α-Fe₂O₃ nanorods have been grown by hydrothermal method, dispersed in ethanol and drop casted on a pre-patterned alumina substrate with Pt electrodes. Their morphology, crystalline and electronic properties have been investigated by Scanning Electron Microscopy, Raman and X-ray Photoelectron Spectroscopies and X-ray Diffraction. The so-fabricated devices have been used for hydrogen gas sensing, showing their ability to detect H₂ at operating temperatures > 200 °C, at relative humidity values comprised from 0% to 50%. The sensing behavior of α-Fe₂O₃ nanorods is compatible with an n to p conductivity transition when the operating temperature is increased up to 300 °C. Outstanding p-type hydrogen sensing performances of α-Fe₂O₃ have been observed and reported. Besides H₂ detection, the α-Fe₂O₃ nanorods-based device is a good humidity sensor, at room temperature (n-type) and at 400 °C (p-type). CO and ethanol sensing performances have been investigated at different operating temperatures and relative humidity values. CO and ethanol anomalous acceptor-like behaviors at 200 °C in humid air has been explained by the interactions of these target gases with the water molecules adsorbed on the metal oxide surfaces.

An explanation of the n–p behavior transition at T > 200 °C in terms of band bending is reported.

的α-Fe ₂ ö ₃纳米棒已通过水热法生长，分散在乙醇中并用铂电极的预图案化的氧化铝基板上滴落流延。通过扫描电子显微镜，拉曼和X射线光电子能谱和X射线衍射研究了它们的形态，晶体和电子性质。如此制造的装置已经用于氢气感测，显示出它们在大于200％的工作温度，相对湿度值为0％至50％的情况下检测H ₂的能力。的感测的行为的α-Fe ₂ ö ₃当工作温度升高到300°C时，纳米棒与n到p的电导率过渡兼容。的α-Fe的优秀p型氢传感器性能₂ ö ₃已经观察和报告。除H外₂检测时，的α-Fe ₂ ö _3个纳米棒为基础的装置是一个很好的湿度传感器，在室温（n型），在400℃（p型）。已经在不同的工作温度和相对湿度值下研究了CO和乙醇的传感性能。这些目标气体与吸附在金属氧化物表面的水分子之间的相互作用已解释了在潮湿空气中200°C下的CO和乙醇异常受体样行为。

据报道，在T> 200°C时，n-p行为转变是基于带弯曲的。