Electron-beam irradiation of photopolymerized C60 film studied using <i>in situ</i> scanning tunneling microscope, <i>in situ</i> Fourier-transform infrared spectroscopy, and first-principles calculations

  • Jun Onoe
    Department of Energy Science and Engineering, Nagoya University 1 , Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
  • Masato Nakaya
    Department of Energy Science and Engineering, Nagoya University 1 , Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
  • Shinta Watanabe
    Department of Energy Science and Engineering, Nagoya University 1 , Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
  • Tomonobu Nakayama
    International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science 2 , 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
  • Kaoru Ohno
    Department of Physics, Yokohama National University 3 , 79-1 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
  • Yusuke Noda
    Department of Energy Science and Engineering, Nagoya University 1 , Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan

抄録

<jats:p>We have examined the formation of a two-dimensional (2D) new carbon network by inducing the general Stone–Wales transformation between adjacent C60 molecules in a 2D dumbbell-type C60 polymer film. Structural changes in pristine C60 films after ultraviolet-visible (UV-vis) light and electron-beam (EB) irradiations were studied using in situ scanning tunneling microscope (STM) and in situ Fourier-transformed infrared (IR) spectroscopy, in combination with first-principles calculations based on density functional theory. Analyses of STM images and depth profiles found that three types of photopolymerized dumbbell-shaped dimers and trimers are formed on the surface layers of pristine C60 films: (i) [2+2] C60 dimers formed in a lateral direction, (ii) [2+2] dimerization of C60 between the first and second layers, and (iii) a triangular [2+2] C60 trimer along a lateral direction. As UV-vis light irradiation time increases, a comparison between experimental and theoretical IR spectra indicated that 2D dumbbell-shaped C60 polymers are formed within a few surface layers of the C60 film (in a similar manner, a 1D dumbbell-shaped polymer is also formed in a shallow space of the C60 film), whereas a [2+2] dumbbell-shaped dimer is formed in any bulk space of the film. Thereafter, when the EB was irradiated to the photopolymerized C60 film, the evolution of IR spectra with respect to EB irradiation time suggested that the 2D dumbbell-type C60 polymer is not decomposed but structurally changed to form a new network polymer.</jats:p>

収録刊行物

  • AIP Advances

    AIP Advances 10 (8), 085212-, 2020-08-01

    AIP Publishing

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