cu(oh)2 ra cuo

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We report the synthesis of copper hydroxide (Cu(OH)₂) and cupric oxide (CuO) nanotubes arrays on a silicon wafer. It is the first time, to lớn the authors' knowledge, that Cu(OH)₂ and CuO tubes have been synthesized on another substrate than vãn a copper foil. Monocrystalline Cu(OH)₂ tubes were grown, on a homogeneous copper layer previously evaporated on the top of the wafer, by oxidation of this copper layer in two successive alkaline solutions containing Na(OH) and (NH₄)₂S₂O₈ each. The first solution is used to lớn control the tubes morphology and mật độ trùng lặp từ khóa on the wafer and the second one to lớn accelerate the tubes growth. By changing the first solution concentration, lengths between 3.5 μm and 6.6 μm were obtained and a mean external diameter close to lớn 100 nm could be reached. For such a low external diameter, the internal diameter was equal to lớn 75 nm. An annealing at 200 °C during 1 h under static air leads to lớn the dehydration of Cu(OH)₂ tubes into CuO ones. The morphology of the tubes before and after annealing is almost identical, so sánh it is possible to lớn obtain CuO nanotubes with a mean external diameter around 100 nm. This value is much smaller than vãn the diameters of several hundred nanometers published up to lớn now for CuO tubes. After annealing, the presence of Cu₂O, due at least partially to lớn a diffusion phenomenon at the interface copper layer/CuO, has been detected.