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Synthetic method of tungsten oxide nano-wires for preparing gas sensitive sensors

A technology of tungsten oxide nanowires and gas sensor, which is applied in the field of synthesis of tungsten oxide nanowires, can solve problems such as easy residue of organic matter and impact on gas sensing performance, and achieve high crystallization degree, high safety, and easy promotion effect

Inactive Publication Date: 2017-03-29
CHINESE ACAD OF INSPECTION & QUARANTINE
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Problems solved by technology

However, the above-mentioned methods usually require relatively harsh reaction conditions, which are obtained through complicated reaction steps, and are usually reacted in an organic solvent system, and surfactants are also required as structure-directing agents, which cause the material to show that organics are easy to remain, which is harmful to gas. Sensitivity can have serious effects

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  • Synthetic method of tungsten oxide nano-wires for preparing gas sensitive sensors
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  • Synthetic method of tungsten oxide nano-wires for preparing gas sensitive sensors

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preparation example Construction

[0027] The synthesis method for preparing the tungsten oxide nanowires of the gas sensor of the present invention, the specific synthesis steps include:

[0028] (1) Tungsten hexachloride is placed in dehydrated alcohol;

[0029] Dissolve a predetermined amount of tungsten hexachloride in absolute ethanol, the mass ratio of ethanol to tungsten hexachloride is 1000:0.5~20, stir on a magnetic stirrer for 0.5~1 hour, after completely dissolving, light green hexachloride is obtained. Tungsten chloride alcohol solution;

[0030] (2) After stirring evenly, the formed light green tungsten hexachloride alcohol solution is transferred to a stainless steel hydrothermal reaction kettle, and the reaction is carried out at a predetermined temperature for a predetermined time, so that the tungsten hexachloride is completely converted into tungsten oxide;

[0031] Transfer the obtained light green tungsten hexachloride alcohol solution into a stainless steel hydrothermal reaction kettle wit...

Embodiment 1

[0041] Weigh 0.3g of tungsten hexachloride, put it in 100mL of absolute ethanol, stir with a magnetic stirrer for half an hour, completely dissolve the tungsten hexachloride, and obtain a light green alcohol solution of tungsten hexachloride. The alcohol solution was transferred to a polytetrafluoroethylene-lined stainless steel hydrothermal reaction kettle, sealed with a cover, placed in an oven, and heated at 180°C for 24 hours. After the reaction, the obtained product was transferred to a centrifuge tube, centrifuged at 8000 rpm for 10 minutes, and the upper layer liquid was discarded. The centrifuged product was ultrasonically cleaned with ethanol for 10 minutes, centrifuged at a speed of 8000 rpm for 10 minutes, the supernatant was discarded, and the washing was repeated once. Ultrasonic washing was performed twice with excess deionized water, and the washed blue solid product was vacuum-dried. After the obtained product is characterized by SEM, XRD, TEM and EDX, it is d...

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Abstract

The invention belongs to the technical field of inorganic nano-materials, and relates to a synthetic method of tungsten oxide nano-wires for preparing gas sensitive sensors. The synthetic method includes the steps: (1) placing tungsten hexachloride into absolute ethyl alcohol; (2) uniformly stirring the tungsten hexachloride, transferring formed light-green tungsten hexachloride alcoholic solution into a stainless steel hydrothermal reaction kettle, performing reaction of predetermined time at the predetermined temperature, and enabling the tungsten hexachloride to convert into tungsten oxide; (3) centrifuging solution of the tungsten oxide obtained by reaction, and ultrasonically cleaning reactants by the aid of ethyl alcohol and water; (4) drying obtained tungsten oxide nano-wires in a vacuum drying oven for 1-2 hours at the temperature ranging from 40 DEG C to 60 DEG C to obtain the tungsten oxide nano-wires. The synthetic method has the advantages that other organic solvents and surface active agents are omitted, so that materials have good purity, subsequent purification is omitted, the tungsten oxide nano-wires have reducibility and the advantages of high safety, high in operability and easiness in popularization, and the obtained materials have high crystallizing degree.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanometer materials, and relates to a synthesis method for preparing tungsten oxide nanowires of a gas sensor. Background technique [0002] The rapid development of modern chemical technology has greatly improved people's living standards. However, with the rapid development of heavy industries such as petroleum, chemical industry, coal, and metallurgy, more and more industrial waste gases (such as CO 2 , NO 2 , NH 3 、H 2 S, etc.) and volatile organic compounds (such as formaldehyde, ethanol, acetone, etc.) are discharged into the atmosphere, causing environmental pollution that cannot be ignored, such as ozone layer depletion, greenhouse effect and acid rain, which seriously threaten the environment and personal safety. The rapid and accurate detection of dangerous gases in the environment is undoubtedly the key link to solve the problem of gas pollution and protect human health and safety...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/02B82Y40/00B82Y30/00G01N27/00
CPCC01G41/02B82Y30/00B82Y40/00C01P2002/72C01P2002/84C01P2004/03C01P2004/04C01P2004/16C01P2004/64G01N27/00
Inventor 钟坚海席广成白桦
Owner CHINESE ACAD OF INSPECTION & QUARANTINE
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