassium hydroxide solution with a concentration of 1mol / L Add it dropwise to the above solution, and control the molar ratio of indium sulfate, cadmium chloride and potassium hydroxide to 1.8:1:8 to obtain a white colloidal suspension. Insulated for 15 hours, cooled naturally to obtain a precipitate, washed five times with deionized water, and dried to obtain a light yellow powder material.

[0030] The XRD ray diffraction pattern of the product and figure 1 Similarly, the product is shown to be phase-pure cadmium indate crystallites.

Embodiment 3

[0031] Embodiment 3, preparation cadmium indium acid octahedral crystallite

[0032] Add 9mL of indium sulfate solution (concentration: 0.4mol / L) dropwise into 10mL of cadmium nitrate (concentration: 0.2mol / L) solution, stir thoroughly to obtain a transparent solution, then slowly drop potassium hydroxide solution with a concentration of 1mol / L Add it to the above solution, control the molar ratio of indium sulfate, cadmium nitrate and potassium hydroxide to 1.8:1:8 to obtain a white colloidal suspension, move the suspension to a reaction kettle, and keep it warm at 260°C for 15 Hours, natural cooling to obtain a precipitate, the precipitate was washed 5 times with deionized water, and dried to obtain a light yellow cadmium indium acid microcrystalline powder material.

[0033] The XRD ray diffraction pattern of the product and figure 1 Similarly, the product is shown to be phase-pure cadmium indate crystallites.

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Abstract

The invention discloses a cadmium indiumate octahedron microcrystal and its preparation method. The method comprises the following steps of: (1) dissolving soluble indium salt and soluble cadmium salt in water to obtain a mixed solution; (2) adding a mineralizer into the mixed solution to obtain a gummy suspending liquid; and (3) moving the gummy suspending liquid into a reaction vessel to carry out hydrothermal reaction so as to obtain the cadmium indiumate octahedron microcrystal. According to the invention, the cadmium indiumate microcrystal with an octahedron microstructure and high cleanliness is obtained through the simple and low-cost hydrothermal reaction technology. The preparation method is simpler than a traditional solid-phase synthesis method, has advantages of low synthesis temperature and low production cost, and is used to achieve the microstructure which is difficult to realize by solid-phase synthesis. The structure is in favor of adsorption and desorption of a detected gas on the surface, and gas-sensitive characteristic of the prepared cadmium indiumate material is greatly raised.

Description

technical field [0001] The invention relates to a cadmium indium acid octahedral microcrystal and a preparation method thereof, belonging to the field of functional material science. Background technique [0002] The conductivity of semiconducting metal oxides is between conductors and insulators, and they are very sensitive to changes in external conditions such as light, electricity, heat, and magnetism. The conductivity of semiconductor metal oxides can be affected by gas molecules adsorbed on the surface, and the resistance will increase or decrease, which is the basis for the application of semiconductors in the field of gas sensing. The structural characteristics of semiconducting metal oxides, such as phase composition, dispersion, and morphology, will affect the gas sensing characteristics (sensitivity, selectivity, lifetime, etc.) of the sensor. Studies have found that the physical and chemical properties of gas-sensing materials are not only dependent on their siz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G15/00G01N27/00
Inventor 廖复辉刘艳丽黄富强
Owner PEKING UNIV
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