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Tailoring the surface of ZnO nanorods into corrugated nanorods via a selective chemical etch method

机译：通过选择性化学刻蚀方法将ZnO纳米棒的表面裁切成波纹状的纳米棒

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摘要

Using the chemical vapour deposition method, we successfully converted smooth ZnO nanorods (NRs) into corrugated NRs by simply increasing the reaction time. The surface morphology and crystallographic structure of the corrugated NRs were investigated. The corrugated NRs were decorated by alternant (11 (2) over bar1) and (11 (2) over bar(1) over bar) planes at the exposed side surfaces while the conventional {10 (1) over bar0} planes disappeared. No twinning boundaries were found in the periodically corrugated structures, indicating that they were type II corrugated NRs. Further investigation told us that they were selectively etched. We introduced a hydrothermal method to synthesize the smooth ZnO NRs and then etched them in a tube furnace at 950 degrees C with a flow of carbon monoxide. By separating the growth stage and the selective etching stage, we explicitly demonstrated a successfully selective etching effect on ZnO NRs with a carbon monoxide reducing atmosphere for the first time. An etching mechanism based on the selective reaction between carbon monoxide and the different exposed surfaces was proposed. Our results will improve the understanding of the growth mechanism on coarse or corrugated NRs and provide a new strategy for the application of surface controlled nanostructured materials.
机译：使用化学气相沉积方法，我们仅通过增加反应时间就成功地将光滑的ZnO纳米棒（NRs）转化为波纹状的NRs。研究了波纹状NR的表面形态和晶体结构。波纹状NR由裸露的侧面上的交替（bar1上方的11（2）和bar（1上方的bar（1））平面装饰，而常规{10（1）上方的bar0}平面则消失了。在周期性波纹结构中未发现孪晶边界，表明它们是II型波纹NR。进一步的调查告诉我们，它们是选择性蚀刻的。我们引入了一种水热法来合成光滑的ZnO NR，然后在一氧化碳流中于950℃的管式炉中对其进行蚀刻。通过分离生长阶段和选择性刻蚀阶段，我们首次明确地证明了在一氧化碳还原气氛下对ZnO NRs的成功选择性刻蚀效果。提出了基于一氧化碳与不同暴露表面之间选择性反应的刻蚀机理。我们的结果将增进对粗糙或波纹状NR的生长机理的了解，并为表面控制纳米结构材料的应用提供新的策略。

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