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Highly sensitive two-dimensional MoS2 gas sensor decorated with Pt nanoparticles.

Jaeseo Park1,2, Jihun Mun1, Jae-Soo Shin3

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|January 22, 2019
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Platinum nanoparticle decoration significantly enhances the sensitivity and lowers the detection limits of two-dimensional molybdenum disulfide (MoS2) gas sensors for ammonia (NH3) and hydrogen sulfide (H2S) at room temperature.

Keywords:
Pt nanoparticlesgas sensormolybdenum disulfidetransition metal dichalcogenides

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Sensing

Background:

  • Two-dimensional molybdenum disulfide (MoS2) shows promise for gas sensing applications.
  • Developing highly sensitive and selective gas sensors for ammonia (NH3) and hydrogen sulfide (H2S) is crucial for environmental monitoring and industrial safety.
  • Functionalization strategies are needed to improve the performance of MoS2-based sensors.

Purpose of the Study:

  • To investigate the effect of platinum nanoparticle (Pt NP) decoration on the gas sensing properties of MoS2.
  • To enhance the sensitivity and lower the limit of detection (LOD) for NH3 and H2S gases using Pt NP-decorated MoS2 sensors.
  • To explore the potential of Pt NP-functionalized MoS2 as a high-performance gas sensing material.

Main Methods:

  • Fabrication of a two-dimensional MoS2 film using metal organic gas vapor deposition.
  • Deposition of an interdigitated Au/Ti electrode using electron beam evaporation.
  • Decoration of the MoS2 film with Pt nanoparticles (NPs).
  • Testing the gas sensing performance (sensitivity and LOD) for NH3 and H2S at room temperature.

Main Results:

  • The undecorated MoS2 sensor detected NH3 and H2S at 2.5 ppm and 30 ppm, respectively, at room temperature.
  • Pt NP decoration significantly improved the sensitivity for NH3 by 5.58× and for H2S by 4.25× at 70 ppm.
  • The Pt NP-decorated MoS2 sensor achieved lower LODs of 130 ppb for NH3 and 5 ppm for H2S at room temperature.

Conclusions:

  • Pt NP decoration effectively modulates the electronic properties of MoS2, leading to enhanced gas sensing performance.
  • Pt NP-decorated MoS2-based sensors offer a promising platform for highly sensitive and low-LOD detection of NH3 and H2S.
  • This functionalization strategy presents a viable route for developing advanced gas sensing devices.