MANUFACTURE OF SOLID TANTALUM ELECTROLYTIC CAPACITOR

摘要

PURPOSE:To obtain a capacitor having excellent electric characteristics at a low cost by forming a conductive macromolecular film as a solid-state electrolyte on the surface of a tantalum sintered body on which a dielectric oxide film is formed. CONSTITUTION:A tantalum sintered body element on the surface of which a dielectric oxide film is formed is immersed into aqueous solution incorporating hydrogen peroxide and oxygen. Thereafter, the element is immersed into pyrrole monomer or into the solution of water-insoluble solvent containing pyrrole monomer. A polypyrrole film is formed by chemical oxidizing polymerization on the dielectric oxide film. Then, the element is immersed into electrolyte incorporating the pyrrole monomer and paratoluene sulfonate. Electrolytic polymerization is performed. Thus, a polypyrrole film formed by the electrolytic polymerization is formed on the polypyrrole film formed by the chemical oxidizing polymerization. In this way, the capacitor having the excellent electric characteristics is obtained.