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XPS survey scans for all four VACNT preparations. (a) XPS survey scans for the Fe (blue), Fe+Pl (red), Al/Fe (yellow), and Al/Fe+Pl (purple) preparations. All preparations clearly feature the C 1s peak at 284.8 eV. Additionally, the oxygen functionalized preparations feature an O 1s peak near 533 eV. (b) XPS Fe 2p3/2 scans. Background signal is shown for each scan in green. For reference, the binding energy of metallic Fe is 706.7 eV and that of Fe2O3 is 710.8 eV.
