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Preparation method of nickel cobaltate/tungsten trioxide nanocomposite structure and its application in gas-sensitive coatings, components and sensors

A technology of tungsten trioxide and nanocomposite, applied in nickel oxide/nickel hydroxide, nickel compounds, chemical instruments and methods, etc., to achieve good selectivity, good reversibility, rapid and high-sensitivity detection

Active Publication Date: 2022-05-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although WO 3 to NO 2 Excellent sensing performance, but fast detection of NO with high response 2 still a challenge

Method used

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  • Preparation method of nickel cobaltate/tungsten trioxide nanocomposite structure and its application in gas-sensitive coatings, components and sensors
  • Preparation method of nickel cobaltate/tungsten trioxide nanocomposite structure and its application in gas-sensitive coatings, components and sensors
  • Preparation method of nickel cobaltate/tungsten trioxide nanocomposite structure and its application in gas-sensitive coatings, components and sensors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A nickel cobaltate / tungsten trioxide nanocomposite structure, the composite material is NiCo formed by orderly self-assembly of nanospheres 2 O 4 Nanoflower modified WO 3 nanoplates,

[0053] the WO 3 It is a nanoplate with a cubic phase crystal structure, and the surface is rough and has obvious cracks;

[0054] The NiCo 2 O 4 Nanomaterials are nanoflower-like spinel crystal structures composed of nanospheres.

[0055] the WO 3 The nanoplates have a length of 100-200 nm, a width of 100-200 nm and a thickness of 10-20 nm;

[0056] The NiCo 2 O 4 The diameter of the nanoflowers is 150–250 nm, and the NiCo 2 O 4 The diameter of the nanospheres is 30–50 nm.

[0057] A method for preparing a nickel cobaltate / tungsten trioxide nanocomposite structure,

[0058] ①Mix 0.60~0.75 g of NiCl 2 ·6H 2 O and 1.40~1.50 g of CoCl 2 ·6H 2 Put O into 60 mL of deionized water, stir vigorously for 10-20 min to completely dissolve it, add 0.50-0.6 g of urea and stir vigorous...

Embodiment 2

[0085] A gas-sensitive coating is NiCo assembled from nanospheres 2 O 4 Nanoflower modified WO 3 The gas sensor of the nanoplate, its structure diagram is as follows figure 1 shown in which the Ni-Cr heating wire 2 traverses the Al 2 O 3 Ceramic tube 1 and welded on the heating electrode of the hexagonal base, gold electrode 3 coated with Al 2 O 3 The outer surface of the ceramic tube 1 is welded to the measuring electrode of the hexagonal base through four platinum wires 4, and the gas-sensitive coating 5 is coated on the outer surface of the gold electrode 3 and the ceramic tube 1. The composition of the coating 5 is NiCo assembled from nanospheres 2 O 4 Nanoflower modified WO 3 Nanoplates, the WO 3 The nanoplate has a cubic phase crystal structure, the length of the nanoplate is 100-200 nm, the width is 100-200 nm, and the thickness is 10-20 nm. The NiCo 2 O 4 The nanoflower has a spinel crystal structure, the diameter of the nanoflower is 150-250 nm, and the dia...

Embodiment 3

[0100] A synthesis of NiCo assembled from nanospheres by secondary hydrothermal generation 2 O 4 Nanoflower modified WO 3 Preparation method and NO of nanoplate 2 Gas sensor, follow the steps below:

[0101] ①Mix 0.60 g NiCl 2 ·6H 2 O and 1.40 g CoCl 2 ·6H 2 O was placed in 60 mL of deionized water, and after vigorous stirring for 10 min to completely dissolve it, 0.50 g of urea was added and vigorously stirred for 0.5 h.

[0102] ② Put the precursor solution obtained in step ① in a 100 mL PTFE autoclave at 100 o After heating at C for 10 h, a lavender precipitated product was obtained.

[0103]③ Wash the lavender precipitated product obtained in step ② alternately with deionized water and absolute ethanol for 6 times, and at 60 o Dry at C for 8 h, and then place the dried product at 300 o Heat treatment at C for 1 h.

[0104] ④The NiCo obtained in step ③ 2 O 4 Nanoflower and 1.0 g Na 2 WO 4 ·2H 2 O, 1.5 mL of lactic acid was added to 50 mL of deionized water, ...

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Abstract

The invention relates to the technical field of gas-sensitive materials, in particular to a preparation method of a nickel cobaltate / tungsten trioxide nanocomposite structure and its application in gas-sensitive coatings, components and sensors. The present invention adopts secondary hydrothermal method, NiCl 2 ·6H 2 O, CoCl 2 ·6H 2 O and urea were added to deionized water and heated at 100–160°C for 10–15 hours, and then the obtained purple precipitate was calcined in an air environment at 300–400°C for 1–3 hours to obtain NiCo nanospheres self-assembled. 2 o 4 nanoflowers; the NiCo 2 o 4 Nanoflowers, Na 2 WO 4 2H 2 Add O and lactic acid to deionized water, adjust the pH value of the mixed solution to 2-4 with HCl solution, react at a constant temperature of 100-150°C for 12-18 hours, and then calcinate at 450-550°C for 1-3 hours to obtain NiCo 2 o 4 Nanoflower modified WO 3 nanoplate. This NiCo 2 o 4 Nanoflower modified WO 3 The nano plate is coated on the gold electrode on the outer surface of the ceramic tube, and then the gas sensor is prepared through aging treatment. The gas sensor is prepared based on the method of the present invention, which can realize the detection of low concentration NO 2 High sensitivity, high selectivity, fast response at low working temperature.

Description

technical field [0001] The invention relates to the technical field of gas-sensing materials, in particular to a preparation method of a nickel cobaltate / tungsten trioxide nanocomposite structure and its application in gas-sensing coatings, elements and sensors. Background technique [0002] NO 2 It is a colorless, flammable, toxic and irritating gas that is considered by the World Health Organization (WHO) as one of the most dangerous and common air pollutants. Among them, man-made nitrogen dioxide from chemical fuel combustion, waste incineration and vehicle exhaust accounts for two-thirds of its total emissions. It reacts with other pollutants or water, causing acid rain, smog and air pollution. Prolonged exposure to the gas can irritate the respiratory system, leading to nose and throat discomfort, fatigue, and nausea. In severe cases, it can cause emphysema, asthma, bronchitis and lung cancer. Some studies have linked breast cancer risk to atmospheric NO 2 There is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12C09D1/00C01G53/00C01G53/04C01G41/02
CPCG01N27/125G01N27/127C09D1/00C01G53/00C01G53/04C01G41/02C01P2004/64C01P2004/62C01P2004/32C01P2004/82Y02E60/10
Inventor 张冬至李停停胡雅晴王微微王东岳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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