This book, Functional Nanocomposites and Their Applications, explains innovative developments in nanocomposites. It covers novel findings and various applications of nanocomposites in different emerging fields. Chapters cover several types of nanocomposites as well as their synthesis, manufacturing, characteristics, and applications. Special emphasis is given to innovative works on functional nanocomposites and their relevant areas of use. The authors depict the stability and functionality of nanocomposites and their applications in various sectors, such as industrial, structural, biomedical, etc. Nanocomposites in wastewater treatment, Mn O2 and graphene nanostructures, computer modeling of structure and mechanical behavior, polythiophene nanocomposites, and other topics are covered in the chapters.Nanocomposites have a high surface-to-volume ratio and hence have strong mechanical characteristics, making them suitable for application in the automotive and construction sectors. Nanocomposites show better property enhancement over conventional composites i.e., properties such as electrical, thermal, mechanical, and barrier. They have good transparency and also reduce the property of flammability. Other uses include power tool housing, electronic covers, and so forth.This book will help readers easily understand the effective implementation of different types of nanocomposites, such as for environmental remediation, biomedical applications, lightweight designed goods with better mechanical, thermal, or chemical resistance qualities, etc. This book will be valuable for scientists and engineers both in academics and industry.