Fig. 4: Valence and coordination of Cu atoms in Cu/SWCNT.
From: Strain engineering of single-site Cu on SWCNTs for highly efficient diene cyclopropanation
a X-ray photoelectron spectroscopy (XPS) measurements of Cu 2p of Cu(acac)2, Cu/G and Cu/SWCNT; (b) Atomic-coloring Hirshfeld charge of Cu(acac)2 and Cu/SWCNT (for better visualization, the upper color limit of Cu is set to 0.60 a.u.); (c) X-ray absorption near edge structure (XANES) of Cu K-edge of Cu foil, Cu2O, Cu(acac)2 and Cu/SWCNT; (d) Fourier-transformed extended X-ray absorption fine structure (EXAFS) for Cu foil, Cu(acac)2 and Cu/SWCNT.
