Overlaying Monolayer Metal–Organic Framework on PtSe₂‐Based Gas Sensor for Tuning Selectivity

Abstract

Transition metal dichalcogenides (TMDs) have attracted significant interest as gas‐sensing materials due to their unique crystal structure and surface. However, there are still issues when it comes to expanding the types of sensing gases for the TMD gas sensors. To extend gas‐sensing selectivity for the TMD gas sensors in this study, a monolayer (ML) 2D metal–organic framework (MOF) is introduced on top of the PtSe2 gas sensor, thereby tuning the major sensing analyte of PtSe2 from NO2 to H2S. Density functional theory calculations elucidate that the metal species of ML MOFs are attributed to the tuned selectivity of the analytes, based on the difference in binding energies. It is also demonstrated that ML MOF maintained the high responsivity of the pristine PtSe2 even at a low concentration of gas (200 ppb). This is further confirmed through the molecular dynamics simulations, which reveal that the ML feature of the ML MOF is highly essential to preserve the intrinsic ultra‐low limit detection properties of pristine PtSe2.

Fast and direct identification of SARS‐CoV‐2 variants via 2D InSe field‐effect transistors

“…However, the negative factor possessed a unique positive side to biosensing since the carrier transport via trap filling and detrapping behavior exhibited robust and energetic sensitivity to ΔE F caused by NA-induced equivalent gate bias. 46,47 Compared to other strategy for the protection and improvement of the sensor performance like 2D metal-organic framework (MOF), 48 the Al 2 O 3 layer did not actively have the functions to enhance selectivity and sensitivity but effectively modulate the sensing property of 2D InSe channels. And the proposed strategy may free 2D materials from the strict fabrication requirement of perfect surface-states, and provide a scalable research strategy for expanding the functional diversity of 2D bio-FETs.…”

Intrinsic Seebeck coefficients of 2D polycrystalline PtSe2semiconducting films through two-step annealing

“…In recent years, two-dimensional (2D) transition metal dichalcogenides (TMDCs) have emerged as highly promising novel channel materials for high-performance atomically thin transistors. [1][2][3][4] Among representative materials in the group-10 TMDCs, monolayer PtSe 2 has the potential to be utilized in electronics, 5 spintronics, 6 sensors, 7 and thermoelectric devices 8 due to its high carrier mobility at room temperature. 5,9 However, the electrical performance of such devices is largely limited by the lack of feasible methods to form low-resistance electrical contacts with 2D TMDC materials.…”

Expanding Selectivity Functionality of a ZnO Nanotetrapod-Based Volatile Organic Compound Sensor Using Au Nanoparticle Decoration

“…Semiconductor-based gas sensors exhibit poor gas selectivity owing to their relatively open sensing mechanism. − These sensors exhibit selectivity for the target gas, that usually is, the sensor shows a higher response to the target gas than compared gases. − The development of multiselectivity gas sensors by taking advantage of the open sensing property of the semiconductor-based gas sensors has attracted considerable attention. Xu et al synthesized a SnO 2 -based gas sensor and studied its dual-selectivity to CO at 100 °C and CH 4 at 320 °C .…”