Figure 1.

The XPS spectra. (a) Al 2p and O 1s peaks at the surface and in the bulk of the Al2O3 film. (b) Hf 4f and O 1s peaks at the surface and in the bulk of HfO2 film.

Fang et al. Nanoscale Research Letters 2013 8:92   doi:10.1186/1556-276X-8-92
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