Supplementary information

From the following article:

Microwave devices: Carbon nanotubes as cold cathodes

Kenneth B. K. Teo, Eric Minoux, Ludovic Hudanski, Franck Peauger, Jean-Philippe Schnell, Laurent Gangloff, Pierre Legagneux, Dominique Dieumegard, Gehan A. J. Amaratunga & William I. Milne

Nature 437, 968(13 October 2005)

doi:10.1038/437968a