Recent developments in the field of chemical sensors have been described in this comprehensive book. The function of chemical sensors is very important in multiple spheres like conservation of environment, prevention of disease, industrial evaluation and disaster management. A typical chemical sensor is a tool that alters chemical data in a careful and reversible manner, varying from the concentration of a particular trial component to entire composition study, into an analytically helpful indicator. Important studies have been carried out to develop a chemical sensor that responds quickly, is cost effective and compact, and holds fine investigating capability. This book presents current advancements in this field. It contains data accumulated by experts. This collection of current data and state-of-the-art progress provides critical contexts and study resources for everyone involved in study and practice related to chemical sensors.