Figure 4.

Normalized and fitted XPS core level spectra of oxygen 1s level. Normalized XPS core level spectra of oxygen 1 s level of undoped and Co-doped TiO2(a). Fitted XPS core level spectra of oxygen 1 s level of TiO2 film (b), Ti0.99Co0.01O2 film (c), and Ti0.97Co0.03O2 film (d).

Tian et al. Nanoscale Research Letters 2013 8:533   doi:10.1186/1556-276X-8-533
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