C-60 and higher fullerenes are efficiently produced by the J x B gas-are method. From the produced Soot, C-60, C-70 and C-84 are extracted and purified by the liquid chromatography method. C-60, C-70 and C-84 thin films with a thickness of 1-4 mu m are produced by the vacuum sublimation method, and their dielectric properties are investigated. Both the real and imaginary parts of the dielectric constants of C-60, C-70 and C-84 are very high at a low frequency (f = 120 Hz) and they monotonically decrease with time when the films are exposed to air. After sufficient absorption of oxygen, these dielectric constants become almost the same. (c) 2005 Elsevier B.V. All rights reserved.