Less-layer hexagonal boron nitride nanosheet preparation method
A hexagonal boron nitride and nanosheet technology, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of uneven reaction time, small area of reaction products, and many influencing factors, and reduce the interaction force. , convenient for industrialization and application, and the effect of short preparation process
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[0024] see figure 1 , a method for preparing few-layer hexagonal boron nitride nanosheets provided by the embodiment of the present invention uses a freeze-drying method to recrystallize and synthesize a precursor to achieve high yield and large-scale preparation of large-area few-layer hexagonal boron nitride nanosheets, mainly Including raw material preparation, freeze-drying to prepare precursors and low-temperature sintering synthesis, the specific steps are as follows:
[0025] Raw material preparation: use boric acid as the boron source, urea as the nitrogen source, methanol aqueous solution as the dispersant, disperse boric acid and urea in the methanol aqueous solution at a molar ratio of 1:30-1:50, and stir to obtain a clear and transparent solution. Wherein, the boric acid is analytically pure boric acid, the urea is analytically pure urea, and the aqueous methanol solution is prepared from methanol and deionized water at a volume ratio of 1:1-1:3.
[0026] Preparat...
Embodiment 1
[0032] Raw material preparation: use boric acid as boron source, urea as nitrogen source, methanol aqueous solution as dispersant. Analytical pure boric acid and urea were weighed in a molar ratio of 1:30, and then dispersed in methanol aqueous solution, wherein methanol and deionized water were weighed in a volume ratio of 1:1. The mixture was further stirred to obtain a clear and transparent solution.
[0033] Precursor preparation: The obtained clear and transparent solution was pre-frozen at -80°C for 5 hours, then transferred to a freeze dryer, and freeze-dried at a cold trap temperature of -80°C for 24 hours to obtain a white crystalline precursor.
[0034] Low-temperature sintering synthesis: spread the obtained precursor in a quartz boat, then place the quartz boat in a horizontal tubular atmosphere furnace, raise the temperature to 900°C for 3 hours in an ammonia atmosphere, and finally cool the sample to room temperature with the furnace, that is Large-area and few-...
Embodiment 2
[0036] Raw material preparation: use boric acid as boron source, urea as nitrogen source, methanol aqueous solution as dispersant. Analytical pure boric acid and urea were weighed in a molar ratio of 1:40, and then dispersed in methanol aqueous solution, wherein methanol and deionized water were weighed in a volume ratio of 1:2. The mixture was further stirred to obtain a clear and transparent solution.
[0037]Precursor preparation: The obtained clear and transparent solution was pre-frozen at -80°C for 8 hours, then transferred to a freeze dryer, and freeze-dried at a cold trap temperature of -80°C for 36 hours to obtain a white crystalline precursor.
[0038] Low-temperature sintering synthesis: spread the obtained precursor in a quartz boat, then place the quartz boat in a horizontal tubular atmosphere furnace, raise the temperature to 1000°C for 4 hours in an ammonia atmosphere, and finally cool the sample to room temperature with the furnace, that is Large-area and few-...
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