Highly Selective Sensing of CO, C₆H₆, and C₇H₈ Gases by Catalytic Functionalization with Metal Nanoparticles

Abstract

We have fabricated multiple networked SnO₂ nanowires and subsequently decorated-them with uniformly distributed metal nanoparticles (NPs). The sensing tests indicated that the Pt-, Pd-, and Au-decorated SnO₂ nanowires exhibited excellent sensing behavior, specifically for C₇H₈, C₆H₆, and CO gases, respectively. We discussed the associated sensing mechanisms in regard to the selective catalytic effects of metal NPs. In addition, by means of d-band theory, we explained the catalytic capabilities of each metal and proposed design principles for exploring new catalytic metals. The present study will pave the way for further development of high-selectivity sensors.