Structural and Thermodynamic Properties of Fullerene Nanowhiskers

Abstract

The motion of C60 molecules in fullerene nanowhiskers (C60NWs) has been investigated by means of low-temperature X-ray diffraction, magnetic susceptibility, specific heat, and 13C NMR (nuclear magnetic resonance). The temperature dependence of the lattice constant for C60NWs is in good agreement with that for the pristine C60 powder, which demonstrates a large discontinuity at Tthe temperature dependence of magnetic susceptibility for C60NWs exhibits a faint anomaly at Tspecific heat for C60NWs shows two small anomalies at 232 and 254 K. High-resolution 13C NMR measurements of the C60NWs indicate that both toluene and 2-propanol molecules interact with the C60NW molecules in the suspension and the precipitate states obtained by using the liquid-liquid interfacial precipitation method. The broader linewidth of 13C NMR in the dried C60NWs compared with that in the pristine C60 powder indicates slower molecular Fullerene Nanowhiskers Edited by Kun’ichi Miyazawa Copyright © 2012 Pan Stanford Publishing Pte. Ltd. www.panstanford.comreorientation in the dried C60NWs compared with that in the pristine C60 powder. Since a rapid rotation of C60 molecules could be directly detected by 13C NMR, polymer formation between C60 molecules is unlikely in C60NWs at room temperature.