Chapter One is focused on the basic concept of magnetron sputtering, magnetic configurations and applied power for various applications. The deposition of thin films of metals, metal oxides, metal nitrides and transition metal dichalcogenide materials by magnetron sputtering techniques for various applications is also examined. In Chapter Two, the limitations for the conventional magnetron sputtering plasma are introduced. Chapter Three begins with an overview of conjugated polymers for optoelectronic applications and the purpose of polymer blending. The chapter also addresses various blending strategies like the molecular weight of the non-conjugated polymer, blending approach, degree of crystallization, aggregation and solvation. In Chapter Four, the effect of carbon nanotubes (CNTs) on the crystallization of PLA nanocomposites is investigated. Chapter Five provides a detailed discussion of the main findings of various studies carried out for different combinations of polymer blend films consisting of insulating polymers, and blend films consisting of insulating and conducting polymers. Chapter Six focuses on degradable, biocompatible polymer blend films for microwave absorption. The last chapter of this book reviews the structure, advantages and disadvantages for a general understanding of carbon nanotubes (CNT) and then focuses on the applications of CNTs in a variety of electronic devices such as lithium-ion batteries, fuel cells, supercapacitors and solar cells.