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Facile Soft Solution Route To Engineer Hierarchical Morphologies of ZnO Nanostructures

机译：ZnO纳米结构的工程分层形态的简便的软解决方案途径

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摘要

Novel hierarchical nanostructures have huge potential in different applications. Herein, we report a facile way of engineering different morphologies of zinc oxide (ZnO) thin films by using successive ionic layer adsorption and reaction (SILAR) method. By changing the degree of supersaturation, significant variation in the crystal orientation and the morphology were obtained for ZnO thin films. X-ray diffraction (XRD) study revealed wurtzite crystal structure of zinc oxide nanostructures, which was further supported by Raman spectra. Surface morphology unveils nanostructures such as nanoflakes, nanoflowers, and branched nanorods. To our best knowledge, this is the first report on branched nanorod nanostructures by SILAR method. Nucleation and crystal growth are driven by the amount of Zn(OH)(4)(2-) species in the solution through which new structures can be obtained. Photoluminescence spectra revealed ultraviolet and visible emission (green and yellow) from all of the morphologies. Wettability test shows hydrophobic surfaces of all of the morphologies. This one-step, wet-chemical mild approach is controllable and reproducible for obtaining different morphologies which can be conveniently transferred to applications such as photocatalysis and gas sensing.
机译：新型的分层纳米结构在不同的应用中具有巨大的潜力。本文中，我们报告了一种通过使用连续离子层吸附和反应（SILAR）方法工程化不同形态的氧化锌（ZnO）薄膜的简便方法。通过改变过饱和度，可以得到ZnO薄膜的晶体取向和形态的显着变化。 X射线衍射（XRD）研究揭示了锌氧化物纳米结构的纤锌矿晶体结构，这进一步得到了拉曼光谱的支持。表面形态揭示了纳米结构，例如纳米薄片，纳米花和分支的纳米棒。据我们所知，这是通过SILAR方法首次报道的分支纳米棒纳米结构。溶液中Zn（OH）（4）（2-）种类的数量可驱动成核和晶体生长，通过该溶液可以获得新的结构。光致发光光谱揭示了所有形态的紫外线和可见光发射（绿色和黄色）。润湿性测试显示了所有形态的疏水表面。这一一步的湿化学温和方法可控且可重现，以获得不同的形态，可以方便地转移到诸如光催化和气体传感之类的应用中。

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