A wealth of superfine single-crystal hollow cuprous oxide (Cu2O) spheres with nanoholes have been prepared for the first time with glucose as the reducing agent and gelatin as a soft template. The mechanism of the formation of these hollow crystals with nanoholes has been studied, and the UV–visible absorption spectrum has been used to resolve the excitonic or interband transitions of the hollow Cu2O spheres. The band gap of the products calculated from the UV–vis spectra is as large as 2.67 eV, which is ascribed to the decrease of the overall crystal size and the hollowing of the Cu2O spheres with nanoholes.
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Xu et al. (2006) studied this question.
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