Abstract The 1D ZnO nanorods (NR's) were grown with Zinc (Zn) ion precursor concentration variation on seed layer glass substrate by the low temperature hydrothermal method and utilized for nitrogen dioxide (NO 2 ) gas sensing application. Zn ion precursor concentration varied as 0.02, 0.03, 0.04, 0.05 and 0.06 M and thin films were characterized for structural, morphological, optical, electrical, surface defect study and gas sensing properties. All the film showed dominant orientation along the (002) direction, the intensity of the peak vary with the length of the nanorods. SEM cross images confirmed that nanorods had vertical alignment perpendicular to the plane of the substrate surface. The PL intensity of oxygen vacancy related defects for prepared samples was found to be linearly proportional to gas sensing phenomena. This result in good agreement with the theoretical postulation that, oxygen vacancies plays the important role for adsorption sites to NO 2 molecule. The gas sensing performance was studied as a function of operating temperature, Zn ion precursor concentration variation, and gas concentration. The maximum gas response is 113.32–100 ppm NO 2 gas at 150 °C for 0.05 M sample out of all prepared samples. Additionally, ZnO thin film sensor has potential to detect NO 2 as low as 5 ppm.

中文翻译：

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一维氧化锌纳米棒的制备、表征及其气敏特性

摘要 1D ZnO 纳米棒(NR's) 通过低温水热法在晶种层玻璃基板上随着锌(Zn) 离子前驱体浓度的变化而生长，并用于二氧化氮(NO 2 ) 气体传感应用。Zn 离子前体浓度变化为 0.02、0.03、0.04、0.05 和 0.06 M，并且薄膜具有结构、形态、光学、电学、表面缺陷研究和气体传感特性的特征。所有薄膜均显示沿（002）方向的主导取向，峰强度随纳米棒的长度而变化。SEM 交叉图像证实纳米棒具有垂直于基板表面平面的垂直排列。发现制备样品的氧空位相关缺陷的 PL 强度与气敏现象成线性比例。该结果与理论假设非常吻合，即氧空位对NO 2 分子的吸附位点起重要作用。气敏性能被研究为操作温度、锌离子前体浓度变化和气体浓度的函数。对于所有制备的样品中的 0.05 M 样品，在 150 °C 时的最大气体响应为 113.32–100 ppm NO 2 气体。此外，ZnO 薄膜传感器具有检测低至 5 ppm 的 NO 2 的潜力。05 M 样品出所有准备的样品。此外，ZnO 薄膜传感器具有检测低至 5 ppm 的 NO 2 的潜力。05 M 样品出所有准备的样品。此外，ZnO 薄膜传感器具有检测低至 5 ppm 的 NO 2 的潜力。