Fabrication of Flexible MoS₂ Thin‐Film Transistor Arrays for Practical Gas‐Sensing Applications

TLDR

The flexible transistor array serves as a highly sensitive, reproducible gas sensor. The array is fabricated by integrating solution‑processable MoS₂ as the active channel with reduced graphene oxide electrodes, using a simple 1.5‑mm channel design that ensures reproducible device operation. The MoS₂‑based sensor shows markedly higher sensitivity than rGO alone, and Pt nanoparticle functionalization boosts sensitivity by up to threefold, indicating its promise for diverse electronic applications.

Abstract

Abstract By combining two kinds of solution‐processable two‐dimensional materials, a flexible transistor array is fabricated in which MoS 2 thin film is used as the active channel and reduced graphene oxide (rGO) film is used as the drain and source electrodes. The simple device configuration and the 1.5 mm‐long MoS 2 channel ensure highly reproducible device fabrication and operation. This flexible transistor array can be used as a highly sensitive gas sensor with excellent reproducibility. Compared to using rGO thin film as the active channel, this new gas sensor exhibits much higher sensitivity. Moreover, functionalization of the MoS 2 thin film with Pt nanoparticles further increases the sensitivity by up to ∼3 times. The successful incorporation of a MoS 2 thin‐film into the electronic sensor promises its potential application in various electronic devices.