Method for preparing electrically-conductive needle-like zinc oxide

Herein disclosed is a method for preparing electrically-conductive needle-like zinc oxide which comprises the steps of preparing a vapor mixture by admixing zinc vapor and vapor of at least one compound selected from the group consisting of dopant-forming compounds having boiling points of not more than the boiling point of zinc and free of oxygen atom in an amount of 0.005 to 5 parts by weight, as expressed in terms of the oxide of the dopant-forming metal, per 100 parts by weight of the zinc vapor as expressed in terms of zinc oxide; and passing the vapor mixture through an oxidation chamber while blowing an oxidizing gas into the vapor mixture through at least two nozzles spaced apart from one another and arranged along the flow path of the vapor mixture to thus stepwise oxidize the vapor mixture.