“…The synthesis of transitional metal oxide nanostructures with controlled morphology and texture has attracted a great deal of interest in the field of nanotechnology. [19][20][21] In particular, copper oxide (CuO), an important p-type transition metal oxide semiconductor with a narrow band gap (E g = 1.2 eV) and an unconventional band structure has received much attention due to its various applications in different fields of solar energy cells, 22,23 electronics, 24,25 gas sensing, 26,27 bio-sensing, [28][29][30] heterogeneous organic catalysis, [31][32][33] lithium-ion electrode materials, 34,35 super conductors 36 and so on. Therefore, the synthesis of nanostructured CuO has attracted considerable attention in recent years.…”