Abstract
The goal of this research was to obtain high-density single-walled carbon nanotube forests (SWNTs) on conductive substrates for different applications, including field emission. For this, dip-coating was chosen as the catalyst deposition method, to subsequently grow SWNTs by Alcohol Catalytic Chemical Vapor Deposition (AC-CVD). Si (100) was chosen as the substrate, which was then coated with a TiN thin film. By sputtering with Ar, it was possible to generate alternating TiN and Si lanes, with a different wettability and, therefore, a different affinity for the catalysts. As a result, the Mo-Co catalyst was mainly deposited on TiN and not on sputtered-Si, which allowed the selective growth of SWNT forests on the TiN conductive surfaces. These as-synthesized SWNTs were used for field emission measurements in a high vacuum chamber.
Highlights
Carbon nanotubes (CNTs), can be considered cylinders of graphene rolled up into one or multiple layers, giving rise to materials with a variety of diameters and extraordinary properties
The synthesis of CNTs is considered a well-established technology, hundreds of papers are still published every year with the aim of improving these processes under different experimental conditions
Most industrial synthesis procedures are focused on the obtaining of bulk CNTs for applications in the development of composites or thin films, with unorganized architectures, which obviously limits their use in many other applications [14]
Summary
Carbon nanotubes (CNTs), can be considered cylinders of graphene rolled up into one or multiple layers (denoted single-walled, SWNTs, or multi-walled, MWNTs, carbon nanotubes), giving rise to materials with a variety of diameters and extraordinary properties. CNTs are among the most fascinating materials that have been synthesized, and have extraordinary physical properties that include a high aspect ratio [4], high mechanical strength [5], thermal stability [6,7], and very high electrical conductivity similar to that of copper [8] These properties make these materials of interest in applications in optics, the development of electrical circuits and transistors, field emission, mechanical engineering, pollution control, purification and filtering, sensors, energy storage, biomedical science, and even as a structural reinforcement in advanced composites [4,5,8,9,10,11,12,13]. CNTs of small diameter, and especially those with a single wall (SWNTs), have greater economic value, derived from their improved physical properties, greater field of applications, and greater difficulty of synthesis [14]
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