▎ 摘　　要

In this paper, the adsorption of lactate molecules is studied on the two-dimensional structure of graphene and psi-graphene. First-principle calculations based on density functional theory showed that the absorption energy of the lactate molecule on psi-graphene is much higher than that of graphene. The monolayer of graphene and psi-graphene is conductive after the adsorption of lactate molecules. Furthermore, the I-V characteristics based on the non-equilibrium Green's function explain that negative differential resistance occurs in 0.75 V for the absorption of lactate molecules. Based on our findings, AGNR and Z psi GNR can be used as the detection of lactate molecule, and psi-graphene is used as an absorbent of this molecule from the environment.