Fabrication of flexible La-MoS <sub>2</sub> hybrid-heterostructure based sensor for NO <sub>2</sub> gas sensing at room temperature
K. S. Rathi, A Naveen Kumar, Kaushik Pal
Abstract
Abstract Transition metal dichalcogenides (TMDs) materials are from the two-dimensional (2D) materials family and have many benefits, comprising high carrier mobility and conductivity, high optical transparency, outstanding mechanical flexibility, and chemical stability, and are also favorable gas sensing materials because of their high surface-area-to-volume ratio. Nevertheless, their low gas-sensing performance in terms of low response, partial recovery, and poor selectivity obstruct the apprehension as high-performance 2D TMDs gas sensing materials. At this time, we explain the enhancement in gas-sensing performance of molybdenum disulfide (MoS 2 ) nanoflakes (NF) by decorating with Lanthanum (La) at room temperature (25 °C). Our experiments show that the dynamic sensing response of the La decorated few-layered MoS 2 (La@MoS 2 ) sensor increases by ∼6 times than the pristine few-layered MoS 2 , which positions it first-ever reported values for NO 2 gas detection. The sensitivity of the MoS 2 and La@MoS 2 found 0.627 and 3.346 ppm −1 , respectively, towards NO 2 gas. It is noteworthy that La has introduced to MoS 2, and its selectivity towards the volatile organic compounds (VOCs) and other toxic gases improved drastically. Our outcomes show that the suggested method represents a successful approach for improving the gas sensing response of 2D TMDs sensors.