Air-sensitive material for detecting oxymethylene and air-sensitive device made from the material
A gas-sensing material, formaldehyde gas technology, applied in the direction of material resistance, etc., can solve the problems of gas-sensing material poisoning, affecting the stability of components, short response and recovery time, etc., to achieve the effect of sensitive detection and accurate results
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Embodiment 1
[0028] In a 250ml three-neck flask, add 125ml of absolute ethanol and 3g of zinc acetate dihydrate, slowly raise the temperature and stir to mix and dissolve to obtain a colorless and transparent solution A. The reaction temperature is controlled between 60°C and 80°C. Dissolve 55ml of 0.5mol / L sodium hydroxide into 70ml of absolute ethanol solution, put it into a constant pressure funnel, slowly drop it into solution A, and stir vigorously during the dropping process to make the solution transparent and clear. After the dropwise addition, the reaction was continued at 60° C. to 80° C. for 3 hours to obtain milky white ZnO sol solution B. Then use a centrifuge at a speed of 5500r / min to precipitate the ZnO particles in the ZnO sol solution, separate the ZnO precipitate, and wash it repeatedly with absolute ethanol for 5-10 times. Then vacuum-dry it at 80° C., take it out and grind it into a powder, and finally place it in a muffle furnace for sintering at 500° C. for 1 hour an...
Embodiment 2
[0033] In a 500ml three-neck flask, add 250ml of absolute ethanol and 6g of zinc acetate dihydrate, slowly raise the temperature and stir to mix and dissolve to obtain a colorless and transparent solution A, and the reaction temperature is controlled between 60°C and 80°C. Dissolve 110ml of 0.5mol / L sodium hydroxide into 140ml of absolute ethanol solution, put it into a constant pressure funnel, slowly drop it into solution A, and stir vigorously during the dropping process to make the solution transparent and clear. After the dropwise addition, the reaction was continued at 60° C. to 80° C. for 3 hours to obtain milky white ZnO sol solution B. Then use a centrifuge at a speed of 5500r / min to precipitate the ZnO particles in the ZnO sol solution, separate the ZnO precipitate, and wash it repeatedly with absolute ethanol for 5-10 times. Then vacuum-dry it at 80°C, take it out and grind it into a powder, and finally place it in a muffle furnace for sintering at 500°C for 1 hour ...
Embodiment 3
[0038] In a 500ml three-neck flask, add 378ml of absolute ethanol and 9g of zinc acetate dihydrate, slowly heat up and stir to mix and dissolve to obtain a colorless and transparent solution A, and the reaction temperature is controlled between 60°C and 80°C. Dissolve 165ml of 0.5mol / L sodium hydroxide into 210ml of absolute ethanol solution, put it into a constant pressure funnel, slowly drop it into solution A, and stir vigorously during the dropping process to make the solution transparent and clear. After the dropwise addition, the reaction was continued at 60° C. to 80° C. for 3 hours to obtain milky white ZnO sol solution B. Then use a centrifuge at a speed of 5500r / min to precipitate the ZnO particles in the ZnO sol solution, separate the ZnO precipitate, and wash it repeatedly with absolute ethanol for 5-10 times. Then it was vacuum-dried at 80° C., taken out and ground into a powder, and finally placed in a muffle furnace for sintering at 500° C. for 1 hour, and then ...
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