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. 2016 May 19;6:26432. doi: 10.1038/srep26432

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(a) XRD pattern of NiC₂O₄·2H₂O. (b,c) Typical FESEM images of NiC₂O₄·2H₂O nanotubes. (d) XRD pattern of NiO. (e,f) Typical FESEM images of NiO nanotubes. (g) The TEM image of a single NiO nanotube. (h) Corresponding SAED pattern of NiO nanotubes. (i) HRTEM image of NiO nanotubes.