Ultrasensitive reversible oxygen sensing by using liquid-exfoliated MoS₂ nanoparticles

Abstract

Two-dimensional (2D) molybdenum disulfide (MoS2) has been attracting rapidly increasing interest for application in chemoresistive gas sensors owing to its moderate band gap energy and high specific surface area.

Thin 2D: The New Dimensionality in Gas Sensing

“…It has been demonstrated that changes in interlayer coupling, the degree of quantum confinement, and symmetry elements lead to dramatic differences in the electronic structure of single-layer materials, i.e., increases at the valence band edge with respect to the bulk material [22]. The electronic structure of single-layer material is furthermore strongly influenced by adsorbed species.…”

“…Furthermore, by examining the electronic structures of such thin 2D materials, such as the density of states (DOS), important information can be acquired which is essential to understand their intrinsic charge transporting characteristics. It has been demonstrated that changes in interlayer coupling, the degree of quantum confinement, and symmetry elements lead to dramatic differences in the electronic structure of single-layer materials, i.e., increases at the valence band edge with respect to the bulk material [22]. The electronic structure of single-layer material is furthermore strongly influenced by adsorbed species.…”

“…The drain current of the FET (Field Effect Transistor) device decreased in O2 and air, but increased in ethanol and NH3, compared to that under MoS 2 has demonstrated excellent sensing characteristics such as high sensitivity, fast response time, and good stability to a series of target gases [50][51][52][53][54][55][56]. For example, Kim et al investigated the oxygen sensing behavior of MoS 2 microflakes prepared by mechanical and liquid exfoliation, respectively [22]. The sensors show huge differences in sensing properties according to their fabrication methods.…”

“…For example, Kim et al investigated the oxygen sensing behavior of MoS2 microflakes prepared by mechanical and liquid exfoliation, respectively [22]. The sensors show huge differences in sensing properties according to their fabrication methods.…”

Design of Metal Oxide Hollow Structures Using Soft-templating Method for High-Performance Gas Sensors

“…Various gas sensors including optical, electrochemical, surface acoustic wave, and semiconductor metal oxide sensors have been extensively studied to fulfill the needs of the IoT [9]. In particular, owing to their simplicity in operation, low cost, flexibility in production, small size, and easy integration with electronic circuits, semiconductor gas sensors based on metal oxides are very promising as sensing elements for IoT [10][11][12].…”