Achieving One Part Per Billion Hydrogen Sulfide (HS) Level Detection through Optimizing Composition and Crystallinity of Gold-Decorated Tungsten Trioxide (Au-WO) Nanofibers.

As a common environmental pollutant and an important breath biomarker for several diseases, it is essential to develop a hydrogen sulfide gas sensor with a low-ppb level detection limit to prevent harmful gas exposure and allow early diagnoses of diseases in low-resource settings. Gold doped/decorated tungsten trioxide (Au-WO) nanofibers with various compositions and crystallinities were synthesized to optimize HS-sensing performance. Systematically experimental results demonstrated the ability to detect 1 ppb HS with a response value (/) of 2.