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Epitaxial cuprous oxide, Cu2O, nanocrystals are deposited electrochemically onto n-InP(001). The lattice of the Cu2O is rotated 45° around the common [001] axis normal to the substrate plane. The shape of the Cu2O nanocrystals depends on the pH of the solution. Nanopyramids form at pH 9, and nanocubes form at pH 12.
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Liu et al. (2003) studied this question.
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