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Herein, we report that octahedral and spherical Cu 2 O samples with hollow structures are synthesized in high yield by reducing Cu(EDA) 2  2+  complex with hydrazine. A series of experiments are carried out to investigate the factors which impact on the morphology of the Cu 2 O samples. It is observed that ethylenediamine (EDA) serves as a molecular template in the formation of hollow structure. Octahedral Cu 2 O with solid structure is prepared without EDA. When EDA is added, Cu 2 O sample with hollow structure is formed. Different morphologies of Cu 2 O such as spherical and octahedral could be obtained by adjusting the concentration of EDA and NaOH. The temporal crystal growth mechanism is proposed. Furthermore, the photocatalytic activities of the as-prepared Cu 2 O nanoparticles are evaluated by monitoring two dyes (methyl orange and congo red) using UV-visible spectrophotometer. Results show that the order of photocatalytic activity of Cu 2 O with different morphologies is as follows: hollow octahedral morphology > hollow sphere morphology > solid octahedral morphology. The hollow octahedral Cu 2 O nanoparticles would be a promising material on applications for photocatalytic degradation of organic pollutants.

Facile synthesis of hollow Cu2O octahedral and spherical nanocrystals and their morphology-dependent photocatalytic properties