In this work, three samples were synthesized; SnO₂ nanoparticles, ZnO nanorods and ZnO/SnO₂ core–shell nanorods. The preparation of the ZnO/SnO₂ composite included two steps, the first was to spin ZnO thin film as a seed layer. The second step is to grow ZnO/SnO₂ to produce core–shell nanorod devices. The structure and morphology of the prepared samples were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). Meanwhile, the optical properties were investigated by ultraviolet–visible (UV–Vis) and photoluminescence (PL) spectroscopy. The morphology of the prepared sample revealed that ZnO nanorods were capped by SnO₂ shell. The energy band gap of ZnO/SnO₂ is lower than that of both bare ZnO and SnO₂. Evaluations to near-band (PL) emission of bare ZnO nanorod arrays were considerably reduced by capping with SnO₂ sell. The performance of the gas sensor was further examined on the basis of ZnO/SnO₂. The response and sensitivity were measured to be 86.6 ( ± 0.5) at optimum operating temperature of 225 °C toward 100 ppm ethanol vapor, which is even higher than those of the bare ZnO nanorods. The local sites added by the SnO₂ shell layer could probably stop the excitons from becoming captured by intrinsic defects, leading to improved sensitivity of the gas sensor.

在这项工作中，合成了三个样品。SnO ₂纳米颗粒，ZnO纳米棒和ZnO / SnO ₂核-壳纳米棒。ZnO / SnO ₂复合材料的制备包括两个步骤，第一步是旋转ZnO薄膜作为籽晶层。第二步是生长ZnO / SnO ₂以生产核-壳纳米棒器件。用X射线衍射（XRD）和场发射扫描电子显微镜（FE-SEM）对所制备样品的结构和形貌进行表征。同时，通过紫外-可见（UV-Vis）和光致发光（PL）光谱研究了光学性质。所制备样品的形态表明，ZnO纳米棒被SnO ₂壳覆盖。ZnO / SnO的能带隙₂低于裸ZnO和SnO ₂。通过限制SnO _2的销售，大大减少了对裸露的ZnO纳米棒阵列的近带（PL）发射的评估。在ZnO / SnO ₂的基础上进一步研究了气体传感器的性能。在225°C的最佳工作温度下，对100 ppm乙醇蒸气的响应和灵敏度测得为86.6（±0.5），甚至高于裸露的ZnO纳米棒。SnO ₂壳层添加的局部位点可能会阻止激子被固有缺陷捕获，从而提高了气体传感器的灵敏度。