Theoretical investigations of surface reconstruction on C nanodiamonds and cubic-BN nanoparticles

• Nanodiamonds and cubic-BN nanoparticles were modeled using density functional theory.
• Geometry optimization led to nanocage formation and flat graphitic sections.
• Nanocages formed primarily on (111) surfaces of both C and BN particles.
• Further cage formation and growth occurred during molecular dynamics simulations.

Using first-principles DFT calculations, we have investigated morphology effects on the properties due to surface reconstruction of C nanodiamond and cubic-BN nanoparticles. Geometry optimization of simple sphere-like nanoparticles leads to spontaneous formation of nanocages on the particle surfaces. Differences are seen at B and N 3-fold surface sites, which are flat and pyramidal, respectively. Thermal annealing using quantum molecular dynamics simulations shows nanocage formation in both materials, primarily on (111) surfaces.

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