Gate-controlled gas sensor utilizing 1D–2D hybrid nanowires network

Abstract

Summary Novel gas sensors that work at room temperature are attracting attention due to their low energy consumption and stability in the presence of toxic gases. However, the development of sensing characteristics at room temperature is still a primary challenge. Diverse reaction pathways and low adsorption energy for gas molecules are required to fabricate a gas sensor that works at room temperature with high sensitivity, selectivity, and efficiency. Therefore, we enhanced the gas sensing performance at room temperature by constructing hybridized nanostructure of 1D–2D hybrid of SnSe 2 layers and SnO 2 nanowire networks and by controlling the back-gate bias (V g = 1.5 V). The response time was dramatically reduced by lowering the energy barrier for the adsorption on the reactive sites, which are controlled by the back gate. Consequently, we believe that this research could contribute to improving the performance of gas sensors that work at room temperature.

Controllable Oxygen‐Incorporated 2D‐SnSe2 Layered Thin Film by Plasma‐Assisted Selenization Process with Enhanced NO2 Gas Sensitivity and Improved Humidity Stability

“…In recent years, several ways of constructing SnO 2 /SnSe 2 heterostructures have been reported, such as partial oxidation of pristine SnSe 2 [ 17 ] and surface selenization of SnO 2 nanowires. [ 19 ] Additionally, the long‐term stability of hybrid SnO 2 /SnSe 2 has been confirmed theoretically and practically. However, there are still several issues that require further discussion and attention.…”

“…To further enhance the gas sensing performance, constructing heterostructures in the SnSe 2 layered film, a new phase of SnO 2 has been confirmed to be an effective approach. [17][18][19] Considering NO 2 detection, studies have shown that an electron accumulation layer would form on the SnO 2 side close to the SnSe 2 /SnO 2 interface, trapping more adsorbed oxygen. During the NO 2 detection, the NO 2 molecules would interact with the adsorbed oxygen, which takes away more electrons and significantly enhances the response.…”

Mixed-dimensional van der Waals heterostructure enabled gas sensors: fundamentals and applications

“…From this view, Seo et al fabricated an FET sensor using a 1D/2D hybrid nanowire network of SnO 2 /SnSe 2 and examined gas sensing behavior after applying different gate voltages. 85 The 2D SnSe 2 layer over the SnO 2 nanowire was synthesized by converting the shallow layer of SnO 2 into SnSe 2 using the CVD process (Fig. 11(g)).…”