Variations in structure and emission characteristics of nanostructured carbon films prepared by HFCVD method due to the addition of ammonia in source gases

We investigated the structural variation and the concomitant change in the emission characteristics of HFCVD-grown nanostructured carbon films induced by the addition of ammonia to source gases; nanostructured films were the mixture of nanotubes and nanoclusters. As the concentration of ammonia was increased, large structural variation, including the increase of disorder in the atomic bonding and the decrease in size of graphitic sheets making up nanotubes and nanoparticles, was observed. Moreover, changes in the emission properties corresponding to the structural degradation was observed.