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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Fabrication of ZnO nanorods and assessment of changes in optical and gas sensing properties by increasing their lengths
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Fabrication of ZnO nanorods and assessment of changes in optical and gas sensing properties by increasing their lengths

机译：ZnO纳米棒的制造以及通过增加其长度来评估光学和气体传感特性的变化

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We report a low-temperature process to synthesize highly oriented arrays of ZnO nanorods, based on the epitaxial growth of the ZnO seed layer at a low temperature of 70 ℃. The ZnO seed layer was deposited by sol-gel process under mild conditions on the glass substrates. The morphologies and crystal structures of the film and nanorods were characterized by x-ray diffraction and scanning electron microscopy, respectively. ZnO nanorods were grown on ZnO seed layers by hydrothermal method. The effect of growth period on the morphology and optical characteristics (e.g. optical transmission and band-gap energy), hydrophilicity and gas sensing properties of the grown ZnO seed layer (film) and nanorods were investigated. The long nanorods on the seed layer were observed. The increase in the length of the nanorods resulted in a significant reduction in the optical band-gap energy of the nanorods, which was attributed to the formation of further defects in the nanorods during their fast growth. The surface of the ZnO nanorods grown for 6 h was relatively hydrophilic (with a water contact angle of 18°). The fabricated sensors were used to gauge different concentrations of ethanol vapor in the air at different temperatures and evaluated the surface resistance of the sensors as a function of operating temperature and ethanol concentrations. The results showed that the sensitivity of the nanorods changed from 1.3 to 6 (at 300 ℃) by increasing the growth period.
机译：我们报告了一个低温过程，以在70℃的低温下外延生长ZnO籽晶层来合成高度定向的ZnO纳米棒阵列。 ZnO种子层是通过溶胶-凝胶工艺在温和条件下沉积在玻璃基板上的。薄膜和纳米棒的形貌和晶体结构分别通过X射线衍射和扫描电子显微镜表征。 ZnO纳米棒通过水热法生长在ZnO种子层上。研究了生长时间对生长的ZnO种子层（薄膜）和纳米棒的形态和光学特性（例如光透射和带隙能量），亲水性和气体传感性能的影响。观察到种子层上的长纳米棒。纳米棒长度的增加导致纳米棒的光学带隙能量显着降低，这归因于纳米棒在其快速生长期间形成了进一步的缺陷。生长6小时的ZnO纳米棒的表面相对亲水（水接触角为18°）。所制造的传感器用于在不同温度下测量空气中乙醇蒸气的不同浓度，并根据操作温度和乙醇浓度评估传感器的表面电阻。结果表明，随着生长时间的延长，纳米棒的敏感性从300℃的1.3改变为6。

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