The Preparation of Stable Colloidal Poly(vinyl alcohol) Composites of Cu2O and Cu

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Abstract
Stable colloidal particles of reddish brown Cu2O–PVA and grayish black Cu–PVA composites have been prepared by the reduction of green Cu2+–PVA complexes in aqueous solutions with hydrazine, at the [hydrazine]/[Cu2+] ratios of 1–3 and 15 or more respectively, where PVA represents poly(vinyl alcohol). The average diameters of the Cu2O and Cu particles in these composites have been estimated to be about 200 and 300 Å respectively from the half widths of the X-ray diffraction peaks for the corresponding powder samples.