Overview of the Recent Advancements in Graphene-Based H₂S Sensors

Abstract

Hydrogen sulfide (H2S) gas detection at room temperature is of immense interest because it reduces power consumption, enhances long-term stability, and reduces the risk of explosion in the existence of flammable gases. Graphene-based gas sensors have been widely utilized in H2S sensing because of their atomically thick two-dimensional conjugated structures, huge specific surface areas, and excellent conductivity and mechanical stability. Usually graphene-based sensors exhibit high sensitivity and selectivity toward H2S gas with limits of detection below 100 ppb. In this critical review, we summarize the history and physicochemical properties of graphene. Further, we discuss recent advancements in the fabrication of graphene-based sensors including metal/graphene, metal oxide/graphene, polymers/graphene, and metal–organic frameworks/graphene sensors for applications in H2S gas sensing. Finally, future perspectives on the improvement of graphene-based H2S sensors are discussed.

Theoretical Investigation of TiSiO4 Monolayer Membranes for Highly Selective H2S Detection from Hazardous Gas Mixtures

“…Some of the gases are hazardous and extremely poisonous to humans, and some other gases are critical as indicators of life and health. − In particular, H 2 S is a common industrial and environmental pollutant with colorless, flammable, and toxic properties that affects human health from a wide range of sources. Even a low concentration of H 2 S can damage the sense of smell in humans. , H 2 S mixed with air in an appropriate proportion will explode, and the combustion will produce toxic SO 2 gas. , Toxic gas hydrogen sulfide can be produced by oil refining, fuel cells, and the coal industry, which is often accompanied by H 2 , CH 4 , CO, SO 2 , and H 2 O gas mixtures . Therefore, it is essential to develop a high-performance device to detect H 2 S gas in a gas mixture.…”

“…Even a low concentration of H 2 S can damage the sense of smell in humans. 6,7 H 2 S mixed with air in an appropriate proportion will explode, and the combustion will produce toxic SO 2 gas. 8,9 Toxic gas hydrogen sulfide can be produced by oil refining, fuel cells, and the coal industry, which is often accompanied by H 2 , CH 4 , CO, SO 2 , and H 2 O gas mixtures.…”

PEGylated Graphene Oxide as a Nanodrug Delivery Vehicle for Podophyllotoxin (GO/PEG/PTOX) and In Vitro α-Amylase/α-Glucosidase Inhibition Activities

“…Nanomaterials based on graphene, like GO, have improved biomedical applications including drug delivery, hydrogel scaffolds, fibers, and so forth . GO provides active surfaces for drug loading through several kinds of interactions such as covalent cross-linking, electrostatic interactions, and physical absorption such as π–π stacking, which are all used to load the drug .…”

“…9 Nanomaterials based on graphene, like GO, have improved biomedical applications including drug delivery, hydrogel scaffolds, fibers, and so forth. 10 GO provides active surfaces for drug loading through several kinds of interactions such as covalent cross-linking, electrostatic interactions, and physical absorption such as π−π stacking, which are all used to load the drug. 11 Usually, the surface of GO is crowded by huge numbers of carboxyl, hydroxyl, or epoxy functionalities that could be exploited for common chemical reactions such as acylation, diazotization, or covalent modification of these functional groups.…”

Quantum Hall effect in graphene transferred by water-soluble transfer sheet and home-use laminator

“…[1][2][3] There have been attempts to apply these materials to devices such as high-speed transistors, flexible devices, transparent electrodes, and sensors based on conductivity changes with molecular adsorption. [4][5][6][7][8] In particular, the carrier mobility that achieves high electrical conductivity is more than 10.0 m 2 V −1 s −1 at RT, 9) which is significantly higher than that of the Si-MOS structures (∼0.1 m 2 V −1 s −1 ). 10) Based on this high mobility, the quantum Hall effect (QHE), a distinguished quantum electric transport phenomenon, was observed at RT.…”