Figure 3
From: Nanocontainers made of Various Materials with Tunable Shape and Size

Structural characterization of the four types of carbon nanocontainers.
(a–c) SEM images of a carbon nanofunnel, a carbon nanobottle and a carbon nano-separating-funnel, respectively. (d) TEM image of a carbon nanodropper. (e) HRTEM image of the carbon nanodropper wall taken from the rectangular area marked in (d). (f) HRTEM image of the carbon nanodropper wall, where CVD was conducted at 800°C. The insets in (a–d) show schematics of AAO pores used for the synthesis of the carbon nanocontainers, with anodizing conditions marked on the right of the pores.