_Paper-based Optical Chemosensors_ comprehensively discusses the origin, development, and current state-of-the-art in paper-based sensors. With a focus on the principles, classifications, methodology, design, and application of paper-based sensors, this book represents a developing research field with recent innovative applications resulting in a comprehensive presentation of the different physico-chemical techniques using paper sensors. It discloses underlying rules and factors in paper-based sensors and discusses intricate sensing systems and working environments by ways of chemistry and physics for a variety of application scenarios such as environmental protection, food safety, public safety, and clinical diagnosis. This is a valuable resource for researchers who major in analytical chemistry, or for those who are interested in the development of methods or devices for rapid analysis/monitoring based on paper/membrane-based sensors who wish to broaden their knowledge in the allied field. * Presents a comprehensive discussion on the current state, challenges, and future perspectives of paper-based optical chemosensors * Offers discussions on the classification, methodology, design, and application of paper based sensors * Provides opportunities for readers to design paper based sensors with specific purpose and deeper awareness