Under the assumption of spherical shape R 1 = R 2 = R and resolving the Young–Laplace equation for the new radii R (nm), we estimate the new Δ Δ P (GPa). The smaller the radii, the greater the pressure is present. The increase in pressure at the nanoscale results in strong forces toward the interior of the particle. Consequently, the molecular structure of the particle appears to be different from the bulk mode, especially at the surface. These abnormalities at the surface are responsible for changes of inter-atomic interactions and bandgap.