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Precious metal-doped WO3 gas-sensitive coating and preparation method thereof

A precious metal and coating technology, which is applied in the direction of metal material coating process, coating, molten spraying, etc., can solve the problems of difficult delivery of solid nano powder, limitation of gas sensitivity characteristics, cumbersome process, etc., and reduce the spray granulation process , Improve the gas sensitivity, the effect of high sensitivity advantages

Active Publication Date: 2015-01-14
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

Plasma spraying technology is an important thermal spraying technology and an effective nano-coating preparation technology; however, because solid nano-powders are difficult to transport and easy to burn, nano-powders are not suitable for direct use as plasma spraying raw materials
In the process of preparing nano-coatings by traditional plasma spraying, the process route of "nano-powder raw materials → primary granulation of agglomerated micron powder → secondary granulation of spray powder densification → plasma coating preparation" is often followed. Not only the cost is high, the process is cumbersome, and the operability is poor, but also the nano powder in each step of the process environment has different degrees of loss
In addition, in the secondary granulation process of densification, due to the high temperature, the nano-powder grains tend to grow or grow beyond the nano-critical size, which in turn affects various excellent properties of the nano-coating.
Therefore, WO prepared by traditional thermal spraying method 3 Gas-sensitive coatings are often micron-sized surface structures, and the specific surface area of ​​the coating is low, making WO 3 The play of gas-sensing characteristics is greatly limited

Method used

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  • Precious metal-doped WO3 gas-sensitive coating and preparation method thereof
  • Precious metal-doped WO3 gas-sensitive coating and preparation method thereof
  • Precious metal-doped WO3 gas-sensitive coating and preparation method thereof

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Embodiment 1

[0032] In this embodiment, the base material is selected as a stainless steel sheet with a thickness of about 2mm, and 0.06wt% nanometer Au is doped with WO on the base. 3 The thickness of the coating prepared by the liquid material is 5 μm, and the coating is submicron-sized WO 3 A porous surface made of stacked crystal grains, where WO 3 The grain size ranges from 50 to 150nm. The ultrathin porous submicron structured Au-doped WO 3 The coating preparation process is as follows figure 1 As shown, the specific preparation method is as follows:

[0033] 1. Mix deionized water and absolute ethanol at a volume ratio of 1:1 to make a solution, add 0.08wt% surfactant polyethylene glycol PEG20000, and commercially available pure WO 3 Nano-powder (particle size: 50nm) and Au nano-powder (particle size: 5-15nm) are added to the prepared solution above, and the WO 3 The solid content is 10wt%, and the Au doping amount is 0.06wt% spray liquid material;

[0034] 2. Clean the substr...

Embodiment 2

[0042] In this embodiment, the base material is selected as a 304 stainless steel sheet with a thickness of about 2mm, and 0.06wt% nanometer Au is doped with WO on the base. 3 The thickness of the coating prepared by the liquid material is 20 μm, and the coating is submicron-sized WO 3 A porous surface made of stacked crystal grains, where WO 3 The grain size ranges from 50 to 250nm. The ultrathin porous submicron structured Au-doped WO 3 The coating preparation process is as follows figure 1 As shown, the specific preparation method is as follows:

[0043] 1. Mix deionized water and absolute ethanol at a volume ratio of 1:2 to make a solution, add 0.10wt% surfactant polyethylene glycol PEG20000, and commercially available pure WO 3 Nano-powder (particle size: 50nm) and Au nano-powder (particle size: 5-15nm) are added to the prepared solution above, and the WO 3 The solid content is 15wt%, the Au doping amount is the spraying liquid material of 0.06wt%;

[0044] 2. Clean...

Embodiment 3

[0052] In this embodiment, the base material is selected to be Al with a thickness of about 2 mm. 2 o 3 Ceramic sheet, 0.012wt% nano-Pt doped WO on the substrate 3 The thickness of the coating prepared by the liquid material is 15 μm, and the coating is submicron-sized WO 3 A porous surface made of stacked crystal grains, where WO 3 The grain size ranges from 50 to 250nm. The ultrathin porous submicron-structured Pt-doped WO 3 The coating preparation process is as follows figure 1 As shown, the specific preparation method is as follows:

[0053] 1. Mix deionized water and absolute ethanol at a volume ratio of 1:4 to make a solution, add 0.08wt% surfactant polyammonium methacrylate, and commercially available pure WO 3 Nano-powder (particle size: 50nm) and Pt nano-powder (particle size: 5-10nm) are added to the prepared solution above, and the WO 3 Solid content is 10wt%, and the spraying liquid material that Pt doping amount is 0.012wt%;

[0054] 2. Clean the substrate...

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Abstract

The invention discloses a precious metal-doped WO3 coating having an ultrathin porous submicron structure and a preparation method thereof. The preparation method comprises depositing a precious metal nanoparticle-doped WO3 suspension liquid as a spraying raw material on a matrix by a thermal spraying technology to obtain the precious metal-doped WO3 coating having thickness of 5-20 microns and a porous submicron structure. The precious metal-doped WO3 coating has precious metal content of 0.067-2.440wt%. The precious metal-doped WO3 coating has a high specific surface area and through use of the precious metals, the gas-sensitive characteristics of the precious metal-doped WO3 coating are effectively improved. The preparation method adopts simple equipment, has simple and easily-controllable processes, has high deposition efficiency and a low cost, is suitable for industrial production and can produce large social and economic benefits.

Description

technical field [0001] The present invention relates to substrate surface WO 3 The field of coating technology, especially relates to a noble metal doped WO 3 Gas-sensitive coating and its preparation method. Background technique [0002] With the rapid development of my country's economy and the deepening of industrialization, the urban population and the number of motor vehicles have increased sharply. x , CO 2 , SO 2 、H 2 The emission of gases such as S causes air pollution, leading to acid rain and the greenhouse effect. In order to monitor such flammable, explosive, poisonous and harmful gases, gas sensors with high sensitivity and good selectivity are required. In addition, in the food industry and home appliance applications, the gas sensor can be used for quality inspection, production process control and gas leakage alarm. [0003] WO 3 As a transition metal oxide semiconductor material, it is a wide-bandgap n-type semiconductor with excellent gas-sensing pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/10C23C4/11C23C4/134
Inventor 黄晶袁建辉李华
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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