Bio-inspired heterogeneous sensitization of bimetal oxides on SnO2 scaffolds for unparalleled formaldehyde detection

Abstract

Multi-heterogeneous oxide sensing layers, i.e., NiO/Fe₂O₃ catalyst loaded SnO₂ fiber-in-tube nanostructures (NiO/Fe₂O₃–FITs), were rationally synthesized from an electrospinning solution containing a bio-inspired chitosan–bimetal complex template. The NiO/Fe₂O₃–FITs showed remarkably enhanced sensing properties and superior cross-sensitivity toward sub-ppm levels of formaldehyde.