Solvothermal preparation of Cu2O crystalline particles

Abstract A solvothermal process has been developed to prepare both the cubic single crystals and the spherical polycrystals of Cu 2 O by the reduction of CuSO 4 ·5H 2 O with d -glucose as a reductant in the presence of the different organic additives such as ethylene glycol, polyethylene glycol 200 (PEG-200), polyethylene glycol 400 (PEG-400), polyethylene glycol 10000 (PEG-10000), polyethylene glycol 20000 (PEG-20000) or polyvinyl pyrrolidone (PVP K-30). All the products were characterized using X-ray diffraction and transmission election microscopy. The organic additives were found to play a key role in the formation of the Cu 2 O crystals and lead to the different microstructures of the resultant Cu 2 O. Two different mechanisms, diffusion mechanism and aggregation mechanism, were used to explain the formation of single crystals and polycrystals of Cu 2 O, respectively. When PEG-10000, PEG-20000 or PVP K-30 was added into the reaction system, a diffusion mechanism contributes to the formation of the single crystals of Cu 2 O, while aggregation mechanism prevails in the polycrystals of Cu 2 O with EG, PEG-200 or PEG-400. The pH of the mixture was also found to be a key factor in deciding the final products.

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