Porous cobalt oxide nanowire, and preparation method and application thereof

A technology of cobalt trioxide nanometer and cobalt trioxide nanometer, which is applied in the field of nanomaterials, can solve the problems of surface conductivity change, low response sensitivity, high working temperature, etc., and achieve the effect of large choice, high gas sensitivity response selectivity and low cost

Active Publication Date: 2014-08-27
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, when cobalt tetroxide is used as a gas-sensing material, there are still shortcomings similar to other metal-oxide-semiconductor-type gas-sensing materials, such as low response sensitivity, poor selectivity, and high operating temperature.
On the one hand, this is because most metal oxide semiconductors have a large resistivity (usually greater than 10) at room temperature or near room temperature. 8 Ω cm), relatively small resistance changes are not easy to detect; on the other hand, many sensitive materials can only produce sufficient and effective active species on the surface at higher temperatures, causing changes in surface conductivity

Method used

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  • Porous cobalt oxide nanowire, and preparation method and application thereof
  • Porous cobalt oxide nanowire, and preparation method and application thereof
  • Porous cobalt oxide nanowire, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1: Using cobalt chloride as cobalt source

[0051] Dissolve and disperse 1.25mmol cobalt chloride and 1.25mmol urea in 40ml deionized water as solution A;

[0052] Dissolve and disperse 1.25 mmol of sodium fluoride in 40 ml of deionized water as solution B.

[0053] After mixing solution A and solution B uniformly, they were transferred to a 100ml hydrothermal kettle and allowed to stand at 120°C for 12 hours.

[0054] After natural cooling, the light pink flocculent precipitated product obtained after the reaction was separated by centrifugation, washed several times with water, and dried in an oven at 100°C. The obtained dry powder was slowly heated to a temperature of 1°C / min in a muffle furnace The product was calcined at 300°C for 3 hours at a constant temperature and cooled naturally.

[0055] The product was identified as cubic cobalt tetroxide by X-ray powder diffractometer (such as figure 1 Shown);

[0056] Use SEM (such as figure 2 Shown) and TEM (as image 3 ...

Embodiment 2

[0061] Example 2: Using cobalt nitrate as cobalt source

[0062] Dissolve and disperse 1.25mmol cobalt nitrate and 1.25mmol urea in 40ml deionized water as solution A;

[0063] 1.25mmol sodium fluoride was dissolved and dispersed in 40ml deionized water as solution B.

[0064] After mixing solution A and solution B uniformly, they were transferred to a 100ml hydrothermal kettle and reacted hydrothermally at 150°C for 2 hours. After natural cooling, the pale pink flocculent precipitated product obtained after the reaction was separated by centrifugation, washed several times with water, and dried in an oven at 100°C. The resulting dry powder was slowly heated to a temperature of 2°C / min in a muffle furnace After being calcined at 350°C for 2 hours at a constant temperature, the product was naturally cooled to obtain the product.

[0065] The X-ray powder diffraction spectrum is the same as in Example 1 (e.g. Picture 11 Shown);

[0066] Use SEM and TEM (respectively as Picture 12 with...

Embodiment 3

[0069] Example 3: Inorganic sodium carbonate as alkali source

[0070] Dissolve 1.25mmol cobalt chloride and 1.25mmol anhydrous sodium carbonate in 40ml deionized water as solution A;

[0071] 1.25mmol sodium fluoride was dissolved and dispersed in 40ml deionized water as solution B.

[0072] After mixing solution A and solution B uniformly, they were transferred to a 100ml hydrothermal kettle and allowed to stand at 140°C for 4 hours. After natural cooling, the light pink flocculent precipitated product obtained after the reaction was separated by centrifugation, washed several times with water, and dried in an oven at 100°C. The obtained dry powder was slowly heated to a temperature of 4°C / min in a muffle furnace After being calcined at 400°C for 1 hour at a constant temperature, the product was naturally cooled to obtain the product.

[0073] The X-ray powder diffraction spectrum is the same as in Example 1 (e.g. Figure 16 Shown);

[0074] Use SEM and TEM (respectively as Figure ...

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Abstract

The invention discloses a porous cobalt oxide nanowire, and a preparation method and application thereof. The tricobalt tetraoxide nanowire preparation method provided by the invention comprises the following steps: evenly mixing soluble inorganic cobalt salt, inorganic villiaumite, an alkali source and water, then performing hydrothermal reaction, collecting flocculent precipitate after the reaction is finished, and calcining to obtain the tricobalt tetraoxide nanowire. The surface fluorine-doped one-dimensional porous cobalt oxide nanowire provided by the invention has the advantages of novel and unique structure, wide raw material applicability, low cost and the like; and the method is simple, safe and easy to realize industrial production. The porous cobalt oxide nanowire can be widely used in gas-sensitive monitoring (inspection) of combustible, explosive and toxic carbon monoxide gas in the environment, and has wide application space.

Description

Technical field [0001] The invention belongs to the field of nano materials, and relates to a porous cobalt oxide nanowire and a preparation method and application thereof. Background technique [0002] One-dimensional nanostructured materials, because of their higher surface-to-body ratio, more exposed active sites and excellent physical properties, have broad application prospects in the fields of energy and environment. The one-dimensional porous surface fluorine ion-doped cobalt tetroxide nanowires of the present invention have both the good physical advantages of one-dimensional materials and the chemical advantages of large specific surface area of ​​porous materials and many active sites exposed. This one-dimensional porous structure is very conducive to the diffusion of gas molecules on the surface of the material and promotes the surface reaction; at the same time, the introduction of fluoride ion doping on the surface of the material can improve the electron transmissio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04B82Y30/00B82Y40/00G01N33/00
Inventor 宋卫国窦智峰曹昌燕
Owner INST OF CHEM CHINESE ACAD OF SCI
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