X-ray diffraction patterns of the synthesized polypyrrole coated copper nanocables and copper chloride hydroxide powder. This figure shows the XRD patterns of the synthesized polypyrrole coated copper nanocables (top) and the copper chloride hydroxide powder (middle dark blue line). The upper red vertical ticks mark the Bragg positions for fcc single crystal copper (ICDD PDF No. 040–0836). The lower light blue vertical ticks show the Bragg peaks of the monoclinic single crystal CuOHCl precursor (ICDD PDF No. 077–0324).