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首页> 外文期刊>Applied Surface Science >SEM/TEM characterization of periodical novel amorphousano-crystalline micro-composites obtained by laser interference structuring: The system HAlO-Al·Al_2O_3
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SEM/TEM characterization of periodical novel amorphousano-crystalline micro-composites obtained by laser interference structuring: The system HAlO-Al·Al_2O_3

机译：通过激光干涉结构获得的周期性新型非晶/纳米微复合材料的SEM / TEM表征：HAlO-Al·Al_2O_3体系

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摘要

Layers of the metastable, amorphous HAlO are synthesized by chemical vapor deposition from the molecular compound tert-butoxyalane ([~tBu-O-AlH_2]_2). At temperatures above 500℃, these layers transform to biphasic Al·Al_2O_3 due to the elimination of di-hydrogen. The interaction of HAlO films with short laser pulses causes partial transformation of amorphous HAlO into nano-crystalline A1-Al_2O_3. Using an interference pattern of two coherent high-power Nd:YAG laser beams produces local and periodic heating, inducing crystallization at equally distant lines in the HAlO layer. Depending on the laser fluence, different morphologies and different amounts of crystalline phases are obtained. In this study, the surface morphology and the distribution of crystalline phases of the structured samples are analyzed using SEM, FIB and TEM. The two-dimensional structures consist of periodic variations of morphology, chemical composition, and phase identity with a well-defined long-range order. When bio-functionalized, the structured samples may be used as carriers for structurally controlled cell-cultivation.
机译：通过化学气相沉积由分子化合物叔丁氧基铝烷（[〜tBu-O-AlH_2] _2）合成亚稳态无定形HAlO的层。在高于500℃的温度下，这些层由于消除了氢原子而转变为双相Al·Al_2O_3。 HAlO薄膜与短激光脉冲的相互作用导致非晶态HAlO部分转变为纳米晶Al-Al_2O_3。使用两个相干的高功率Nd：YAG激光束的干涉图样会产生局部和周期性加热，从而在HAlO层的等距线上引发结晶。根据激光能量密度，可以获得不同的形态和不同数量的晶相。在这项研究中，使用SEM，FIB和TEM分析了结构化样品的表面形态和晶相分布。二维结构由形态，化学成分和具有明确定义的远距离顺序的相身份的周期性变化组成。当进行生物功能化时，结构化的样品可用作载体进行结构控制的细胞培养。

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