Fig. 2From: Facile Synthesis of Ligand-Free Iridium Nanoparticles and Their In Vitro BiocompatibilityIridium(III) chloride appears pale yellow with absorbance peaks at 324 and 386 nm. IrNPs are broad-spectrum absorbers and appear black. Iridium oxide (predicted), produced from oxidized IrNPs treated in a basic solution, appears blue-purple purple with an absorbance peak at 584 nmBack to article page