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XPS analyses. (A) O1s spectra, (B) O1s peak deconvolution of O3, (C) P2p, and (D) Ca2p spectra. BE: binding energy, Bare: untreated PEEK, O3: ozone-gas-treated PEEK, O3-P: phosphate-immobilized PEEK, O3-Ca: calcium-immobilized PEEK, O3-PCa: phosphate and calcium co-immobilized PEEK.
