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Keywords:

  • carbon-nitride;
  • nanocolumns;
  • sputtering

Abstract

Carbon-nitride nanocolumns were produced without catalyst metal by dc magnetron sputtering of a graphite target in pure N2 gas at pressure of 26.0 Pa on a quartz glass substrate kept at ∼200 °C. The nitrogen/carbon ratio in nanocolumns equals 0.18. Scanning electron microscopy shows that films represent dense nanostructure with columns ∼70–80 nm in diameter. The main fraction of the nitrogen is sp2-coordinated by carbon and enters into the graphene layers as substitutional atoms; the other fraction of the nitrogen facilitates a cross-linking between the graphene layers through sp3-coordinated carbon.