Gas Phase Synthesis of Linearly Aggregated Cobalt-Containing Organosilicon Fine Particles

Abstract

A gaseous mixture of cobalt tricarbonyl nitrosyl (Co(CO)₃NO) and allyltrimethylsilane (ATMeSi) produced sedimentary aerosol particles under UV light irradiation with a medi- um pressure mercury lamp at 313 nm and also with the third and fourth harmonics of a Nd:YAG laser. From the analysis of FT-IR band intensity change of the gaseous molecules, it was shown that photochemical reactions of Co(CO)₃NO were accelerated by the pres- ence of ATMeSi molecules. Chemical structure of the sedimentary particles was analyzed by FT-IR and EDX-SEM. The results showed that the sedimentary particles consisted mainly of Co compounds, and a small amount of ATMeSi molecules played an essential role to form spherical particles. Linearly aggregated fine particles (particle-wires) were formed by modulating the convectional flow of the gaseous mixture.