Introduction: State of the art, new challenges and opportunities of sensory devices, polymer-based nano-bio materials, opto-electrochemical devices as sensor

In this chapter, we present an overall description of various development techniques of sensory devices. The applications of these sensory devices have been emphasized in the book. This book covers the topics such as organic semiconductors for chemical and physical sensing; conducting polymers in sensor applications; guest-induced phosphorescence, chemically functionalized organic semiconductors for highly selective sensing; phosphorescent assay with long-lived carbon quantum dots. This book also describes the composite organic-inorganic sensors; fiber-optic pH sensor, organic thin-film transistor (OTFT) strain gauges for biomedical applications; OTFT infrared sensors for touchless human-machine interaction. Some important topics related to ultrasensitive phosphorescence sensors, mechanofluorochromic materials, smart fabric sensors, and e-textile technologies; organic light-emitting diode biosensing platform, image capture with organic sensors; solid-state pH sensor, organic gas sensors, and electronic noses; electrolyte gated organic transistors for biochemical sensing; ion-selective organic electrochemical transistors; DNA biosensors; metabolic organic sensors; and conductive polymer-based sensors for biomedical applications have also been described in this book. This book will help them to perceive an efficient, reliable, and highly versatile approach for the synthesis of different molecular systems suitable for diversity-oriented strategies, structure-activity studies, and molecular tailoring for the sensing of different guest analytes.