Table 3. Area ratios of the peaks obtained by decovoluting the XPS O 1s spectra for the plasma-treated zirconia surfaces and that of the control.

	Area ratios of the deconvoluted peaks in O 1s spectra
	530.1 eV	531.2 eV	532.5 eV
30 s	1.67	42.43	55.90
60 s	10.44	22.44	67.12
90 s	38.81	25.60	35.59
c	21.86	30.59	47.55