We also find that the model explains fairly well the J vs T data for carbon nanotubes, which is reported in a separate paper. The values of thermal expansion coefficient, α and surface density of charge, ns obtained with the use of the model are in excellent agreement with experiments. The model gives us unique method of determination of the Fermi energy of graphene as a function of temperature. The corresponding values obtained for monolayer suspended graphene are: W0 = 4.592 ± 0.002 eV, EF0 = 0.203 ± 0.002 eV ns = 3.16x10¹² cm⁻². It provides a unique technique for accurate determination of work function, W0, Fermi energy, EF0 at 0 K and surface density of charge carriers, ns of graphene. For the first time we have derived an equation for the temperature (T) dependent work function (W(T)) containing terms up to fifth power of T which gives a modified Richardson-Dushman (MRDE) equation that fits excellently well the experimental data of thermionic current density, J vs temperature, T data for suspended monolayer graphene.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |