Science Daily January 30, 2019
Water molecules change the electrical resistance of this carbon material, which introduces a false signal into the sensor. An international team of researchers (Sweden, Germany) discovered that when this two-dimensional material is integrated with the metal of a circuit, contact resistance is not impaired by humidity. They used graphene together with gold metallization and silica substrates in transmission line model test structures, as well as computer simulations to demonstrate their discovery. As part of the European CO2-DETECT project, they are applying this new approach to create the first prototypes of graphene-based sensors to measure carbon dioxide by means of optical detection of mid-infrared light and at lower costs than with other technologies… read more. Open Access TECHNICAL ARTICLE
Schematic of a graphene device with a contact resistance that is not altered by the water molecules adsorbed on its surface. Credit: Anderson D. Smith