Table 2: Atomic percentages of Ti2p and O1s obtained from XPS spectra along with the atomic ratio of oxygen to titanium in the structure.

SampleTi2p3/2 atomic % O1s(a) atomic % O1s(a): Ti2p3/2 ratio

TAD11.132.42.92
T50017.9129.411.64
T60016.6925.091.50
T70014.3821.731.51
T80010.5119.041.81