Fig. 4. (Color online) XPS spectra of NNHO160 and the samples annealed at 300 °C, 500 °C and 700 °C. The spectra of (a) Ni 2p region, (b) O1s region.

New Phys.: Sae Mulli 2021;71:500~505 https://doi.org/10.3938/NPSM.71.500

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