고분산성 Cr2O3 및 Co3O4 전이금속 나노입자 촉매가기능화된 다공성 WO3 나노섬유를 이용한 구취진단용화학센서

Abstract

In this work, we prepared porous WO3 nanofibers (NFs) functionalized by bio-inspired catalytic Cr2O3 and Co3O4 nanoparticles as highly sensitive and selective H2S gas sensing layers. Highly porous 3-dimensional (3D) NFs networks decorated by well-dispersed catalyst NPs exhibited superior H2S gas response (Rair/Rgas = 46 at 5 ppm) in high humidity environment (95 %RH). In particular, the sensors showed outstanding H2S selectivity against other interfering analytes (such as acetone, toluene, CO, H2, ethanol). Exhaled breath sensors using Cr2O3 and Co3O4 catalysts-loaded WO3 NFs are highly promising for the accurate detection of halitosis.