Selective Chemical Vapor Sensing with Few-Layer MoS2 Thin-Film Transistors

Abstract

We demonstrated selective gas sensing with MoS2 thin-film transistors using the change in the channel conductance, characteristic transient time and low-frequency current fluctuations as the sensing parameters. The back-gated MoS2 thin-film field-effect transistors were fabricated on Si/SiO2 substrates and intentionally aged for a month to verify reliability and achieve better current stability. The same devices with the channel covered by 10 nm of Al2O3 were used as reference samples. The exposure to ethanol, acetonitrile, toluene, chloroform, and methanol vapors results in drastic changes in the source-drain current. The current can increase or decrease by more than two-orders of magnitude depending on the analyte. The reference devices with coated channel did not show any response. It was established that transient time of the current change and the normalized spectral density of the low-frequency current fluctuations can be used as additional sensing parameters for selective gas detection with thin-film MoS2 transistors.

arXiv comment12 pages, 5 figures

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Cited by in corpus (10)

• Asymmetric Schottky Contacts in Bilayer MoS2 Field Effect Transistors
• Gas Sensing with h-BN Capped MoS2 Heterostructure Thin Film Transistors
• Effect of Electron Irradiation on the Transport and Field Emission Properties of Few-Layer MoS2 Field Effect Transistors
• High-Temperature Performance of MoS2 Thin-Film Transistors: DC and Pulse Current-Voltage Characteristics
• Strong thermal transport along polycrystalline transition metal dichalcogenides revealed by multiscale modelling for MoS2
• Understanding the Bias Dependence of Low Frequency Noise in Sin-gle Layer Graphene FETs
• Fluctuation-Enhanced Sensing: Review of Practical Issues
• Bias Dependent Variability of Low Frequency Noise in Single Layer Graphene FETs
• Suppression of 1/f Noise in Near-Ballistic h-BN-Graphene-h-BN Heterostructure Field-Effect Transistors
• Amplitude and Phase Noise of Magnons