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Preparation method of metal oxide suspension and method for spraying suspension to form high-specific-surface-area gas-sensitive coating under liquid material flame

A technology of oxides and suspensions, which is applied in the fields of engineering and material science, can solve the problems of good preservation and difficulty in hollow structural materials, and achieve the effects of low cost, large specific surface area, and excellent gas-sensing performance

Inactive Publication Date: 2019-06-07
扬州睿德石油机械有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problem that hollow structural materials are difficult to preserve intact in high-temperature and high-speed spraying flames, and proposes a simple, low-cost and large-scale industrial production method that can prepare hollow-shaped gas-sensitive coatings

Method used

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  • Preparation method of metal oxide suspension and method for spraying suspension to form high-specific-surface-area gas-sensitive coating under liquid material flame
  • Preparation method of metal oxide suspension and method for spraying suspension to form high-specific-surface-area gas-sensitive coating under liquid material flame
  • Preparation method of metal oxide suspension and method for spraying suspension to form high-specific-surface-area gas-sensitive coating under liquid material flame

Examples

Experimental program
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Effect test

Embodiment 1

[0030]1. Using alumina as the insulating matrix, the alumina flakes were placed in deionized water and ethanol in sequence, and assisted by ultrasonic waves, cleaned for 10 minutes, and dried for later use. Using the method of vacuum coating and metal mask pattern, a layer of chromium is firstly prepared to improve the bonding strength, and then a layer of gold is vapor-deposited on the front side of the aluminum oxide sheet to obtain interdigitated electrodes. On the opposite side of the aluminum oxide sheet, a layer of chromium is first prepared by vacuum coating to improve the bonding strength, and then a layer of platinum is evaporated on the front of the aluminum oxide sheet to obtain an interdigital heating electrode, that is, the sensor substrate 2 .

[0031] 2. Under magnetic stirring at 60°C, weigh DL-aspartic acid, dissolve it in deionized water and stir for 10 min, add PEG-4000 solution and continue stirring for 30 min. Then add In(NO 3 ) 3 The solution and urea...

Embodiment 2

[0035] The difference between this example and Example 1 is that the flow rate of the liquid material selected in step 3 is 40mL / min, preheating is carried out at 400 °C before spraying, the oxygen flow rate is adjusted to obtain a neutral flame, and the spraying distance is 250 mm. , the hollow micro-nano structure In with a thickness of 22 µm was prepared 2 o 3 coating. When the test condition is 25°C, the coating is resistant to 10 ppm NO 2 The sensitivity is 32.5.

Embodiment 3

[0037] The difference between this embodiment and Example 1 is that: 100 mL 0.3 mol / L Zn(NO 3 ) 3 solution. The flow rate of the liquid material selected in step 3 is 40mL / min, preheated at 500 °C before spraying, and the oxygen flow rate is adjusted to obtain an oxidation flame. When the spraying distance is 250 mm, a hollow micro-nano structure ZnO coating with a thickness of 25 μm is prepared. Floor. When the test conditions are room temperature, the coating is 10 ppm NO 2 The sensitivity is 26.8.

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Abstract

The invention discloses a preparation method of a metal oxide suspension capable of being applied to industrial production and a method for spraying the suspension to form a high-specific-surface-areagas-sensitive coating under a liquid material flame. The method utilizes a composite soft template method to synthesize a hollow spherical metal oxide suspension having hollow spherical morphology with a wall thickness thicker than that of a conventional hollow spherical morphology (structural strength of the hollow sphere is improved, and the intrinsic morphology after colliding with a substratecan be preserved), and the gas-sensitive coating is prepared by using the suspension as a liquid material and adopting a liquid material precursor flame spray (LPFS) technique with a milder flame speed and temperature. According to the method provided by the invention, the prepared gas-sensitive coating is a gas-sensitive coating having hollow spherical morphology, and has high sensitivity, faster response / recovery time and good long-term stability to a specific gas at under low temperature or even room temperature condition.

Description

technical field [0001] The invention discloses a method for preparing a metal oxide suspension applicable to industrial production and a method for forming a gas-sensitive coating with a high specific surface area by spraying the liquid material under a flame, belonging to the technical field of engineering and material science. Background technique [0002] Large amounts of nitrogen dioxide (NO2) emitted by industry and motor vehicles 2 ) is an important cause of various diseases. Currently commonly used gas analyzers are expensive, complex in structure and high in maintenance costs. Compared with gas analyzers, metal oxide semiconductor gas sensors have the advantages of small size, maintenance-free, and low cost, and are suitable for distributed large-area online monitoring. [0003] The fabrication of semiconducting metal oxide gas-sensing layers involves two typical steps: first, a sensing material with a specific morphology is synthesized by chemical synthesis method...

Claims

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Application Information

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IPC IPC(8): C01G15/00C01G9/02C01G49/06G01N27/12B05D1/10B82Y40/00
Inventor 张超孙东进刘贵方任永先朱敏山
Owner 扬州睿德石油机械有限公司
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