• 文献标题:   Spatially resolved chemical analysis of photodecomposition and doping effect of fluoropolymer-covered graphene
  • 文献类型:   Article
  • 作  者:   YANG M, IHM K, KIM SY, AHN JR
  • 作者关键词:  
  • 出版物名称:   APPLIED PHYSICS LETTERS
  • ISSN:   0003-6951 EI 1077-3118
  • 通讯作者地址:   Pohang Univ Sci Technol
  • 被引频次:   0
  • DOI:   10.1063/1.5003167
  • 出版年:   2017

▎ 摘  要

We have studied the photo-decomposition of fluoropolymer-covered graphene and its effects on the electrical properties of embedded graphene using spatially resolved X-ray photoemission spectroscopy. From the comparative approach to the photo-decomposition and chemical analysis, we clearly prove that the fluorine atoms are desorbed from the sample surface by photon irradiation, resulting in a change of difluoride into a monofluoride form. As this photo-induced chemical modification proceeds, the dipole field changes strongly, which is responsible for the field-driven Dirac point realignment of the graphene layer. The desorption temperature of the photo-modified fluoropolymer was similar to that without photon irradiation (286 degrees C; similar to 0.047 eV); this similarity means that photo-modification did not cause chemical interactions between the fluoropolymer and graphene.