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Cu2O crystals are synthesized hydrothermally with an eight-branched morphology, which can undergo a transition to a cubic shape by increasing the reaction time. The rapid branch formation of these structures is studied over time using scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, powder X-ray diffraction, and thermogravimetric analysis. The formation of Cu2+/polyvinylpyrrolidone soft matter clusters is shown to play a key role in the reduction of Cu2+, the nucleation of Cu2O crystals, and the rapid growth of branches along all eight equivalent directions of the cubic Cu2O structure, due to the presence of negatively charged hydroxyl sites on the {111} surfaces. This nonclassical crystal growth mechanism, which relies on aggregation of the precursor on the crystal surface, may help us to understand the formation of many abnormal crystal morphologies.

Surface Charge Driven Growth of Eight-Branched Cu2O Crystals

Surface Charge Driven Growth of Eight-Branched Cu₂O Crystals