In this paper, ZnO nanorods were synthesized by low cost and simple wet chemical method and used as a highly sensitive acetone gas sensor with detection limit as low as 25 ppb which makes the sensor a promising choice for various applications. The fabricated sensor showed a response value of 1.75 towards 25 ppb acetone at optimum working temperature of 320 °C with a response time of 30s. However, the sensor showed response value of 60 towards 50 ppm acetone with a response time of 15 s. The grown ZnO nanorods were examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD) for morphology and crystallinity characterization. According to the SEM images, freestanding nanorods with mean diameter of 80 nm and mean length greater than 1.5um were obtained with highly preferential c-axis orientation.

本文以低成本，简单的湿化学方法合成了ZnO纳米棒，并将其用作检测限低至25 ppb的高灵敏度丙酮气体传感器，这使得该传感器成为各种应用的有前途的选择。装配好的传感器在最佳工作温度为320°C时对25 ppb丙酮的响应值为1.75，响应时间为30s。但是，传感器显示出对60 ppm丙酮的响应值为60，响应时间为15 s。通过扫描电子显微镜（SEM）和X射线衍射（XRD）检查生长的ZnO纳米棒的形貌和结晶度。根据SEM图像，获得了具有高度优先c轴取向的平均直径为80 nm，平均长度大于1.5um的独立式纳米棒。