Plasma optical emission spectroscopy in supercritical fluid for material synthesis process

Abstract

The optical emission spectra induced by plasma discharge in a supercritical carbon dioxide were measured. The Swan band associated with carbon dimers (C₂) was detected in addition to carbon monoxide, atomic carbon, and atomic oxygen, suggesting the decomposition of the carbon dioxide by the plasma discharge. The Swan band was found to broaden as the carbon dioxide pressure was increased. It was shown that the active C₂ species can be used for the synthesis of carbon-based materials.