XRD patterns of the non-annealed (sample 1) and annealed samples (samples 2 and 3). The patterns are shifted vertically for clarity. The annealed samples show the presence of NiO peaks. The reflexes of Ni are still observed and arise from the incomplete oxidation of the Ni supporting layer. The stars and tick marks denote the Au-Ni alloy and Au, respectively.
Dar et al. Nanoscale Research Letters 2013 8:363 doi:10.1186/1556-276X-8-363