Angular distribution of field emitted electrons from vertically aligned carbon nanotube arrays

Mohamed M El Gomati, S. Iacobucci, M. Fratini, A. Rizzo, F. Scarinci, Y. Zhang, M. Mann, C. Li, W. I. Milne, S. Lagomarsino, G. Stefani

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Angular field emission (FE) properties of vertically aligned carbon nanotube arrays have been measured on samples grown by plasma enhanced chemical vapor deposition and characterized by scanning electron microscope and I-V measurements. These properties determine the angular divergence of electron beams, a crucial parameter in order to obtain high brilliance FE based cathodes. From angular distributions of the electron beam transmitted through extraction grids of different mesh size and by using ray-tracing simulations, the maximum emission angle from carbon nanotube tips has been determined to be about ± 30° around the tube main axis.
Original languageEnglish
Pages (from-to)053116
JournalApplied Physics Letters
Early online date2 Feb 2012
Publication statusPublished - 2 Feb 2012

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