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. 2018 Sep 17;8(56):32146–32156. doi: 10.1039/c8ra06075d

Relative proportions of Fe(0) and Fe(ii/iii), Fe(ii/iii)/Fe(0) ratio calculated from XPS analyses for Fe core, Fe@SiO2 NPs and Fe@SiO2 NPs exposed to air and water.

Sample Fe (0) (rel. %) Fe(ii/iii) (rel. %) Fe(ii/iii)/Fe(0)
Fe NPs 40.8 59.2 1.5
4 7.9 92.1 11.7
4-Air 5.5 94.5 17.2
4-Water — 100 —