▎ 摘　　要

The paper presents data on the graphene work function vs. its thickness on Re(10 (1) over bar0) in ultra-high vacuum. Methods are used allowing one to get thermodynamically correct work function value: Richardson method and surface thermal ionization of non-readily ionizable probing atoms (Na). It has been shown that both graphene monolayer and polylayer films are uniform in work function with the accuracy of similar to 0.05 eV. The graphene work function grows from e phi = 4.30 +/- 0.05 eV for a monolayer up to 4.70 +/- 0.05 eV with the thickness and is stabilized for a >= 10 layers. This differs strongly from the data for chemisorbed carbon where e phi is stabilized at 1-1.5 monolayers. Reasons for such unusual behavior have been discussed. The above data agrees well with previously observed light transparency of thin graphene film on various metals.