Physics Abstracts

Abstract. 2014 Energy-filtering transmission electron microscopy was applied to carbon nanotubes in order to investigate quantitative property of elemental maps obtained by inelastically scattered elec-trons corresponding to the carbon K-edge. An 1 MeV high-resolution electron microscope (JEOL, ARM-1000) equipped with a GATAN imaging filter was employed. Because of a cylindrical structure of nanotubes the number of carbon atoms contributing to the image changes across the tube axis. We could detect the contrast difference due to 20 carbon atoms in the carbon distribution image of 6 lay-ers tube. Furthermore, we examined the carbon mapping from a conical tip region with progressive closure of carbon layers, where an intensity profile clearly distinguishes the difference of 6 graphene sheets. From the consideration of signal-to-noise ratio, the detection limit is concluded to be less than 22 carbon atoms in the present experimental conditions