Electrospray Printing of Graphene Layers for Chemiresistive Gas Sensors

Abstract

In this work we investigate the electrospray technique for the preparation of graphene layers for use in chemiresistive gas sensors. A dispersion of reduced graphene oxide (rGO) in isopropanol (0.1 mg/mL) is electrosprayed and the rGO flakes are deposited onto a polymeric substrate with printed interdigitated electrodes. The surface area of the substrate covered with rGO is mainly determined by the distance between the needle and the substrate, while the rGO deposition pattern strongly depends on the flowrate and the applied voltage. Homogeneous layers of rGO are obtained in stable cone-jet regime, and the room temperature detection behavior of the sensors towards NO2, O3 and CO is assessed. The sensors were not capable of detecting CO (up to 5 ppm), but they detected 0.2 ppm NO2 and 0.05 ppm O3. The results are encouraging regarding the use of electrospray for production of low-cost and low-power consumption gas sensors based on graphene for air quality applications.

The status and perspectives of nanostructured materials and fabrication processes for wearable piezoresistive sensors

“…Recently, Masa et al ( 2020 ) investigate the electrospray technique for the preparation of graphene layers for use in chemiresistive gas sensors. They dispersed reduced graphene oxide (rGO) in isopropyl alcohol (0.1 mg/mL) that was electrosprayed and the rGO flakes are deposited onto a polymeric substrate with printed interdigitated electrodes.…”

Automation and optimization device for the fabrication of sensors with nanomaterials

“…Two types of micromachined silicon substrates (microhotplates) were developed by CNM (National Microelectronics Centre, Barcelona) [4] and LAAS (Laboratory for Analysis and Architecture of Systems, Toulouse) [5] are used. These devices are assembled in a TO-8 package, with 12 and 16 pins, respectively.…”