Controlled synthesis of Cu2O cubic and octahedral nano- and microcrystals by Zhenghua Wang, Hui Wang, Lingling Wang, and Ling Pan

Crystal Research and Technology

Cryst. Res. Technol. 44, 624 (2009) - Abstract -

Controlled synthesis of Cu2O cubic and octahedral nano- and microcrystals

Zhenghua Wang, Hui Wang, Lingling Wang, and Ling Pan

Anhui Key Laboratory of Functional Molecular Solids, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, P. R. China

Keywords	crystal morphology, nanostructures, oxides, semiconducting materials
PACS	81.05.Dz, 81.20.Ka
DOI	10.1002/crat.200900136

Cubic and octahedral Cu₂O nano- and microcrystals were selectively synthesized via a simple wet chemical reduction route at room temperature, with CuCl₂ and NaOH as starting reactants, and ascorbic acid or hydrazine hydrate as the reducer. Hydrazine hydrate could be preferentially adsorbed on different crystal faces of Cu₂O, affecting the growth rate along the <100> to that along the <111> direction, which resulted in the formation of octahedral Cu₂O crystals. When ascorbic acid was used as the reducer, the growth rate along the <100> to that along the <111> direction was different, which resulted in the formation of cubic Cu₂O crystals. The size of cubic and octahedral Cu₂O crystals could be varied by adjusting the molar ratio of OH^– to Cu²⁺.

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