Figure 6. Analysis of cobalt-doped ZnO nanowires. (A) XRD of nanowires
with various cobalt doping concentrations. (B) Temperature-dependent EPR
spectra. Cobalt concentration ) 2.15 atom %. (C) Reciprocal intensity versus
temperature graph for the same sample as that used in B. Intensities were
obtained by numerical integration of the as-collected spectra twice. The
solid line is a plot of the Curie law, and the dashed line is fitted to the
higher-temperature data points. Reprinted with permission from ref 16.
Copyright 2005 Wiley-VCH.