Abstract

We have developed a simple method for tuning the morphologies of <TEX>$Cu_2O$</TEX> microcrystals. <TEX>$Cu_2O$</TEX> microcrystals were prepared by precipitation at room temperature from a mixture of <TEX>$Cu(CH_3COO)_2{\cdot}H_2O$</TEX>, N,N,N',N'-tetramethyl ethylenediamine (TMEDA), ascorbic acid, and polyethylene glycol (PEG). TMEDA was used to promote the formation of copper-TMEDA complexes. A variety of <TEX>$Cu_2O$</TEX> microcrystal morphologies were obtained simply by varying the concentrations of TMEDA and ascorbic acid. Aggregated <TEX>$Cu_2O$</TEX> microspheres are formed at higher concentrations of ascorbic acid in the absence of TMEDA. Aggregated <TEX>$Cu_2O$</TEX> microcubes are formed at lower concentrations of ascorbic acid and higher concentrations of TMEDA. The crystal growth mechanism of these <TEX>$Cu_2O$</TEX> morphologies is explained.

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