Hybrid and 2D nanomaterials

Demonstration of a Sensitive and Stable Chemical Gas Sensor Based on Covalently Functionalized MoS2

“…Artificial olfactory systems or electronic noses are capable of detecting and distinguishing volatile organic vapors and, consequently, have potential applications in air quality management, disease diagnosis, and detection of chemical weapons. − In one implementation of an electronic nose, an array of cross-reactive, chemically sensitive resistive sensors can perform vapor detection by mimicking the functionality of biological olfactory systems. ,,− When an analyte, such as an organic vapor, is introduced to the sensor array, the analyte interacts with the sensing material, through permeation, adsorption, or another mechanism, producing a change in the dc electrical resistance of the sensor film. ,, Artificial olfactory chemiresistive sensor arrays have been developed using a variety of materials, such as intrinsically conducting or nonconducting polymers loaded with conducting material (e.g., carbon black or graphene), as well as individually functionalized metal nanoparticles. − ,,− …”

“…Two-dimensional (2-D) materials, such as graphene and transition metal dichalcogenides, have also been considered for chemical sensing applications. ,, MoS 2 has been used for a variety of electronic applications, such as sensors, photovoltaics, and batteries, as well as for gas sensing. − Experimental and computational analyses have indicated that MoS 2 -based sensors have excellent sensitivity, providing detection of a variety of analytes at concentrations lower than 1 ppm, because of favorable electronic interactions coupled with a high surface-area-to-volume ratio. ,,− …”