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以硫酸铝铵、尿素为原料,PEG2000作为分散剂,通过水热法合成了三种形貌的勃姆石(AlOOH)。实验结果显示,调节水热温度可以制备出AlOOH微球、微纤维和3D分级结构的AlOOH。经SEM分析可知,在煅烧过程中,AlOOH分解转化为γ-Al2O3,该过程为拓扑过程,即形貌未发生变化。TEM结果显示,介孔均匀地分布在AlOOH内。基于此,我们提出了温度-形貌生长机制。此外,还研究了γ-Al2O3的光致发光性能,以325 nm为激发光谱时,其发生光谱的波长在380~500 nm,光谱中心在409和467 nm处。
Three kinds of morphologies of boehmite (AlOOH) were synthesized by hydrothermal method using aluminum ammonium sulfate and urea as raw materials and PEG2000 as dispersant. The experimental results show that AlOOH microspheres, microfibers and 3D AlOOH can be prepared by adjusting the hydrothermal temperature. SEM analysis shows that during the calcination process, AlOOH decomposes and converts into γ-Al2O3, which is a topological process, that is, the morphology does not change. TEM results show that the mesopores are uniformly distributed in the AlOOH. Based on this, we propose a temperature-topography growth mechanism. In addition, the photoluminescence properties of γ-Al2O3 were also studied. When the excitation wavelength is 325 nm, the wavelength of the generated spectrum is between 380 and 500 nm and the center of the spectrum is at 409 and 467 nm.