Fig. 1.

Conductance measurement of graphene/single-fullerene/graphene junctions. a Schematic of mechanically controlled break junction and graphene/single-fullerene/graphene junction and chemical structure of C₆₀, C₇₀, C₇₆, and C₉₀. b Typical individual conductance–displacement curves for graphene/blank or single-C₆₀, C₇₀, C₇₆, and C₉₀/graphene junctions. c Two-dimensional conductance histogram of single-C₆₀ junction obtained from ~1700 traces, the high trigger was set as 3.2 × 10⁻³ G₀ (G₀ is the quantum conductance that equals 2e²/h.) to avoid the damage of the graphene electrodes. The top right inset is the relative displacement distribution ranging from 3.2 × 10⁻⁴ to 4.0 × 10⁻⁶ G₀. d One-dimensional conductance histogram of graphene/single-C₆₀, C₇₀, C₇₆, C₉₀/graphene junctions and blank experiments. e Conductance of the graphene/single-fullerene/graphene junctions and the highest occupied molecular orbital–lowest unoccupied molecular orbital gap values of fullerenes vs. the number of carbon atoms in fullerenes