CrO2 by XPS: Comparison of CrO2 Powder to CrO2 Films on TiO2(110) Single Crystal Surfaces

Chromium dioxide is a ferromagnetic metallic oxide utilized in data storage applications. Here, the XP spectrum of CrO2 bulk powder is compared to a CrO2(110) film grown on a TiO2(110) single crystal surface by chemical vapor deposition. The spectra compare the Cr 2p and O 1s regions for the two materials. In both materials, the Cr 2p region (2p3/2 = 576.4 ± 0.1 eV and Cr 2p1/2 = 578.6 ± 0.1 eV) is asymmetric and broadened to the high binding energy side, consistent with metallic material. The O 1s envelope for both materials consists of two components. The lower BE component, at 529.2 ± 0.1 eV, has been assigned to the oxide and the higher binding energy component, at ∼531.5 eV, is believed to be associated with an adsorbed water or hydroxide layer.