PdO and PtO loaded WS2 boosts NO2 gas sensing characteristics at room temperature

In this work tungsten disulphide nanostructures loaded with platinum-oxide (PtO), or palladium-oxide (PdO) were grown directly onto alumina substrates. This was achieved using a combination of aerosol-assisted chemical vapour deposition (AA-CVD) method atmospheric pressure CVD technique. At first, oxide nanowires either PtO PdO nanoparticles successfully co-deposited via AA-CVD followed by sulfurization at 900 °C in the next step. The morphological, structural, and characteristics investigated FESEM, TEM, XRD, XPS Raman spectroscopy. results confirm presence WS2 host matrix. Gas sensing attributes pristine sensors investigated, room temperature, towards different analytes (NO2, NH3, H2 etc.). Both metal-oxide gas show remarkable responses temperature NO2 detection. Further, demonstrated stable, reproducible, ultrasensitive, enhanced response, detection limit below 25 ppb. Additionally, effect ambient humidity on response both for gas. sensor considerably decreased humid environments, while increased. However, slightly heating (at 100 °C) sensors, suppresses influence humidity. Finally, long-term stability is demonstrate high repeatable after 6 weeks tests. exploits an attractive pathway to add functionality transition metal dichalcogenide