CHARACTERISTICS OF ZINC-OXIDE POWDERS PRECIPITATED IN THE PRESENCE OFALCOHOLS AND AMINES

Zinc oxide powders have been prepared by adding acidic ZnCl2 solutions to NaOH solutions containing alcohol or amines. The physical characte ristics of the powders (particle size and morphology) are conditioned by the presence of the organic molecules. These effects are related to particular growth mechanisms involving an active role of the organic additives. The presence of agglomeration in the powders obtained allow s the obtention of low density samples with open porosity suitable for use as atmospheric sensors.