Spatially resolved electron energy loss spectroscopy on n-type ultrananocrystalline diamond films

Arenal, R.; Stephan, O.; Bruno, P.; Gruen, D. M.
March 2009
Applied Physics Letters;3/16/2009, Vol. 94 Issue 11, p111905
Academic Journal
The addition of nitrogen to the synthesis gas during synthesis of ultrananocrystalline-diamond (UNCD) films results in films uniquely exhibiting very high n-type electrical conductivity even at ambient temperatures. This result is due to the formation of nanowires having elongated diamond core nanostructures and a sp2-bonded C sheath surrounding the core. The work presented here provides detailed confirmation of this important result through spatially resolved-electron energy loss spectroscopy. The direct observation of nitrogen incorporated in the sheath has been enabled. The incorporation of this nitrogen provides strong support to a plausible mechanism for the n-type conduction characteristic of the UNCD films.


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