Low Working Temperature of ZnO-MoS2 Nanocomposites for Delaying Aging with Good Acetylene Gas-Sensing Properties

Abstract

The long-term stability and the extension of the use time of gas sensors are one of the current concerns. Lowering the working temperature is one of the most effective methods to delay aging. In this paper, pure MoS2 and ZnO-MoS2 nanocomposites were successfully prepared by the hydrothermal method, and the morphological characteristics were featured by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Pure MoS2 and ZnO-MoS2 nanocomposites, as a comparison, were used to study the aging characteristic. The sensing properties of the fabricated gas sensors with an optimal molar ratio ZnO-MoS2 (Zn:Mo = 1:2) were recorded, and the results exhibit a high gas-sensing response and good repeatability to the acetylene detection. The working temperature was significantly lower than for pure MoS2. After aging for 40 days, all the gas-sensing response was relatively attenuated, and pure MoS2 exhibits a faster decay rate and lower gas-sensing response than nanocomposites. The better gas-sensing characteristic of nanocomposites after aging was possibly attributed to the active interaction between ZnO and MoS2.

Ppb-Level Hydrogen Sulfide Gas Sensor Based on the Nanocomposite of MoS2 Octahedron/ZnO-Zn2SnO4 Nanoparticles

“…For instance, various 2D materials and metal oxide-based gas sensors such as MoS 2 -reduced graphene oxide nanohybrid, MoS 2 @MoO 3 magnetic hetero-structure, wool-based carbon fiber/MoS 2 composite and ZnO-MoS 2 nanocomposites were used to detect various types of VOCs, accompanied by high response, good selectivity, rapid response/recovery times, etc. [ 28 , 29 , 30 , 31 ].…”

Room-Temperature Ammonia Detection Using Layered Bi2Se3/Bi2O3: A Next-Generation Sensor

“…Moreover, NH 3 exposure of more than 50 parts per million (ppm) can cause severe health-related issues as per United States health organization . Recently, layered metal dichalcogenides like MoS 2 , MoSe 2 , MoTe 2 , SnS 2 , WS 2 , and WSe 2 have emerged as new alternatives for NH 3 sensing owing to their extraordinary properties like high surface-to-volume ratio, catalytic property, ease of fabricating flexible wearable sensor, etc. − However, the response of these layered material-based sensors is not adequate at room temperature and needs several strategies to improve the sensing performance, e.g., noble metal doping (such as Pt and Au), functionalization, composites with other materials, etc. − Besides inventing new strategies to improve the sensing performance of the existing materials, it is also very much essential to introduce new functional materials for gas sensing, which may exhibit superior sensing performance. Bi 2 Se 3 is a metal chalcogenide (bandgap 0.3 eV) with a layered structure, where individual layers are stacked via a weak van der Waals interaction .…”

Two-Step Facile Preparation of 2D MoS2/ZnO Nanocomposite p - n Junctions with Enhanced Photoelectric Performance

“…Previous experiments already demonstrated that multilayer MoS 2 -ZnO heteronanostructures could effectively increase the spectral absorption range and promote the separation and migration of carriers through the built-in electric fields, thereby improving the photoelectric response characteristics [14]. Several hybrid MoS 2 -ZnO nanomaterial-based prototypes such as flexible photodetectors and gas sensors have also been reported [26,27]. Based on this point, it is necessary to further study new heteronanostructures and heterojunctions in the MoS 2 /ZnO that may have new valuable applications in solar cells and self-powered photodetectors.…”