Stable electron emission from amorphous diamond film at a low threshold field of 6-7 mV m -1 has been observed using a transparent anode technique. The electron emission characteristics are discussed in terms of the structural properties of films. Using scanning electron microscopy and Raman spectra, the emitting and the non-emitting regions of the amorphous diamond film are analysed. The emitting regions exhibit rougher microstructure in morphology and a stronger Raman peak at 1360 cm -1 than the non-emitting regions, a signature of having more micro-sp 2 components. It is suggested that field emission is prone to take place at the regions containing more sp 2 nanoclusters or nanocrystalline graphite.
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Xu et al. (2000) studied this question.
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