Single CO2 molecule detection using graphene-based nanoscale sensor devices
Hiroshi MIZUTA1,2, Jian SUN3, Manoharan MURUGANATHAN1
The impact of CO2 molecules physisorbed onto graphene was investigated experimentally and theoretically with the goal of single molecular detection. The electrical tunability of charge transfer via an external electric field was elucidated for the graphene-CO2 molecule van der Waals (vdW) complex. By employing a unique graphene nano-electro-mechanical (NEM) device architecture, the adsorption and desorption of individual CO2 molecules were observed successfully as quantized variations of electrical resistance at room temperature. By conducting a vdW Density Functional simulation, it was revealed that the Coulomb potential caused by an adsorbed CO2 molecule disturbs carrier conduction in the graphene channel, resulting in a detectable resistance variation. Fast detection within only a few minutes was achieved by accelerating the molecular adsorption by applying an electric field from the substrate.
- 1 Japan Advanced Institute of Science and Technology
- 2 Hitachi Cambridge Laboratory, Hitachi Europe Ltd
- 3 RIKEN