Abstract
A two-dimensional molybdenum disulfide (MoS2)-based gas sensor was decorated with Pt nanoparticles (NPs) for high sensitivity and low limit of detection (LOD) for specific gases (NH3 and H2S). The two-dimensional MoS2 film was grown at 400°C using metal organic gas vapour deposition. To fabricate the MoS2 gas sensor, an interdigitated Au/Ti electrode was deposited using the electron beam (e-beam) evaporation method with a stencil mask. The MoS2 gas sensor without metal decoration sensitively detects NH3 and H2S gas down to 2.5 and 30 ppm, respectively, at room temperature (RT). However, for improved detection of NH3 and H2S gas, we investigated the functionalization strategy using metal decoration. Pt NP decoration modulated the electronic properties of MoS2, significantly improving the sensitivity of NH3 and H2S gas by 5.58× and 4.25×, respectively, compared with the undecorated MoS2 gas sensor under concentrations of 70 ppm. Furthermore, the Pt NP-decorated MoS2 sensor had lower LODs for NH3 and H2S gas of 130 ppb and 5 ppm, respectively, at RT.
Highlights
Metal oxide-based gas sensors possess many merits, such as relatively high sensitivity and low cost, which has garnered much attention to the material [1]
A two-dimensional molybdenum disulfide (MoS2)-based gas sensor was decorated with Pt nanoparticles (NPs) for high sensitivity and low limit of detection (LOD) for specific gases (NH3 and H2S)
Pt NPs were decorated on Metal organic chemical vapour deposition (MOCVD) two-dimensional MoS2 to obtain high sensitivity and low LOD for NH3 and H2S gases
Summary
Metal oxide-based gas sensors possess many merits, such as relatively high sensitivity and low cost, which has garnered much attention to the material [1]. To obtain such gas-sensing properties for a specific gas, these gas sensors generally suffer from several issues, such as thermal instability and high power consumption, due to poor performance at low operating temperatures [1]. Functionalization [23,24,25,26,27,28,29,30,31,32] using metal decoration [23,24,25,26,27,28,29,30] on two-dimensional materials can open an avenue for gas detection [23,24,25,26,27,28,29,30,31,32]
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