Ultra-fast α-MoO3 nanorod-based Humidity sensor

Abstract

One-dimensional nanostructure metal oxide nanomaterials shows high potential for applications in sensor. The molybdenum oxide is widely used in various applications from electronics to energy storage. We have synthesized molybdenum trioxide (MoO3) nanorods by simple hydrothermal method and characterized by X-ray diffraction, Raman spectroscopy, UV–visible spectroscopy, photoluminescence spectroscopy, scanning electron microscopy, and transmission electron microscopy (TEM). The TEM confirmed the formation of highly crystalline MoO3 nanorods with a length of 5–10 μm. The MoO3 nanorods were used for the humidity sensing in the range of 11–97% relative humidity. The synthesized MoO3 nanorods sensor device was exposed to different humidity levels which show the fast response and recovery time. This indicates that the MoO3 nanorod-based humidity sensor has potential for industrial applications.