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A new cathode for cold-field emission gun using a pyrolytic carbon-cone supported onto a carbon nanotube as the electron emitting tip has been developed. This tip was mounted in a TEM using a FIB based method, and the brightness measured under real operating conditions is five times better than obtained with a standard tungsten tip. Its use overcomes the many technical difficulties which have dogged...
We used low-voltage transmission electron holography to probe surface electrostatic potentials in graphene membranes and carbon nanotubes, as the number of graphenes varies. Further, we measured the phase shift induced by an individual graphene, and mapped the phase shift variation throughout a whole few-graphene-crystal as a function of the local number of layers. We found a size/surface effect as...
The adhesion of single-walled carbon nanotubes to the surface of graphene has been studied, mixing shortened tubes of different chiralities and few-graphene crystal membranes. The spontaneous atomic match of the two lattices was directly imaged using high-resolution transmission electron microscopy and carefully analyzed by means of electron diffraction, and we found evidences that surfaces of few-graphene...
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