Figure 1.

XPS survey spectra of TM-doped TiO2 thin films. (a) Ni-doped TiO2. (b) Co-doped TiO2. (c) Fe-doped TiO2.

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