ИСТИНА

Present work summarizes experimental data on thermodynamic properties of different carbon nanomaterials (CNMs) and demonstrates the correlations between their structure/physico-chemical properties and experimentally observed enthalpy of formation ∆fH0298. Carbon nanotubes (CNTs), nitrogen doped CNTs (N-CNTs), as well as multi-layer graphites (carbon nanoflakes, CNFs) together with N-doped ones (N-CNFs) and their 3D frameworks obtained by spark plasma sintering (SPS) are considered. The most thermodynamically stable macroform of carbon is graphite. Diamond is a metastable allotropic modification with positive enthalpy of formation of 1.89±0.05 kJ.mol-1. However, the carbon nanoclusters with diamond structure are thermodynamically more favorable than macrodiamond.