Photovoltaic induced self-powered gas sensor based on 2D MoS2 incorporated NbSe2 nanorods heterostructure for NH3 gas sensing at room temperature

Adhimoorthy Saravanan, Bohr Ran Huang, Seung Kyu Hwang, Deepa Kathiravan, Wesley Wei-Wen Hsiao, Ravichandran Jayachitra, Abebaw Abun, Po Da Hong, Ali Mohammadi, A. T.Ezhil Vilian, Young Kyu Han, Yun Suk Huh

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Two-dimensional (2D) transition metal dichalcogenides (TMDs) have attracted significant attention for their optical and gas-sensing applications due to their exceptional sensitivity. Reliable selectivity and low power consumption are two major requirements for photodetector and gas sensor applications in next-generation electronic devices and the Internet of Things. Self-powered sensors (especially photovoltaic gas sensors) can solve these problems. In this study, for the first time, we report 2D TMDs (NbSe2-MoS2 hybrid) on a SiO2/Si substrate to fabricate photovoltaic self-powered gas sensors. The gas sensors are operated by the photovoltaic effect of the NbSe2-MoS2 nanostructure, which is prepared using the liquid phase exfoliation process. Initially, it was revealed that the present hybrid material exhibits photovoltaic properties under light illumination, with a circuit current of 0.25 µA and a circuit voltage of 34 mV. The NbSe2-MoS2 nanostructure characteristics were then used for NH3 gas sensing at different concentrations, and the gas sensing response was detected from low (8.8 % at 10 ppm) to high (28.8 % at 500 ppm) concentrations. The built-in electric field occurred between the NbSe2-MoS2 junction and eventually operated as a driving force for NbSe2-MoS2 gas sensing without an external bias voltage. The physisorption of gas molecules on their surface prompts a charge-transfer mechanism that improves the gas sensor response. The combined outcome of NbSe2-MoS2 heterostructures could pave way to next-generation gas sensing device fabrications.

Original languageEnglish
Article number151795
JournalChemical Engineering Journal
Volume491
DOIs
StatePublished - 1 Jul 2024

Keywords

  • NbSe-MoS hybrid
  • Niobium diselenide-molybdenum disulphide
  • Photovoltaic gas sensors
  • Self-powered gas sensor
  • Two-dimensional nanostructure

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