Abstract

Nitrogen-doped chemical vapour deposited diamond-like carbon (DLC) filmswere treated by reactive ion etching system under various conditions ofCHF3 gas successively after pre-treatment with oxygen. Atomic force microscopy and Ramanspectroscopy were carried out in order to characterize the surface morphology and chemicalbond, respectively. Scanning tunnelling microscopy was used in order to investigate thesurface state of the DLC films at the nanoscale level. Scanning probe field emission currentmeasurement was performed in order to obtain the emission current mapping.The emission sites appeared to a great extent after the surface treatment byCHF3 gas and a clear activation effect was observed. We confirmed that the surface treatment usingCHF3 gas affected not only the appearance of emission sites but also the activation process.

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