Complex and Composite Metal Oxides for Gas, VOC and Humidity Sensors, Volume Two: Technology and New Trends focuses on an overview of the advanced nanocomposite metal oxide materials used in sensors for environmental monitoring applications. Volume Two discusses the state-of-the-art for the synthesis methods of innovative morphology, metal oxide hybrids, and heterostructures. It also describes the new generation of complex materials such as perovskites, spinel ferrites, and quaternary type-based gas and VOC sensors. This volume includes a brief discussion on advanced strategies for the development of futuristic sensors with properties like room temperature operation, self-power generation, self-healable, or flexible and wearable.