Humidity sensing potential of Fe2TiO5—pseudobrookite

Humidity sensing properties of nanocrystalline pseudobrookite (Fe2TiO5) based thick films

“…The time delay was slightly higher at room temperature, compared to the time delay at 50 o C with the larger time delay occurring at lower humidity and higher measured impedance. It was similar to the time delay we obtained for bulk pseudobrookite samples [11] and other thick film humidity sensors [5,37].…”

“…Zhu et al [33] analyzed the sensor response of Fe2TiO5 tube like nanostructures to ethanol as S = Ra/Rg. In our previous work [11] we determined the sensor response of Fe2TiO5 bulk samples as:…”

“…Interaction of Fe2TiO5, a metal-oxide n-type semiconductor, with water molecules (humidity) can be described by two basic processes: chemisorption and physisorption [1,2,5,11]. A schematic illustrating of the humidity sensing mechanism of pseudobrookite thick films is shown in Fig.…”

“…15. The CPE element was used to replace the capacitor, as described in detail in [11,40]. The applied equivalent circuit reflected the combined influence of different conduction mechanisms.…”

“…In the continued search for a good photoelectrode material combination, in recent literature, Fe2TiO5 figures often [8][9][10]. In our previous work we investigated the humidity sensing potential of pseudobrookite in bulk form [11]. In this work we have focused on analyzing humidity sensing of nanostructured pseudobrookite based thick films by monitoring the change in impedance in conditions of enhanced humidity (relative humidity 30-90%).…”