Invisible Ink from ZnO Waste Batteries

Abstract

Zn metal is the base on ZnO making as I invisible ink. Zn metal can be obtained from battery waste and become the target of this research. Synthesis of nanoparticles through several stages is the determination of stirring time, characterization and application of ZnO as invisible ink. Colonized white ZnO colloidal nanoparticles, optimum agitation time of 60 minutes, particle size 10.03-46.24 nm, gap energy of 3.5 eV. The wrutzite hexagonal crystalline lattice system. The ZnO nanoparticle colloid application provides a purple glow on yellow filter paper and luminescence for HVS paper, cardboard, and bill.