Gate-Modulated High-Response Field-Effect Transistor-Type Gas Sensor Based on the MoS₂/Metal–Organic Framework Heterostructure

Abstract

The high surface-to-volume ratio and decent material properties of two-dimensional (2D) transition metal dichalcogenides (TMDs) make them advantageous as an active channel in field-effect transistor (FET)-type gas sensing devices. However, most existing TMD gas sensors are based on a two-terminal resistance-type structure and suffer from low responsivity and slow response, which has urged materials optimization as well as device engineering. Metal–organic frameworks (MOFs) have a large number of ordered binding sites in the pores that can specifically bind to gas molecules and can be decorated on TMD surfaces to enhance gas sensing capabilities. In this work, we successfully realize the FET-type gas sensor with MoS2-MOF as the channel. The fabricated gas sensor exhibits enhanced NH3 sensing performance (22.475 times higher in responsivity) as compared to the device with a bare MoS2 channel. In addition, the FET-type gas sensor geometry enables effective tuning of sensitivity through electrical gating based on the modulation over the channel carrier concentration. Furthermore, the dependence of responsivity on the MoS2 thickness is investigated as well to achieve an in-depth understanding of the electrical modulation mechanism of the MOF-decorated MoS2 gas sensors. The demonstrated results can pave an attractive pathway toward the realization of advanced high-response and tunable TMD-based gas sensing devices.

Metal–Organic Framework Coated Devices for Gas Sensing

“…155 This drawback requires a good solution before they can be put into practice in a variety of sensing situations. Recently, Zhu et al 156 reported the fabrication of FET sensors based on MoS 2 /MOF heterojunctions to detect NH 3 (Figure 7d). The electrical properties of FDM-23 can be improved by modifying the structure of MoS 2 .…”

“…(d) Schematic diagram of the MoS 2 /MOF FET device. Reproduced with permission 156. Copyright 2022, American Chemical Society.…”

“…(e) Responses of MoS 2 /MOF FET device when exposed to 100 ppm of NH 3 . Reproduced with permission 156. Copyright 2022, American Chemical Society.…”

Photothermal theranostics with glutathione depletion and enhanced reactive oxygen species generation for efficient antibacterial treatment

“…Two-dimensional (2D) Cu 6 (C 8 H 4 O 4 ) 6 (H 2 O) 6 $H 3 [P(W 3 O 10 ) 4 ] (FDM-23) MOF with ultrathin thickness and 2D morphology, was a Cu-based MOF exfoliated from 3D MOF, exhibiting notable electrocatalysis, sensing and separation performance. [29][30][31][32] It is expected that the released copper ions of 2D FDM-23 MOF can trigger GSH elimination, then catalyze Fenton-like reaction, signicantly increasing the CDT effect.…”

Sensitive Detection of a Gaseous Analyte with Low‐Power Metal–Organic Framework Functionalized Carbon Nanotube Transistors

“…The substantial innovation of this work is to provide a universal platform that is based on a high-performance carbon nanotube FET onto which any type of MOF can be grown. There have been a few recent reports where MOFs have been grown on nanowire FETs, organic FETs, MoS 2 -FET, [13][14][15] and on graphene-FETs. [2] But up to now, no work has been reported where MOFs have been grown on CNTFETs.…”