Controllable Pressure Hydrothermal Synthesis Of Cuprous Oxide Microstructures

In recent years, there has been increasing interest in the synthesis of inorganic micro- or nanocrystals for their widely ranged properties and potential applications。The synthesis of inorganic micro- or nanocrystals with controlled size and shape is of special interest.As a p-type semiconductor (direct band gap～2.17 eV) with unique optical and magnetic properties, Cu₂O is a promising material with potential applications in solar energy conversion, magnetic storage device, catalysis micro-/nanoelectronics, and biosensing. Many recent efforts have been devoted to the shape-controlled synthesis of Cu₂O micro- and nanocrystals. Systematic manipulation of the morphology and architecture of Cu₂O microcrystals has been achieved using solution routes and electro deposition methods. Meanwhile, various approaches have been reported for fabricating Cu₂O nanocrystals with varied morphologies, such as cubes, pyramids, wires, boxes, cages. We use the hytrothermal method combined with certain pressures, surmmarized the rules of the precursor concentrations and the initial pressure on it.Discuss the mechanism of the morphologies ,which the pressure was related on .Discuss the light property of the as-obtain samples. Therefor, we get some interesting results.Here, we report a novel route for the synthesis of"fiber-like"Cu₂O bundle and"tower-like"Cu₂O microcrystals in aqueous solution using Cu(CH₃COO)2·H₂O as the precursor only and assisted with certain pressure. In the present paper, a newly discovered Cu₂O morphology"fiber-like"Cu₂O bundles and"tower-like"Cu₂O micro-crystals were reported. The effects of precursor concentration, reaction pressure and reaction time on the evolution of Cu₂O synthesis and the morphology are discussed.We use various testing methods to character our samples, including SEM,XRD,TEM and UV-Vis.The experimental conditions, imposed pressures, product phases, and the Cu₂O morphologies are dicussed . It shows that the outside pressure used is the critical factor for the synthesis of novel morphologies. Cu₂O was easily prepared under hydrothermal conditions assisted with a certain pressure, when Cu(CH₃COO) 2 was used alone as the precursor.The experiments results showed that these variable parameters play an important role in the formation of Cu₂O morphology and affect the products qualities greatly. Comparing the time parameter,we found that the initial product was CuO,then ,on the effect of the reduction of the CH₃COOH, CuO was reduced to the Cu₂OAt the same time, the optimal synthesis parameters were given, which was found to play a key role in determining the morphologies and crystallinity of Cu₂O.