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Crossing multiwalled carbon nanotubes are connected by irradiating the junction in a scanning electron microscope. The aggregation of hydrocarbons and successive transformation into amorphous carbon under the electron beam is used to solder nanotubes and to make a mechanical junction. Transmission electron microscopy is carried out to study the graphitization of the junction under further irradiation or annealing.
Florian Banhart (Fri,) studied this question.