Carbon Microstructures Synthesis in Low Temperature Plasma Generated by Microdischarges

Abstract

The aim of this paper is to investigate the process of growth of different carbon deposits in low-current electrical microdischarges in argon with an admixture of cyclohexane as the carbon feedstock. The method of synthesis of carbon structures is based on the decomposition of hydrocarbons in low-temperature plasma generated by an electrical discharge in gas at atmospheric pressure. The following various types of microdischarges generated at this pressure were tested for both polarities of supply voltage with regard to their applications to different carbon deposit synthesis: Townsend discharge, pre-breakdown streamers, breakdown streamers and glow discharge. In these investigations the discharge was generated between a stainless-steel needle and a plate made of a nickel alloy, by electrode distances varying between 1 and 15 mm. The effect of distance between the electrodes, discharge current and hydrocarbon concentration on the obtained carbon structures was investigated. Carbon nanowalls and carbon microfibers were obtained in these discharges.

Self-Organization and Nitrogen Incorporation in Diamond-Like Carbon Microstructures Synthesized by Nonthermal Plasma

“…SEM images of the pure hydrocarbon microstructures (Figures b–c and S2) show a rough, “cauliflower-like” surface, which is typically seen in other types of plasma-grown carbon structures. − In contrast, the SEM images of the a -C:H:N microstructures (Figure S3) show much smoother features, which suggests that they are composed of viscous polymers rather than a glassy amorphous carbon. The EDX spectrum of 0N-15W shows a small oxygen peak, which is an artifact of the adhesive substrate and is not representative of the sample (Figure S4a–b).…”

Features of Raman light scattering spectra in the 2100 cm-=SUP=--1-=/SUP=- line region by carbon formations in thin gradient gold films

“…We believe that carbon structures in our cases could be formed initially in the atmosphere of electric discharge in the gas that filled the chamber. Many studies have confirmed the possibility of carbon structure formation from vapors in electric discharge [22][23][24][25]. In particular, in [23] it has been reported the formation of polyynes in a product formed in the discharge.…”

Особенности спектров комбинационного рассеяния света в области линии 2100 cm-=SUP=--1-=/SUP=- углеродными образованиями в тонких градиентных пленках золота

“…Мы считаем, что углеродные структуры в нашем случае могли изначально формироваться в атмосфере электрического разряда в наполнявшем камеру газе. Имеется достаточное количество работ, подтверждающих возможность образования углеродных структур из паров углеводородов в электрическом разряде [22][23][24][25]. В частности, в [23] в образовавшемся в разряде продукте было зафиксировано образование полиинов.…”