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XPS analysis (a) full scan spectrum of PBS, MPBS and MPBS/CNT-ZNP nanocomposite (b) narrow scan of PBS, MPBS and MPBS/CNT-ZNP nanocomposite (c) C1s for MPBS (d) C1s for MPBS/CNT-ZNP (e) O1s for MPBS (f) O1s for MPBS/CNT-ZNP.