Molybdenum Disulphide and Titanium Dioxide Nanocomposite Based fast Humidity Sensor with Linear Response over wide Humidity Range

A humidity sensor based on MoS₂/TiO₂ nanocomposite prepared by solid state reaction method is presented in this work. X-ray diffraction (XRD) confirms the formation of nanocomposite consisting of irregular shaped nanoparticles of different sizes (60 –200 nm). Energy Dispersive Spectroscopy (EDS) confirms the presence of Titanium, Molybdenum, Sulphur, and Oxygen in the nanocomposite. Humidity sensing characteristic of MoS₂/TiO₂ nanocomposite are studied at room temperature from 11 to 97% relative humidity (RH) using AC impedance spectroscopy. The response and sensitivity of MoS₂/TiO₂ nanocomposite sensor are calculated from AC impedance data. The values of response and sensitivity turn out to be 86% and ∼ 13 kΩ/ \(\%RH\) , respectively at 100 Hz. The nanocomposite sensor shows response and recovery time of ∼ 38s and ∼ 7s respectively with good repeatability. The sensor response remains stable for 30 days. Moreover, RH effect on AC conductivity and complex electric modulus of MoS₂/TiO₂ nanocomposite are also investigated.