Investigations of Different Ion Intercalations on the Performance of FBG Hydrogen Sensors Based on Pt/MoO₃

α-MoO₃ has been used as a hydrogen sensing material due to its excellent properties and unique crystalline layer structure. However, the low repeatability of α-MoO₃ based hydrogen sensor restricts its practical application. In this paper, the effect of intercalated ion species and the amount in α-MoO₃ is experimentally investigated and discussed. It is concluded that the repeatability of the sensor depends on the radius of intercalated ions and amount of ionic bonds. The optimal ion species is Na⁺ and the optimal amount of precursor is 1 mmol.