Complex and Composite Metal Oxides for Gas, VOC, and Humidity Sensors, Volume 2: Technology and New Trends provides an overview of the advanced nanocomposite metal oxide materials used in sensors for environmental monitoring applications. Volume 2 discusses the state of the art in 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 of advanced strategies for the development of futuristic sensors with properties such as room temperature operation, self-power generation, self-healability, flexibility, and wearability.