Plasmonic Au Nanoparticles Sensitized MoS for Bifunctional NO and Light Sensing

Rahul Kumar, Neeraj Goel, Ramesh Raliya, Govind Gupta, Pratim Biswas, Jun Zhang, Mahesh Kumar

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The possibility to synergise two-dimensional (2D) materials with 0D nanoparticles has sparked a surge in high performance futuristic electronic devices. Here, we decorated plasmonic Au nanoparticles on surface of chemical vapor deposition (CVD) grown 2D MoS2 nanosheet and demonstrated bifunctional sensing behaviour within a single device. The plasmonic Au nanoparticles functionalized MoS2 device showed about 5 times higher sensitivity to NO2 than that of pristine MoS2 at room temperature. The enhanced gas sensing performance was attributed to a combination of Schottky barriers modulation at Au/MoS2 nanointerfaces and catalytic effects upon exposing the gas analyte. In addition, the device also exhibited enhanced photoresponse with a high photo-responsivity of 17.6 A/W and a moderate detectivity of 6.6 × 1011 Jones due to enhanced local plasmonic effects. Finally, photons and gas molecules are detected in sequence, which proved that only a single Au-MoS2 device exhibited remarkable bifunctional sensing characteristics. Such excellent bifunctional sensing ability of a single Au-MoS2 device paves the way to integrate the 2D material with plasmonic nanostructures for developing an advanced multifunctional sensor.

Original languageEnglish (US)
Article number9214957
Pages (from-to)4190-4197
Number of pages8
JournalIEEE Sensors Journal
Volume21
Issue number4
DOIs
StatePublished - Feb 15 2021
Externally publishedYes

Keywords

  • 2D MoS
  • bifunctional sensor
  • CVD
  • gas sensor
  • photodetector

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering

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