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Synthesis and Characterion of BN and AlN Nanocrystals

Author: FengXieLi
Tutor: GaoFaMing
School: Yanshan University
Course: Chemical processes
Keywords: Solvothermal Boron nitride Aluminum nitride Modifier Photoluminescence Nanocrystals
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 114
Quote: 0
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Abstract


BN and AlN nanomaterials with a series of excellent physical and chemical properties, and become a popular material for the current world research. The commonly used method for preparing complex process, the reaction temperature is high, difficult to control; some require expensive equipment. To solve this problem, the paper selection Solvothermal method of BN and AlN nanomaterials prepared under relatively mild conditions. The reaction was loaded in a glove box filled with nitrogen stainless steel autoclave, the release resistance furnace constant heating, and then cooled to room temperature, and finally after the appropriate product to obtain BN and AlN nanocrystalline. And X-ray powder diffraction, infrared absorption spectra and selected area electron diffraction method to analyze the structure and composition of the nanocrystals; observed by transmission electron microscopy, the particle size and morphology of the microcrystalline using photoluminescence spectroscopy to test a sample optical properties. Acetonitrile as the organic reaction solvent, in the the 400 ℃ relatively mild conditions, three different experimental program were synthesized h-BN. The research shows that the choice of the different sources of nitrogen and boron source crystal morphology of the product. When NaN3 and BBr3 as reactants, synthetic whisker form h-BN microcrystalline; when NaN3 and B powder as a reactant in the same experimental conditions, synthetic is whisker-like, particle, sheet h-BN microcrystalline variety of shape and similar tubular, and the crystallization effect is stronger than the former; when to KHB, NH4Cl, and a small amount of Li3N reactant, synthetic particles h-BN microcrystalline. Furthermore, the light luminescent view of (PL) spectra show, the above-mentioned preparation of h-BN having a different emission peak, but a strong emission peak at 580 nm (λ = 325 nm) at the same time, the occurrence of a significant red shift. Xylene is an organic reaction solvent, 400 ℃ under relatively mild conditions, the use of three different experimental program were given a h-AlN nanocrystals. By a variety of analytical methods that, when treated with sodium azide as the nitrogen source, the product is mainly particles nanocrystalline crystal and adding the appropriate modifier of cetyl trimethyl ammonium bromide (CTAB) crystallization effect; same experimental conditions, when the lithium nitride as a nitrogen source, and the product is massive and nanoparticle crystallite. Three scenarios prepared by light EL spectra test h-AlN nanocrystals emission peak at 440 nm (λ = 290 nm) of the blue region. Have shown a certain degree of optical performance.

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