The diffusion of silver atoms into C60 solid thin films was observed. The diffusion process was significant at temperatures just above room temperature, with an activation energy of 2.5eV (60kcal/mol). Temperature dependent conductivity measurements indicate that silver atoms form an impurity band in solid C60 with an activation energy of 0.26eV. The ready interdiffusion of silver and C60 may have important implications in the formation of C60/metal contacts or C60/metal layered structures or materials.

Diffusion of Silver in C60 Thin Films. Sarkar, D., Halas, N.J.: Applied Physics Letters, 1993, 63[17], 2438-40