Toyota Jidosha Kabushiki Kaisha

Centre National De La Recherche Scientifique

Marc Monthioux

Takuya Kondo

Yasushi Yamazawa

Florent Houdellier

Yoshinao Suzuki

Yasunori Sakurabayashi

Mikako Le Lay

A field-emission electron gun including an electron emission tip, an extractor anode, and a mechanism creating an electric-potential difference between the emission tip and the extractor anode. The emission tip includes a metal tip and an end cone produced by chemical vapor deposition on a nanofilament, the cone being aligned and welded onto the metal tip. The electron gun can be used for a transmission electron microscope.

Electron gun emitting under high voltage, in particular for electron microscopy

A method is presented for effectively manufacturing multi-wall (double-wall, etc.) carbon nanotubes (CNTs) having a structure whereby interior tubes are formed within the CNTs. In this manufacturing method, fullerene/CNT hybrid structures are prepared, wherein assembled fullerenes, these being fullerenes that are linked, have been housed within single-wall CNTs. The interior tubes are formed from the assembled fullerenes by subjecting the hybrid structures to electron beam irradiation while in a heated state. It is preferred that irradiation with the electron beams occurs at a temperature of 100&#x2dc;500&#xb0; C. and with the electron beams having an accelerating voltage of 80&#x2dc;250 kV. According to the manufacturing method of the present invention, multi-wall CNTs with few defects can be manufactured at lower temperatures and in a shorter period than in the case where the fullerene/CNT hybrid structures are only maintained under high temperature conditions (and electron beam irradiation is not performed).

Methods for manufacturing multi-wall carbon nanotubes

Growing community of inventors

Aussonne, France

Marc Monthioux