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Mass production of ZnO nanotetrapods by a flowing gas phase reaction method

机译：气相气相反应法大规模生产ZnO纳米四足动物

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摘要

We have developed a flowing gas phase reaction method for synthesizing ZnO nanotetrapods. The synthesis was carried out in a tube furnace under air pressure using air and nitrogen as reactive and carrying gases. The zinc precursor was provided by carbothermal reduction of ZnO powder. The source material transformation efficiency is higher than 90%. ZnO nanotetrapods were nucleated and grown in the gas phase via a vapor-solid mechanism. The reaction occurred at a temperature controlled to 1050-1200 degrees C and gas flow rate controlled to 0.7-2 L/min. The high flow rate suppressed the diffusion of growth precursors and productions towards the tube wall, and localized them into a gas phase pipe. The harvested ZnO nanotetrapods were carried by the flowing gas and collected outside of the furnace. The sizes of the nanotetrapods range from several hundred nanometers to more than 10 mu m with leg diameters of 30-200 nm. The flowing gas phase reaction method provides a relatively uniformity environment for nanotetrapod growth and simplifies the product collection procedure compared with other techniques. This technique is simple and inexpensive, which is promising for realizing continuous mass production of ZnO nanotetrapods on a factory scale.
机译：我们已经开发了一种用于合成ZnO纳米四足动物的气相反应方法。所述合成在管式炉中在空气压力下使用空气和氮气作为反应性和载气进行。通过碳热还原ZnO粉末提供锌前体。源材料转换效率高于90％。 ZnO纳米四足动物通过气相-固相机理成核并在气相中生长。反应在控制在1050-1200℃的温度和控制在0.7-2L / min的气体流速下发生。高流速抑制了生长前体和产物向管壁的扩散，并将它们定位在气相管中。所收获的ZnO纳米四脚架由流动的气体携带并收集到炉外。纳米四足动物的大小范围从几百纳米到超过10微米，腿长为30-200纳米。与其他技术相比，气相气相反应方法为纳米四足动物的生长提供了相对均匀的环境，并简化了产物收集过程。该技术简单且便宜，这有望实现工厂规模的ZnO纳米四脚架的连续批量生产。

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