## 1 Introduction  
Recently, various nanomaterials, such as nanofibers, nanoparticles, nanowires, nanotubes, nanoribbons, _etc._, have attracted a great deal of attention due to their technological advances in broadening the scope of applications, for instance, optoelectronics, molecular electronics, and bionanotechnologies [1; 2; 3]. The creation of new nanomaterials would require novel technological developments. Among various nanomaterials, polymer nanostructures have aroused great deal of interest because of the ease of the methods and their many advantages [4]. Polymerized nanoparticles and nanofibers can be prepared using various techniques, such as chemical synthesis, electrochemical method, electrospinning, ultrasonic irradiation, hard and soft templates, seeding polymerization, interfacial polymerization, and plasma polymerization [5; 6; 7; 8; 9; 10; 11; 12; 13; 14; 15; 16; 17]. Among these methods, plasma polymerization and aerosol-through-plasma (A-T-P) systems have versatile advantages, especially having \"dry\" process, for the deposition of plasma polymer films [3; 18; 19; 20; 21] and carbon based materials [22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33] 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. Plasma polymerization is mostly performed at low pressure and radio frequency (RF) plasmas [34; 35; 36], limiting its application to batch processes. In addition, in low pressure plasma techniques, vacuum pumping systems are costly and require routine maintenance. Moreover, the allowed substrate size is limited by the chamber size. This has motivated the research and development of atmospheric pressure plasma techniques to simplify the experimental operations and to reduce apparatus cost and process time. Recently, atmospheric pressure plasma jets (APPJs) have been studied, mainly for the surface modification and biomedical application due to their low temperatures [37; 38; 39]. However, conventional APPJs have difficulty in realizing plasma polymerization due to the low plasma energy in ambient air conditions; as a result, they would not feed enough energy for activation to the monomers. In spite of intensive studies, only a few groups have reported successful plasma polymerization using APPJs [40; 41; 42; 43; 44]. Nonetheless, most plasma polymer films grown using the APPJs tend to show poor film qualities, such as low molecular weight and weak chemical stabilities, which would inherently result from the use of plasma with low density and electron temperature in monomer fragmentation (or active) and recombination (or passive) regions. In order to synthesize the polymer films using the APPJs, it is very important to increase the density and electron temperature of the plasma during plasma polymerization [40; 41; 42; 43; 44]. Therefore, this study aims at designing a new generation of plasma-polymerized aniline (pPANI) nanoparticles and nanofibers using a simple and new atmospheric pressure plasma polymerization technique with high plasma energy and ultrafast deposition process. Instead of measuring the plasma density and electron temperature, the photo-sensor amplifier and optical emission spectrometer (OES) techniques were used to analyze the optical intensity and spectrums of reactive nitrogen peaks, respectively, for estimating the variations in the plasma energy states [44; 45; 46; 47; 48]. In this study, we propose the intense plasma cloud type atmospheric pressure plasma jets (iPC-APPJ) device with a single bundle of three glass tubes to enhance the plasma jets in fragmentation or recombination regions during plasma polymerization process.