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Ultraviolet-emitting ZnO nanostructures on steel alloy substrates: Growth and properties

机译：钢合金基底上的紫外线发射ZnO纳米结构：生长和性能

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摘要

ZnO nanostructures with a variety of morphologies and sizes, such as urchinlike structures composed of small-head nanonails, vertically aligned nanonails and nanocones, comblike nanostructures, hierarchical nanostructures, etc., have been synthesized via the simple thermal evaporation process onto the steel alloy substrate without the use of any metal catalyst or additives. It was observed from the detailed morphological and structural studies that substrate temperature, distances between source material and substrates, concentration of zinc vapors, zinc partial pressure, concentrations of reactant gases, and choices of substrates have serious impact on the morphologies and structural properties of as-grown products. Therefore, within certain reaction parameters, specific morphologies can be obtained. Detailed structural observations confirmed that the as-grown products are single-crystalline with the wurtzite hexagonal phase and grown along the (0001) directions. Raman-scattering and room-temperature photoluminescence (PL) studies revealed that the as-grown products have good crystallinity with excellent optical properties. The low-temperature PL (LTPL) studies, measured in the temperature range from 11-300 K, of the vertically aligned ZnO nanonails grown at position "B" revealed the presence of excitonic emissions and their multiple-phonon replicas in the ultraviolet region. Additionally, it has also been found that the temperature dependence of free exciton peak position can be successfully described by the standard Varshini's expression.
机译：ZnO纳米结构具有多种形态和大小，例如通过小头纳米指甲，垂直排列的纳米指甲和纳米锥组成的顽童状结构，梳状纳米结构，分层纳米结构等，已通过简单的热蒸发工艺合成到了钢合金基底上无需使用任何金属催化剂或添加剂。从详细的形态学和结构研究发现，衬底温度，源材料与衬底之间的距离，锌蒸气的浓度，锌分压，反应气体的浓度以及衬底的选择对铝的形态和结构特性有严重影响。种植产品。因此，在某些反应参数内，可以获得特定的形态。详细的结构观察证实，所生长的产物是具有纤锌矿六方相的单晶，并且沿（0001）方向生长。拉曼散射和室温光致发光（PL）研究表明，所生长的产品具有良好的结晶度和出色的光学性能。在11-300 K的温度范围内测得的在位置“ B”处生长的垂直排列的ZnO纳米钉的低温PL（LTPL）研究表明，在紫外线区域中存在激子发射及其多声子复制体。另外，还已经发现，自由激子峰位置的温度依赖性可以通过标准的Varshini表达式成功地描述。

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