Abstract

In this work, atypical zinc oxide nanorods (ZnO NRs) on quartz substrates were successfully synthesized using simple, low-cost, and environmentally friendly hydrothermal method. The ZnO NRs were grown on a pre-seeded seed layer of ZnO nanocrystals using the spin coating process. Gold nanoparticles (Au NPs) were sputtered on the ZnO NRs film. The structure and morphology of the produced nanostructures were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The XRD analysis revealed that the ZnO NRs were single crystalline with hexagonal wurtzite structure grown with preferred orientation of (002). The SEM morphology shows a semi-hierarchical ZnO NRs with an estimated diameter of 200–400 nm and length of 4–5 μm. The optical properties of the ZnO NRs film were investigated using UV-visible spectrophotometers. The obtained bandgap of ZnO film was 3.0 eV. Electrical and thermal properties were also measured. The resistance changes versus temperature variation of ZnO NRs were given a semiconductor behavior. The gas sensor was fabricated based on bare ZnO NRs and Au NPs/ZnO NRs hybrid. The second nanostructure exhibited an enhanced sensor sensitivity toward ethanol gas at an optimized working temperature of 325 °C.

中文翻译：

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用于气体传感器制造的镀金支链ZnO纳米棒的合成

摘要

在这项工作中，使用简单，低成本和环保的水热方法成功地合成了石英衬底上的非典型氧化锌纳米棒（ZnO NRs）。使用旋涂工艺将ZnO NRs生长在ZnO纳米晶体的预种子晶种层上。将金纳米颗粒（Au NPs）溅射在ZnO NRs薄膜上。通过X射线衍射（XRD）和扫描电子显微镜（SEM）表征所产生的纳米结构的结构和形态。XRD分析表明，ZnO NRs为单晶，具有六方纤锌矿结构，优选取向为（002）。SEM形态显示出一个半分层的ZnO NR，估计直径为200-400 nm，长度为4-5μm。使用紫外可见分光光度计研究了ZnO NRs薄膜的光学性能。所获得的ZnO膜的带隙为3.0eV。还测量了电性能和热性能。给出了ZnO NRs的电阻变化与温度变化的关系。气体传感器是基于裸露的ZnO NR和Au NPs / ZnO NRs混合材料制成的。在325°C的最佳工作温度下，第二个纳米结构对乙醇气体表现出增强的传感器敏感性。