  Patterned films of decorated nitrogenated carbon (C-N) nanotubes were
catalytically synthesised by hot filament chemical vapour deposition (HF-CVD)
in a nitrogen-methane-ammonia environment. The systematic study of a transition
between different kinds of C-N nanostructures as a function of the local
substrate temperature ranging from 700 up to 820C is presented. The morphology,
the diameter as well as the properties of the generated tubular structures
showed strong dependence on this parameter. By means of electron microscopy a
new type of decoration covering all tubular structures was observed. Buckled
lattice fringes revealed the disordered graphitic-like character of the hollow
C-N nanotubes. Raman spectroscopy confirmed a transition in the microscopic
order as a function of temperature. Furthermore field emission in vacuum was
studied and showed a spectacular correlation to the deposition temperature and
therefore the diameter of the C-N tubes. For arrays of tubes thinner than 50 nm
an onset field below 4 V/um was observed.
