Structure evolution from Prussian-blue nanocubes to hollow nanocage composites via sodium tungstate etching

Abstract

The formation path of hollow complex nanocages prepared via Na₂WO₄·2H₂O etching, using Prussian blue as a template, is tracked, which confirms the existence of a central cross structure inside the etching products. A mechanism based on etching along edges is described. The gas sensor designed with an Fe–W hollow complex exhibits excellent performance toward CH₃S₃CH₃.