Tellurene Nanoflake-Based Gas Sensors for the Detection of Decomposition Products of SF₆

Abstract

Tellurene has a phosphorene-like puckered configuration and exhibits great air stability. This characteristic makes it highly sensitive to some gases, and therefore, it has a huge potential in gas sensing applications. In this paper, the sensing performance of tellurene-based gas sensors toward SF6 decomposition products, including H2S, SO2, SO2F2, and SOF2, was systematically investigated. Three types of tellurene-based gas sensors were fabricated: single tellurene flake with ohmic contact (RCTF sensor), single tellurene flake with nonohmic contact (DCTF sensor), and drop-cast tellurene flakes with heat function (HTF sensor). The RCTF sensor exhibited good sensitivity and selectivity toward hydrogen sulfide but slow recovery speed like most two-dimensional materials. The DCTF sensor exhibited a significant improvement in sensitivity, selectivity, and recovery speed compared with the RCTF sensor. Finally, the HTF sensor demonstrated the fastest recovery speed of all tellurene-based sensors. This work showed that the nonohmic contact and heat pulse are easy and efficient methods to enhance the performance of tellurene-based gas sensors toward hydrogen sulfide, which supports the application potential of tellurene in gas sensors.

Research progress and prospects on gas-sensitive mechanisms of semiconductor sensors

“…Apart from 1D nanowires, a large number of 2D nanosheets are usually constructed to explore the microscopic interactions with gas molecules, such as graphene, 77 MXene, 78 phosphorene, 79 tellurene, [80][81][82] arsenene, 83,84 antimonene, 85 and others. Among them, the Ti 3 C 2 T x MXene is a very popular 2D material that selectively etches the specific atoms from the 3D MAX precursors.…”

First-Principles Study on the Selective Detection of Toxic Gases by 2D Monolayer PdS2: Insight into Charge Transfer Dynamics and Alignment of Frontier Molecular Orbitals

“…In this work, we study various toxic gas molecules, including ammonia (NH 3 ), nitrous oxide (N 2 O), NO 2 , nitric oxide (NO), carbon monoxide (CO), hydrogen sulfide (H 2 S), sulfur dioxide (SO 2 ), sulfuryl fluoride (SO 2 F 2 ), and thionyl fluoride (SOF 2 ) (the last four gas molecules are decomposition products of sulfur hexafluoride (SF 6 ) , ), adsorbed on pentagonal PdS 2 monolayer by first-principles calculations. We not only identify the promising applications of monolayer PdS 2 as gas sensor material to NO 2 , NO, and SO 2 but also find that it might be a good criterion for screening suitable sensing materials by comparing the energy of the frontier molecular orbitals of the gas molecules with the band edges of the candidate adsorbent materials.…”

Digital colorimetric sensing for real‐time gas monitoring for smart green energy system

“…Various methods, such as spectroscopy, ultrasound, and particle floating, are being investigated to diagnose and analyze the PD and internal defects of GIS in green energy system. 21,22 However, chemical diagnosis and analysis by decomposition products of SF 6 gas are more common. 23,24 In general, gases generated by PD in the presence of moisture and oxygen in the GIS include CO 2 , CF 4 , SOF 2 , SO 2 F 2 , SOF 4 , S 2 F 10 O, SO 2 , and HF.…”

“…Various methods, such as spectroscopy, ultrasound, and particle floating, are being investigated to diagnose and analyze the PD and internal defects of GIS in green energy system 21,22 . However, chemical diagnosis and analysis by decomposition products of SF 6 gas are more common 23,24 .…”