XPS spectra represented by lines of different colors. (a) XPS survey spectra, high-resolution scan of S 2p (b) and Cd 3d (c) of samples S1 and S5. Absence of magnetic elements Fe, Co, and Ni has been confirmed by the core-level XPS spectra of Fe 2p (d), Co 2p (e), and Ni 2p (f).
Yang et al. Nanoscale Research Letters 2013 8:17 doi:10.1186/1556-276X-8-17