The lengths and diameters of C-60 nanowhiskers (C(60)NWs) grown in solutions were investigated relative to the inner diameter of the glass bottle and the solution volume while maintaining the volumetric ratio of C-60-saturated toluene and isopropyl alcohol at 1:1. The mean lengths and diameters of the C(60)NWs increased, and the distribution of the lengths and diameters broadened when increasing the solution volume. The mean crystal nucleus size of the C(60)NWs was determined by analyzing the size dependence of C(60)NWs on the solution volume. The lengths and diameters of C(60)NWs asymptotically approach their upper limits when increasing the solution volume. (C) 2014 Elsevier B.V. All rights reserved.