Graphene-adsorbate van der Waals bonding memory inspires 'smart' graphene sensors
Published Date: 7/16/2020
Source: phys.org
Monolayer graphene, an atomic-layer thick sheet of carbon, has found immense applications in diverse fields including chemical sensors and detecting single molecule adsorption events electronically. Therefore, monitoring physisorbed molecule induced changes of the electrical response of graphene has become ubiquitous in graphene based sensors. Electric field tuning of the physisorbed molecule-graphene interaction results in enhanced gas sensing due to unique electric field dependent charge-transfer between the adsorbed gas and graphene. Molecular identification in graphene sensors was predicted based on this unique electrically tunable charge-transfer, which is a signature for different adsorbed molecules.