The Combination of Two-Dimensional Nanomaterials with Metal Oxide Nanoparticles for Gas Sensors: A Review

Abstract

Metal oxide nanoparticles have been widely utilized for the fabrication of functional gas sensors to determine various flammable, explosive, toxic, and harmful gases due to their advantages of low cost, fast response, and high sensitivity. However, metal oxide-based gas sensors reveal the shortcomings of high operating temperature, high power requirement, and low selectivity, which limited their rapid development in the fabrication of high-performance gas sensors. The combination of metal oxides with two-dimensional (2D) nanomaterials to construct a heterostructure can hybridize the advantages of each other and overcome their respective shortcomings, thereby improving the sensing performance of the fabricated gas sensors. In this review, we present recent advances in the fabrication of metal oxide-, 2D nanomaterials-, as well as 2D material/metal oxide composite-based gas sensors with highly sensitive and selective functions. To achieve this aim, we firstly introduce the working principles of various gas sensors, and then discuss the factors that could affect the sensitivity of gas sensors. After that, a lot of cases on the fabrication of gas sensors by using metal oxides, 2D materials, and 2D material/metal oxide composites are demonstrated. Finally, we summarize the current development and discuss potential research directions in this promising topic. We believe in this work is helpful for the readers in multidiscipline research fields like materials science, nanotechnology, chemical engineering, environmental science, and other related aspects.

Investigation of nanosized alumina‐binder feedstock rheology for ceramics injection molding (CIM) and survey spark plasma sintering of output green body to obtain transparent alumina

“…reported an alumina wear rate with the grain size of 450 nm, 750 nm, and 4 μm as 1.0 × 10 −7 , 4–4.5 × 10 −7 , and 6–6.5 × 10 −7 mm 3 /N m, respectively. Thus, the amount of wear for the grain size of the alumina sintered in the present research (1–4 μm) seems to be logical 32–43 …”

“…Thus, the amount of wear for the grain size of the alumina sintered in the present research (1-4 μm) seems to be logical. [32][33][34][35][36][37][38][39][40][41][42][43]…”

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“…Nowadays metal oxide nanoparticles are enormously used in different applications such electronics, [15] cosmetics, [16] catalysis, [17] storage devices, [18] drug delivery, [19] medicine, [20] and biomedical. [21] Transition metal based metallic oxide has become the emerging class and gained much attention of scientist and researchers.…”