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<p>Zinc oxide (ZnO) nanorods, synthesized using a hydrothermal method, were etched in a solution containing ZnO nanopowder for varying durations. The morphological and structural features of the etched ZnO nanorods were characterized using field-emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). FESEM images showed a reduction in both the diameter and length of the nanorods with increasing etching time. Additionally, XRD results revealed a significant decrease in the intensity of the (002) peak as etching time increased. Furthermore, the electrical resistance of the sensors exhibited a substantial increase with prolonged etching time. The sensing properties were enhanced by the etching process; notably, the ZnO nanorods etched for 3&#xa0;h showed excellent UV photoresponsivity and sensitivity, with values of 6.52&#xa0;A/W and 2.4 × 10<sup>5</sup>, respectively. This represents a significant improvement over the unetched nanorods, which exhibited values of 0.67&#xa0;A/W and 420.</p>

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Optimizing ZnO nanorod sensors: the influence etching time on morphology and UV sensitivity

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Z. Shojaei ghahrizjani,
  • A. Khayatian,
  • M. Almasi Kashi

摘要

Zinc oxide (ZnO) nanorods, synthesized using a hydrothermal method, were etched in a solution containing ZnO nanopowder for varying durations. The morphological and structural features of the etched ZnO nanorods were characterized using field-emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). FESEM images showed a reduction in both the diameter and length of the nanorods with increasing etching time. Additionally, XRD results revealed a significant decrease in the intensity of the (002) peak as etching time increased. Furthermore, the electrical resistance of the sensors exhibited a substantial increase with prolonged etching time. The sensing properties were enhanced by the etching process; notably, the ZnO nanorods etched for 3 h showed excellent UV photoresponsivity and sensitivity, with values of 6.52 A/W and 2.4 × 105, respectively. This represents a significant improvement over the unetched nanorods, which exhibited values of 0.67 A/W and 420.