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Seed layer-free synthesis and characterization of vertically grown ZnO nanorod array via the stepwise solution route

机译：无种子层的合成及通过逐步溶液法表征的垂直生长的ZnO纳米棒阵列

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摘要

A novel stepwise method was developed for the deposition of ZnO nanorod array (NRA) from the simple inorganic aqueous solution. Different from the traditional one-pot synthesis route, merely a thin liquid precursor layer adsorbed on the substrate instead of the bulk solution underwent the reaction at elevated temperature in a typical deposition cycle. Sparse and vertically grown wurtzite ZnO NRA was deposited on seed layer-free glass substrate after 20 cycles (in typically 20 min). Each individual ZnO rod possessed the well-defined hexagonal facet, the side length of about 150 nm, the aspect ratio of 2:3, and the small size dispersity. Also the overall ZnO NRA exhibited high ultraviolet photoluminescence and weak blue emission, indicating its good optical properties. Mechanism analysis indicated that, the decrease of the supersaturation degree in solution after the climax in the reaction period of each deposition cycle is the root cause of the sparse nucleation and the vertical growth of ZnO nanorods. The work has opened up a novel stepwise approach toward high quality ZnO NRA, being valuable for extending the synthetic methods of semiconductor nanostructures in mild solutions.
机译：开发了一种新颖的逐步方法，用于从简单的无机水溶液中沉积ZnO纳米棒阵列（NRA）。与传统的一锅法合成路线不同，在典型的沉积循环中，仅在基材上吸附的薄液体前体层（而不是本体溶液）在升高的温度下进行反应。 20个周期（通常20分钟）后，将稀疏且垂直生长的纤锌矿型ZnO NRA沉积在无种子层的玻璃基板上。每个单独的ZnO棒都具有定义明确的六边形小面，约150 nm的边长，2：3的长宽比和较小的尺寸分散性。同样，整个ZnO NRA表现出高紫外光致发光和弱蓝光发射，表明其良好的光学性能。机理分析表明，在每个沉积循环反应期达到高潮后，溶液的过饱和度降低是ZnO纳米棒稀疏成核和垂直生长的根本原因。这项工作为高质量的ZnO NRA开辟了一种新颖的逐步方法，对于在温和的溶液中扩展半导体纳米结构的合成方法非常有价值。

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