title: The structural transitions of C60 nanowhiskers under an electric field characterized by in situ transmission electron microscopy and electron energy-loss spectroscopy.
abstract: In situ electrical transport measurements for individual C60 nanowhiskers are performed using a transmission electron microscope which monitors the crystal and electronic structural changes of the C60 nanowhiskers simultaneously. Electron diffraction combined with electron energy-loss spectroscopy shows that under the external electric current, the C60 nanowhiskers first transform from a face-centered-cubic structure to a disordered arrangement of C60 molecules. The cage structure of the C60 molecules then collapses to an amorphous carbon and finally, the amorphous carbon turns into graphene stacks. This process indicates the hybridization transformation from sp(2.278) to sp(2), which is different from the transition process of C60 materials under high pressure. The obtained results also suggest that the stability of the C60 nanowhiskers should be of crucial concern when they work as electrical devices.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, P. R. China. rcyu@aphy.iphy.ac.cn.
authors.forename: Chao
authors.initials: C
authors.lastname: Li
authors.forename: Bingzhe
authors.initials: B
authors.lastname: Wang
authors.forename: Yuan
authors.initials: Y
authors.lastname: Yao
authors.forename: Guangzhe
authors.initials: G
authors.lastname: Piao
authors.forename: Lin
authors.initials: L
authors.lastname: Gu
authors.forename: Yanguo
authors.initials: Y
authors.lastname: Wang
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Duan
authors.forename: Richeng
authors.initials: R
authors.lastname: Yu