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. 2015 Dec 22;10(12):e0144964. doi: 10.1371/journal.pone.0144964

Fig 8. X-ray photoelectron spectroscopy data showing binding energy.

Fig 8

(a) Zinc, Zn 2p (b) gold, Au 4f (c) gold, Au 4d and (d) oxygen, O1s electrons.