Fig. 3. (a) Wide-angle PXRD patterns, (b) Raman spectra, and (c) N2 adsorption–desorption isotherms of the non-hollow carbon nanoparticles and hollow carbon nanobubbles. The pore size distribution of the hollow carbon nanobubbles is calculated by the non-local density functional theory (NLDFT) method, as shown in the inset of (c).
