Use of fullerene films as surfaces of uniform electric potential

Continuous fullerene films (85% C60, 15% C70) of thickness ∼10 nm have been sublimed on a metallic substrate previously coated with a 1‐nm‐thick Ge sublayer. The films show no surface potential variations when scanned with a Kelvin probe of 1 mV and 1 mm potential and spatial resolutions. Transmission electron microscopy reveals the fullerene films to be amorphous.