ABSTRACT
The potential of flexible and wearable sensors based on metal oxides has been of great interest in recent years due to their low cost and ease of manufacturing. The bandgap of the metal oxides can easily be tuned through shape modifications such as nanotubes or nanosheets or hybridization with another material such as inorganic or organic compounds, among others Furthermore, these structural modifications can also lead to large specific areas to fit into the desired application. In this chapter, we discuss the common applications of flexible sensors in environmental and health monitoring such as gas sensors, pH sensors, humidity sensors, biomaterial sensors, and temperature sensors. We also briefly discuss the basic operational principle of the individual sensors. Lastly, an analysis of the challenges of developing metal oxides in flexible and wearable sensors and their future perspectives are presented.
