Improving the properties of FeO by a sparking method under a uniform magnetic field for a high-performance humidity sensor.

Iron oxide (FeO) thin films are promising semiconductors for electronic applications because FeO is an earth-abundant semiconductor with an appropriate band gap. However, many methods for the synthesis of FeO thin films require a corrosive source, complex procedures, and many types of equipment. Here, we report, for the first time, a simple method for FeO deposition using sparking under a uniform magnetic field.