A novel solid-liquid two-phase precipitation (SLTPP) method, utilising a solidified (via liquid N2) m-xylene solution of C60 with liquid isopropanol (IPA) as the counter-solvent, is proposed for the synthesis of fullerene (C60) nanowires. The resulting C60 nanowires were observed to possess high crystallinity, a length-to-diameter ratio of up to several thousand with a diameter as small as ~ 85 nm. We further systematically investigated the effects of C60 concentration (1 − 5.2 mg/ml) and solvent − counter-solvent ratio (1:6 − 2:1) to optimise the growth conditions for high-quality, size-controlled C60 nanowires. A comparative study against the widely-used liquid-liquid interfacial precipitation (LLIP) method showed that the proposed SLTPP method led to a much narrower diameter distribution (414.20 ± 92.10 nm vs. 3237.20 ± 1790.30 nm for LLIP) across the studied range of C60 concentration and solvent − counter …