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 °C; ∼0.047 eV); this similarity means that photo-modification did not cause chemical interactions between the fluoropolymer and graphene.

中文翻译：

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含氟聚合物覆盖石墨烯的光分解和掺杂效应的空间分辨化学分析

我们使用空间分辨 X 射线光电发射光谱研究了含氟聚合物覆盖的石墨烯的光分解及其对嵌入石墨烯电性能的影响。从光分解和化学分析的比较方法，我们清楚地证明氟原子通过光子照射从样品表面解吸，导致二氟化物变为单氟化物形式。随着这种光诱导化学改性的进行，偶极场发生强烈变化，这是造成石墨烯层的场驱动狄拉克点重新排列的原因。光改性含氟聚合物的解吸温度与没有光子照射的解吸温度相似（286 °C；~0.047 eV）；