"Sensing of different chemicals is important in the context of detection of specific chemicals in certain environment. Different materials may be used for sensing specific chemicals, whereas different chemicals may also be sensed by a specific material via different detection mechanisms. This book primarily focuses on the application of different materials in chemical sensors. The mechanisms as well as performances of different materials for identification of different chemicals have been discussed here. Moreover, this book will also be a valuable reference tool to select suitable materials for possible use in chemical sensors"--