Unusual thermal transport behavior in self-assembled fullerene nanorods
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AbstractIn this work, fullerene (C-60) nanorods were prepared by a surfactant-assisted self-assembly method. Although the orientation of molecular alignment remains unchanged from one end to the other end in these C-60 nanorods, they cannot be rigorously treated as single crystals because of the existence of amorphous-like regions formed by a high density of defects such as stacking faults and vacancy clusters. The partially crystalline and partially amorphous structure results in unusual thermal transport behavior in C-60 nanorods, which cannot be classified into either typical crystalline-like or typical glass-like behavior. The thermal resistances of the C-60 nanorods decrease with increasing temperature and reach a plateau around 100 K, which can be attributed to the combined effect of Einstein localized vibration in C-60 molecules, intracluster vibration, and phonon-defect scattering. Accompanied with depositing Pt/C composites at two ends of a C-60 nanorod to improve thermal contact between Pt electrodes and the C-60 nanorod, tensile strain may be introduced in the C-60 nanorod due to contraction, which enhances thermal resistance, especially in the low temperature range. Ultralow thermal conductivity (less than 0.06 W m(-1) K-1) is observed for self-assembled C-60 nanorods at room temperature, which is significantly lower than the thermal conductivity of bulk C-60 single crystals and polycrystalline C-60/C-70 compacts but on the same order of magnitude as the lower limit of thermal conductivity of amorphous carbon.
All Author(s) ListTang H, Dou KP, Xiong YC, Wang F, Zhao Y, Wang XM, Fu Q, Yang JK, Zhao N, Xu DY
Journal nameRSC Advances
Volume Number72
Issue Number72
Pages67509 - 67513
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesChemistry; Chemistry, Multidisciplinary

Last updated on 2021-21-09 at 23:07