A kind of tin dioxide nanoparticle gas-sensitive material and its preparation method and application
A nanoparticle and tin dioxide technology, which is applied in the analysis of materials, material analysis by electromagnetic means, and measurement devices, can solve the problems of complex operation and high synthesis cost of the synthesis method, and achieve the effect of simple operation and low synthesis cost
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[0038] A preparation method of tin dioxide nanoparticles, under weakly alkaline conditions, in a water / ethanol mixed solvent, using TA as an organic ligand and a polymer monomer, and formaldehyde as a crosslinking agent, covalently crosslinking TA into TA oligomers. Then add the metal ion Sn 2+ / Sn 4+ Further coordinate and cross-link with TA oligomers, assemble to form Sn-TA polymer nanoparticles, and then obtain tin oxide nanoparticles through roasting.
[0039] Concrete preparation method comprises the following steps:
[0040] (1) Fully dissolve TA in a mixed solvent of water and ethanol, adjust the pH value to 8-10 to obtain a transparent yellow solution, add a certain amount of formaldehyde solution, stir and react for 12-24 hours, and obtain TA oligomer;
[0041] (2) Add metal tin salt solution to the reaction system in step 1), stir and react for 12-24 hours, collect by centrifugation, and then roast in the air for 2-3 hours at a roasting temperature of 400°C to 700...
Embodiment 1
[0046](1) Accurately weigh 0.2g of tannic acid, add it to 5mL of ultrapure water and 45mL of absolute ethanol mixed solvent, add 0.35mL of ammonia water (25wt%) to adjust the pH to 8-10 after fully dissolving, then add 4mL of formaldehyde solution (3.7wt%) to obtain a yellow transparent solution, which was stirred and reacted for 24h.
[0047] (2) Accurately weigh 0.1gSnCl 4 ·5H 2 O, fully dissolved in 2 mL of absolute ethanol, added to the above solution, and continued to stir for 12 hours to obtain Sn-TA polymer nanoparticles.
[0048] (3) The samples were collected by centrifugation, and calcined in a muffle furnace for 3 h at a calcining temperature of 400° C. to obtain tin dioxide nanoparticles.
[0049] Such as figure 1 As shown, the tin dioxide nanoparticles prepared in this example have a smaller and uniform particle size.
[0050] Such as image 3 As shown, the tin dioxide nanoparticles prepared in this example have a higher specific surface area.
Embodiment 2
[0052] (1) Accurately weigh 2g of tannic acid, add it to 250mL of ultrapure water and 250mL of absolute ethanol mixed solvent, add 3.5mL of ammonia water (25wt%) to adjust the pH to 8-10 after fully dissolving, then add 40mL of formaldehyde solution (3.7wt%), a yellow transparent solution was obtained, and the reaction was stirred for 24h.
[0053] (2) Accurately weigh 1g of SnCl4·5H2O, fully dissolve in 20mL of absolute ethanol, add to the above solution, and continue to stir for 12h to obtain Sn-TA polymer nanoparticles.
[0054] (3) The samples were collected by centrifugation, and calcined in a muffle furnace for 3 h at a calcining temperature of 500° C. to obtain tin dioxide nanoparticles.
[0055] The gas sensing electrode was fabricated with tin dioxide nanoparticles and the gas sensing test was carried out.
[0056] Such as figure 1 As shown, the tin dioxide nanoparticles prepared in this example have a smaller and uniform particle size.
[0057] Such as figure 2 ...
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