This book focuses on the development of room-temperature operated gas sensors made of PPy composites for the detection of hazardous gases like ammonia, with potential applications in biomedicine and industry. A significant advancement in gas sensor technology is In-situ chemical oxidative polymerization of pyrrole using novel dopant and oxidant. The investigation also covers the fabrication of metal oxide and noble element nanoparticles, screen-printing thin films on interdigitated electrodes, and in-situ chemical polymerization as a means of forming nanocomposite formation. At room...