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An oxide nanoparticle doped wo 3 Gas sensitive coating and its preparation method

A technology of nano-particles and oxides, which is applied in coatings, metal material coating processes, fusion spraying, etc., can solve the problems of less gas-sensitive coating preparation, overcome difficulties in direct spraying, improve sensitivity, and process The effect of less process

Active Publication Date: 2017-06-27
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, plasma spraying of liquid phase precursors at home and abroad is mainly concentrated in the field of preparation of nano-zirconia thermal barrier coatings. 3 Preparation of gas-sensitive coatings involves less

Method used

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  • An oxide nanoparticle doped wo <sub>3</sub> Gas sensitive coating and its preparation method
  • An oxide nanoparticle doped wo <sub>3</sub> Gas sensitive coating and its preparation method
  • An oxide nanoparticle doped wo <sub>3</sub> Gas sensitive coating and its preparation method

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Embodiment 1

[0035] In this embodiment, the selected substrate material is a glass sheet with a thickness of about 1 mm, and the nanometer Al on the substrate is 2 o 3 Particle doped WCl 6 The thickness of the coating prepared by liquid material is about 500nm, in which Al 2 o 3 with WCl 6 The mass ratio is 1:20, the coating is WO 3 A porous surface made of stacked crystal grains, where WO 3 The grain size ranges from 10 to 50 nm. The porous submicron structure of Al 2 o 3 doped WO 3 The coating preparation process is as follows figure 1 As shown, the specific preparation method is as follows:

[0036] 1. First, commercially available WCl 6 Add it into absolute ethanol and stir evenly, ultrasonically disperse for 60min, at the same time add 0.06wt% surfactant polyethylene glycol (PEG600) into deionized water, stir it evenly, add it to WCl 6 in anhydrous ethanol solution, and ultrasonically dispersed for 40min to obtain WCl 6 A solution with a solid content of 4%, wherein deion...

Embodiment 2

[0044] In this embodiment, the substrate is Al with a thickness of about 1mm 2 o 3 sheet, the substrate surface WO 3 The thickness of the coating is about 600nm, and the coating is well combined with the substrate; the surface of the coating is made of WO 3 The crystal grains are piled up, and the grain size ranges from 10 to 30 nm. The porous submicron size WO 3 The specific preparation method of the coating is as follows:

[0045] 1. First, commercially available WCl 6 Add it into absolute ethanol and stir evenly, ultrasonically disperse for 30min, and at the same time add 0.06wt% surfactant polyethylene glycol 20000 into deionized water, stir it evenly and add it to WCl 6 in anhydrous ethanol solution, and ultrasonically dispersed for 30 minutes to obtain WCl 6 A solution with a solid content of 4%, wherein deionized water and absolute ethanol are in a volume ratio of 1:1, and then the pH of the above solution is adjusted to 7 with ammonia under the condition of magne...

Embodiment 3

[0054] In this embodiment, the substrate is a glass slide with a thickness of about 1mm, and the surface of the substrate is WO 3 The thickness of the coating is about 500nm, and the coating is well combined with the substrate; the surface of the coating is made of WO 3 The crystal grains are piled up, and the grain size ranges from 10 to 40 nm. The WO of the porous submicron structure 3 The specific preparation method of the coating is as follows:

[0055] 1. First, commercially available WCl 6 Add it into absolute ethanol and stir evenly, ultrasonically disperse for 40min, and at the same time add 0.06wt% surfactant cetyltrimethylammonium bromide into deionized water, stir it evenly, add it to WCl 6 in anhydrous ethanol solution, and ultrasonically dispersed for 40min to obtain WCl 6 A solution with a solid content of 4%, wherein deionized water and absolute ethanol are in a volume ratio of 1:1, and then the pH of the above solution is adjusted to 7 with ammonia under th...

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Abstract

The invention discloses an oxide nanoparticle doped WO3 gas sensitive coating and a preparation method thereof. The oxide nanoparticle doped WO3 gas sensitive coating is prepared by the following steps: by using an oxide nanoparticle doped WC16 solution as a spraying raw material, spraying and precipitating the spraying raw material on a base body by virtue of a thermal spraying process to obtain the oxide nanoparticle doped WO3 gas sensitive coating with the grain size of 10-50nm, wherein the mass ratio of oxide nanoparticles to WC16 is 1:(5-100). The invention provides the preparation method of the oxide nanoparticle doped WO3 gas sensitive coating. The preparation method has the advantages of few process flows, low cost and the like, is simple to operate and suitable for industrialized production. The thickness range of the prepared gas sensitive coating is 200nm to 1 mu m. The gas sensitive layer has a porous structure, and the grain size of WO3 in the gas layer is 10-50nm, so that the requirement on the high specific surface area of the WO3 coating in the field of gas sensitive sensors can be satisfied, and thus the application of the coating in the field of gas sensors is facilitated.

Description

technical field [0001] The present invention relates to semiconducting metal oxide WO 3 The field of coating technology, especially relates to a kind of oxide nanoparticle doped WO prepared by thermal spraying technology 3 Gas-sensitive coating and its preparation method. Background technique [0002] With the rapid development of my country's economy, the extensive use of industrial fossil fuels and automobiles has led to NO x , CO x , SO 2 、H 2 S, NH 3 The emission of gases such as air pollution caused air pollution, acid rain and greenhouse effect, and at the same time constituted a certain harm to people's health. In order to better monitor such flammable, explosive, toxic and harmful gases, it is urgent to develop gas sensors and related equipment with high sensitivity and good selectivity. Metal-oxide-semiconductor gas sensors have attracted the attention of researchers due to their high sensitivity and selectivity, low cost, simple operation, and portability. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/11
Inventor 武庆飞黄晶王成陈鹏李华
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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