Different nanostructures of tungsten oxide (WO ₃ ) can be hydrothermally synthesized by controlling the pH value through adding HCl solution. WO ₃ has a square plate-like structure when the mixture solution has a pH value of 1.0. At this pH, WO ₃ nanoplates are dispersed and did not formed clusters. Porous nickel oxide (NiO) spheres are also hydrothermally synthesized for decoration on the surface of WO ₃ nanoplates. Holes on the NiO spheres increase the surface area of the material and enhance the sensing performances of the sensor. By combining these two materials, the sensor with p-n-n junction is sensitive to ethanol and has a high sensitivity of 155%. The response and recovery times are also fast with good sensitivity and selectivity. It has a high potential for applying to ethanol sensing in industrial and medical areas.

中文翻译：

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氧化镍和氧化钨纳米复合材料的乙醇气体传感器


通过添加HCl溶液控制pH值，可以水热合成不同纳米结构的氧化钨(WO ₃ )。当混合溶液的pH值为1.0时，WO ₃具有方板状结构。在此pH下，WO ₃纳米板分散并且不形成簇。还水热合成了多孔氧化镍（NiO）球，用于WO ₃纳米板表面的装饰。 NiO 球上的孔增加了材料的表面积并增强了传感器的传感性能。通过将这两种材料结合起来，具有pnn结的传感器对乙醇敏感，并且具有155%的高灵敏度。响应和恢复时间也很快，具有良好的灵敏度和选择性。它在工业和医疗领域的乙醇传感中具有很大的应用潜力。