Ultrasensitive H2S gas sensors based on p-type WS2 hybrid materials

• DOI: 10.1007/s12274-018-2009-9
• Publication Date: 2018-02-20T18:05:55Z
• Authors: Georgies Alene Asres; José J. Baldoví; Aron Dombovari; Topias Järvinen; Gabriela Simone L...; Melinda Mohl; Andrey Shchukarev; Alejandro Pérez Paz; Lede Xian; Jyri-Pekka Mikkola; Anita Lloyd Spetz; Heli Jantunen; Ángel Rubio; Krisztian Kordás
• Keywords: Nanomaterials; Resistive touchscreen; Chemical Stability; Lattice (music)

Owing to their higher intrinsic electrical conductivity and chemical stability with respect oxide counterparts, nanostructured metal sulfides are expected revive materials for resistive sensor applications. Herein, we explore the gas sensing behavior of WS2 nanowire-nanoflake hybrid demonstrate excellent sensitivity (0.043 ppm-1) as well high selectivity towards H2S relative CO, NH3, H2, NO (with corresponding sensitivities 0.002, 0.0074, 0.0002, 0.0046 ppm-1, respectively). Gas response measurements, complemented results X-ray photoelectron spectroscopy analysis first-principles calculations based on density functional theory, suggest that electronic properties pristine alone not sufficient explain observed H2S. A major role in this is also played by O doping S sites lattice. The present study open up new avenues use transition disulfide nanomaterials effective alternatives oxides future applications industrial process control, security, health environmental safety.