Gas sensing in 2D materials

TLDR

Two‑dimensional layered inorganic nanomaterials possess unique electronic structures and extraordinary properties that make them attractive for electronics, optoelectronics, spintronics, catalysis, energy storage, and chemical sensing, with graphene and related analogues offering large surface areas and strong surface activities for gas‑sensing applications. This review discusses the latest advancements in 2D layered inorganic materials for gas sensors. The review elaborates gas‑sensing mechanisms, device types, key parameters, and influence factors, and systematically presents applications of graphene, GO, rGO, transition metal dichalcogenides, III‑VI semiconductors, metal oxides, phosphorene, and hexagonal boron nitride. The authors conclude that layered inorganic materials hold promising future prospects for gas‑sensing applications.

Abstract

Two-dimensional (2D) layered inorganic nanomaterials have attracted huge attention due to their unique electronic structures, as well as extraordinary physical and chemical properties for use in electronics, optoelectronics, spintronics, catalysts, energy generation and storage, and chemical sensors. Graphene and related layered inorganic analogues have shown great potential for gas-sensing applications because of their large specific surface areas and strong surface activities. This review aims to discuss the latest advancements in the 2D layered inorganic materials for gas sensors. We first elaborate the gas-sensing mechanisms and introduce various types of gas-sensing devices. Then, we describe the basic parameters and influence factors of the gas sensors to further enhance their performance. Moreover, we systematically present the current gas-sensing applications based on graphene, graphene oxide (GO), reduced graphene oxide (rGO), functionalized GO or rGO, transition metal dichalcogenides, layered III-VI semiconductors, layered metal oxides, phosphorene, hexagonal boron nitride, etc. Finally, we conclude the future prospects of these layered inorganic materials in gas-sensing applications.