**Preface**

Polymerized nanoparticles and nanofibers can be prepared using various processes, such as chemical synthesis, the electrochemical method, electrospinning, ultrasonic irradiation, hard and soft templates, seeding polymerization, interfacial polymerization, and plasma polymerization. Among these processes, plasma polymerization and aerosol-through-plasma (A-t-P) processes have versatile advantages, especially due to having a "dry" process, for the deposition of plasma polymer films and carbon-based materials with functional properties suitable for a wide range of applications, such as electronic and optical devices, protective coatings, and biomedical materials. Furthermore, it is well known that plasma polymers are highly cross-linked, pinhole-free, branched, insoluble, and adhere well to most substrates. In order to synthesize polymer films using plasma processes, therefore, it is very important to increase the density and electron temperature of plasma during plasma polymerization.

This Special Issue aimed to compile original and cutting-edge research works in the fields of plasma process, polymerization, synthesis, characterization, treatment, modification, manufacturing, and applications of functional plasma-processed polymers.

> **Choon-Sang Park** *Editor*
