Chemically Exfoliated Layered Materials for Practical Gas Sensing Applications

In the last decade two-dimensional materials have attracted great interest for a wide range of applications, from optoelectronics to nanobiotechnology. Between the possible applications, the use of two-dimensional materials for the production of gas sensors has proved to be very promising. In this work we report on the fabrication and the characterization of gas sensors obtained from chemically exfoliated graphene oxide, black phosphorous, MoS2 and WS2. All the sensors were prepared by simply drop casting the flakes dispersed in a solution on a Pt interdigitated substrate. The sensors have shown excellent electrical responses to both oxidizing and reducing gases, demonstrating that the use of chemically exfoliated two-dimensional materials is a practical and cheap way to produce high-quality gas sensing devices.