Carbon Reportsに研究成果が掲載されました

Molecular-level understanding of carbon materials by temperature-programmed desorption

https://doi.org/10.7209/carbon.020203

A wide variety of surface functional groups, such as oxygen-containing ones and hydrogen, exist at the graphene edge sites of carbon materials. Because the presence of these functional groups greatly affects the chemical properties of carbon-based materials produced from them, knowledge of the edge site state is essential to understand carbon chemistry. This review describes the analyses of edge sites and carbon-material structures by temperature-programmed desorption (TPD). Deuterium labeling of the protonic hydrogen of oxygen-containing functional groups enables the precise identification of the chemical structure of edge sites. Furthermore, the spatial distribution of edge sites in the carbon structure can be determined by the kinetic analysis of H2 desorption spectra collected at temperatures above 1000 °C. The average size of graphene sheets forming the carbon can be estimated from the number of edge sites. The TPD-based analytical approaches described in this paper help provide a better understanding of the carbon structure at the molecular level.