Figure 4.

a XPS spectra of Zn0.989Fe0.011O NDs, the insert shows the Fe 2p XPS core-level spectra; O 1s XPS core-level spectra of b undoped ZnO NDs, c Zn0.989Fe0.011O NDs, and d Zn0.983Fe0.017O NDs

Yang et al. Nanoscale Research Letters 2009 5:247-251   doi:10.1007/s11671-009-9473-9