Over the past fifty years, gas sensors based on metal semiconducting oxides (MOXs) have drawn attention due to their performance in detecting various gases. Thus, we report herein on a BTEX gases sensor based on hematite (α-Fe₂O₃) microrhombuses synthesized via the hydrothermal method. X-ray diffraction and X-ray absorption spectroscopy analyses indicated the presence of a pristine hematite phase after hydrothermal treatment. Electron microscopy analyses revealed that the hematite sample consists of single-crystals with a rhombus-like shape and an average size of 140 nm. Electrical measurements pointed out that hematite microrhombuses were sensitive towards sub-ppm BTEX levels, in which the minimum detected level was 3 ppb and the long-term stability was 1 month. The results presented here demonstrate the potential of hematite microrhombuses as a sensing material to manufacture BTEX gas sensor devices.

在过去的五十年中，基于金属半导体氧化物（MOX）的气体传感器因其检测各种气体的性能而受到关注。因此，我们在BTEX气体在此报告传感器基于赤铁矿（α-的Fe ₂ ö ₃）通过水热法合成的微菱形。X射线衍射和X射线吸收光谱分析表明，水热处理后存在原始的赤铁矿相。电子显微镜分析显示，赤铁矿样品由具有菱形形状且平均尺寸为140 nm的单晶组成。电学测量表明，赤铁矿微菱形对亚ppm BTEX水平敏感，其中最低检出水平为3 ppb，长期稳定性为1个月。此处显示的结果证明了赤铁矿微菱形作为制造BTEX气体传感器设备的传感材料的潜力。