Cuo + ca(oh)2 = cu(oh)2 + cao

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* Corresponding authors

a Nanomatériaux pour les Systèmes Sous Sollicitations Extrêmes (NS3E), UMR 3208 ISL/CNRS/UdS, French-German Retìm kiếm Institute of Saint-Louis, 5, rue du Général Cassagnou, 68300 Saint-Louis, France E-mail: denis.spitzer

We report the synthesis of copper hydroxide (Cu(OH)2) & cupric oxide (CuO) nanotubes arrays on a silibé wafer. It is the first time, lớn the authors" knowledge, that Cu(OH)2 and CuO tubes have sầu been synthesized on another substrate than 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 lớn control the tubes morphology and mật độ trùng lặp từ khóa on the wafer & the second one khổng lồ accelerate the tubes growth. By changing the first solution concentration, lengths between 3.5 μm và 6.6 μm were obtained & a mean external diameter cđại bại khổng lồ 100 nm could be reached. For such a low external diameter, the internal diameter was equal khổng lồ 75 nm. An annealing at 200 °C during 1 h under static air leads to lớn the dehydration of Cu(OH)2 tubes inkhổng lồ CuO ones. The morphology of the tubes before và after annealing is almost identical, so it is possible to lớn obtain CuO nanotubes with a mean external diameter around 100 nm. This value is much smaller than the diameters of several hundred nanometers published up lớn now for CuO tubes. After annealing, the presence of Cu2O, due at least partially to a diffusion phenomenon at the interface copper layer/CuO, has been detected.

Chuyên mục: Tổng Hợp