Highly sensitive two-dimensional MoS ₂ gas sensor decorated with Pt nanoparticles

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.

Morphological Characteristics of Molybdenum Disulfide and Current Application on Detecting SF6 Decomposing Products

“…Park et al prepared a MoS 2 gas sensor modified with Pt nanoparticles with a low detection limit and high sensitivity for H 2 S gas. The Pt-MoS 2 -based sensor reduced the minimum detection concentration of H 2 S gas to 5 ppm, which was much lower than that of the pure MoS 2 sensor (30 ppm) (Park et al, 2018). The Pt-MoS 2 film structures were formed by the introduction of Pt nanoparticles with ultra-small diameters, which could distinctly improve the performance of sensors.…”

Chemical Gas Sensors: Recent Developments, Challenges, and the Potential of Machine Learning—A Review

“…For instance, the sensors made of pure MoS 2 showed little response towards different gases but were not able to display full recovery and good selectivity [106]. Park et al [107] reported enhanced NH 3 and H 2 S detection using Pt NPs decorated on MoS 2 -synthesized via vapor deposition technique. Their sensor revealed relatively better performance than that of pure MoS 2 sensors but still did not achieve full recovery to the baseline (see Figure 7A).…”

2D Materials Based Optoelectronic Memory: Convergence of Electronic Memory and Optical Sensor

“…More specifically, 2D materials (TMDs, BP, silicene, MXene, etc.) are adopted as promising candidates for high-sensitive gas sensors because of the large surface-to-volume ratio and tunable functionality of the surface through decorating transition metals or functional groups [65][66][67][68][69]. The excellent mechanical properties and piezoelectric properties in 2D materials also implicate the applications of sound detectors [70][71][72].…”