High-temperature enhanced upconversion fluorescence type nanocrystal for temperature sensing and preparation method and application thereof
A nanocrystalline and fluorescent technology, applied in the field of materials science, can solve problems such as inability to achieve accurate detection and the difference in the probability of transition to the ground state.
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Embodiment 1
[0015] Weigh 0.2 mmol of yttrium acetate hexahydrate with a purity of 99.9%, 0.196 mmol of ytterbium acetate hexahydrate, and 0.004 mmol of thulium acetate hexahydrate, and place them in a three-necked flask, add 3 ml of oleic acid with a purity of 90%, 1-octadecene 7 ml, stir and heat at 150°C for 30 minutes; after cooling to room temperature, add 4.3 ml of methanol mixed solution of sodium hydroxide and ammonium fluoride, heat up to 50°C and heat for 30 minutes; heat up to 100°C, and wait for methanol to evaporate , feed argon, continue to heat up to 290°C, keep warm for 90 minutes and then cool down; precipitate with acetone, centrifuge, wash twice with cyclohexane and ethanol; dry the obtained precipitate at 60°C for 12 hours.
[0016] The above-mentioned nanocrystalline powder is detected by X-ray electron diffraction and is hexagonal sodium tetrafluoroyttrium with good crystallinity, and observed by transmission electron microscope, it is spherical particles with an avera...
Embodiment 2
[0018] Weigh 0.236 mmol of yttrium chloride hexahydrate with a purity of 99.9%, 0.16 mmol of ytterbium chloride hexahydrate, and 0.004 mmol of thulium chloride hexahydrate, and place them in a three-necked flask, add 3 ml of oleic acid with a purity of 90%, 1-deca Octacene 7 ml, stir and heat at 150°C for 30 minutes; after cooling to room temperature, add 4.3 ml of methanol mixed solution of sodium hydroxide and ammonium fluoride, heat up to 50°C and heat for 30 minutes; heat up to 100°C, wait After the methanol is volatilized, argon gas is introduced, and the temperature is continuously raised to 300°C, kept for 60 minutes and then cooled; precipitated with acetone, centrifuged, and washed twice with cyclohexane and ethanol; the obtained precipitate is dried at 60°C for 12 hours.
[0019] The above-mentioned nanocrystalline powder is detected by X-ray electron diffraction and is hexagonal sodium tetrafluoroyttrium with good crystallinity, and observed by transmission electron ...
Embodiment 3
[0021]Weigh 0.24 mmol of yttrium acetate hexahydrate with a purity of 99.9%, 0.156 mmol of ytterbium acetate hexahydrate, and 0.004 mmol of thulium acetate hexahydrate, and place them in a three-necked flask, add 7 ml of oleic acid with a purity of 90%, 1-octadecene 7 ml, stir and heat at 150°C for 30 minutes; after cooling to room temperature, add 4.3 ml of methanol mixed solution of sodium hydroxide and ammonium fluoride, heat up to 50°C and heat for 30 minutes; heat up to 100°C, and wait for methanol to evaporate , feed argon, continue to heat up to 290°C, keep warm for 90 minutes and then cool down; precipitate with acetone, centrifuge, wash twice with cyclohexane and ethanol; dry the obtained precipitate at 60°C for 12 hours.
[0022] The above nanocrystalline powder is detected by X-ray electron diffraction and is a hexagonal sodium tetrafluoroyttrium with good crystallinity. It is a rod-like structure with an average width of 25 nm and an average length of 47 nm by trans...
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