▎ 摘　　要

We evaluate separation dependent van der Waals dispersion (C-3) coefficients for the interactions of the Li, Na, K and Rb atoms with a graphene layer and with a single walled carbon nanotube (CNT) using the hydrodynamic and Dirac models. The results from both the models are evaluated using accurate values of the dynamic polarizabilities of the above alkali atoms. Accountability of accurate dynamic polarizabilities of the alkali atoms to determine the C-3 coefficients are accentuated by comparing the obtained coefficients using the precise values of the dynamic dipole polarizabilities against the values estimated from the single oscillator approximation that are generally used in the earlier calculations. For a practical description of the atom-surface interaction potentials, the C-3 coefficients are given for a wide range of separation distances between the considered ground states of the atoms and the wall surfaces and also for different nanotube radii. The coefficients for the graphene layer are fitted to a logistic function of the separation distance. For CNT, we find a paraboloid kind of fit dependence both on the separation distances and radii of the CNT.