Nickel-doped tin oxide nano-material, formaldehyde gas sensor, and preparation method

A nano-material and tin oxide technology, applied in the field of gas sensing, can solve the problems of low formaldehyde response sensitivity, substandard detection limit, high working temperature, etc., achieve great application prospects, reduce preparation costs, and low working temperature

Active Publication Date: 2018-03-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the existing tin dioxide semiconductor gas sensor has low response sensitivity to formaldehyde, poor selectivity, substandard detection limit and high working temperature

Method used

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  • Nickel-doped tin oxide nano-material, formaldehyde gas sensor, and preparation method
  • Nickel-doped tin oxide nano-material, formaldehyde gas sensor, and preparation method
  • Nickel-doped tin oxide nano-material, formaldehyde gas sensor, and preparation method

Examples

Experimental program
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Embodiment 1

[0060] Embodiment 1, the preparation of nickel-doped tin oxide nanomaterial

[0061] Step 1, weighing 3.0 g of oxalic acid dihydrate and 226 mg of stannous chloride dihydrate (1 mmol) were added to water: 60 mL of anhydrous ethanol mixed solvent of 1:1, stirred until the solid dissolved and the solution became clear;

[0062] Step 2, weighing 11.9 mg of nickel chloride hexahydrate (0.05 mmol) and 1.0 g of polyvinylpyrrolidone into the solution obtained in step 1, and stirring to obtain a mixed solution;

[0063] Step 3, heating the mixed solution obtained in the above steps to 200°C for 12 hours, cooling down to room temperature, washing with deionized water and ethanol alternately, and then centrifuging at a centrifugal speed of 8000rpm for 10min to obtain crude nickel-doped tin oxide nanoparticles ;

[0064] Step 4, dry the crude nickel-doped tin oxide nanoparticles in an oven at 60°C for 24 hours, put the dried solid in a high-temperature crucible, set the muffle furnace t...

Embodiment 2

[0066] Embodiment 2, the preparation of nickel-doped tin oxide nanomaterial

[0067] Step 1, weighing 3.0 g of oxalic acid dihydrate and 226 mg of stannous chloride dihydrate (1 mmol) were added to water: 60 mL of anhydrous ethanol mixed solvent of 1:1, stirred until the solid dissolved and the solution became clear;

[0068] Step 2, weighing 2.4mg of nickel chloride hexahydrate (0.01mmol) and 1.0g of polyvinylpyrrolidone into the solution obtained in step 1, and stirring to obtain a mixed solution;

[0069] Step 3, heating the mixed solution obtained in the above steps to 160°C for 48 hours, cooling down to room temperature, washing with deionized water and ethanol alternately, and then centrifuging at a centrifugal speed of 5000 rpm for 20 minutes to obtain crude nickel-doped tin oxide nanoparticles ;

[0070] Step 4: Dry the crude nickel-doped tin oxide nanoparticles in an oven at 80°C for 18 hours, put the dried solid in a high-temperature crucible, set the muffle furnace...

Embodiment 3

[0071] Embodiment 3, the preparation of nickel-doped tin oxide nanomaterial

[0072] Step 1, weighing 3.0 g of oxalic acid dihydrate and 226 mg of stannous chloride dihydrate (1 mmol) were added to water: 60 mL of anhydrous ethanol mixed solvent of 1:1, stirred until the solid dissolved and the solution became clear;

[0073] Step 2, weighing 6.00 mg of nickel chloride hexahydrate (0.025 mmol) and 1.0 g of polyvinylpyrrolidone into the solution obtained in step 1, and stirring to obtain a mixed solution;

[0074] Step 3: Warm up the mixed solution obtained in the above steps to 240°C for 10 hours, cool down to room temperature, wash alternately with deionized water and ethanol, and then centrifuge at a centrifugal speed of 10,000 rpm for 5 minutes to obtain crude nickel-doped tin oxide nanoparticles ;

[0075] Step 4, dry the crude nickel-doped tin oxide nanoparticles in an oven at 100°C for 5 hours, put the dried solid in a high-temperature crucible, set the muffle furnace t...

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Abstract

The invention discloses a nickel-doped tin oxide nano-material which includes nickel-doped tin dioxide nano-particles, wherein atomic number percentage of doped nickel is 0.1-10%, and the particle size of the nano-particles is not more than 250 nm, the surfaces of the nano-particles are rough ellipsoid shaped. The invention also provides a preparation method and an application of the nickel-dopedtin oxide nano-material, and provides a formaldehyde gas sensor comprising the same, and a preparation method and an application thereof. The nickel-doped tin oxide nano-material and the nickel-dopedtin oxide-based formaldehyde gas sensor have high responding speed and sensitivity, good selectivity, low work temperature, ultra-low detection limit and good long-time stability.

Description

technical field [0001] The invention relates to the technical field of gas sensing, in particular to a nickel-doped tin oxide nanomaterial, a formaldehyde gas sensor and a preparation method. Background technique [0002] Formaldehyde is a colorless, flammable, strong-smelling substance commonly found in building materials and household products. Typical sources of formaldehyde in the home include stamped wood products, smoking and burning equipment. When the concentration of formaldehyde in the air exceeds 0.1ppm (0.1 parts per million parts of formaldehyde in the air), some people may have various short-term adverse reactions, such as tearing, burning sensation in the eyes, nose and throat, coughing, wheezing, nausea and skin corrosion. Factory workers, laboratory personnel, and certain medical staff may be exposed to higher concentrations of formaldehyde than the general public for a long time, and face greater health risks. At present, formaldehyde has been listed as ...

Claims

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Application Information

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IPC IPC(8): C01G19/02C01G53/04G01N27/00G01N33/00
CPCC01G19/02C01G53/04C01P2004/03C01P2004/32C01P2004/62G01N27/00G01N33/0047
Inventor 杨志胡骏胡南滔苏言杰周志华张亚非
Owner SHANGHAI JIAO TONG UNIV
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