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. 2020 Aug 7;11:3947. doi: 10.1038/s41467-020-17757-6

Fig. 4. X-ray photoelectron spectroscopy results.

Fig. 4

XPS spectra for ZIOS before and after copper adsorption (Cu 2p, O 1s, and N 1s binding energy curves) and for ZIF-8 after copper adsorption (Cu 2p binding energies).