• 文献标题:   All-Optical and One-Color Rewritable Chemical Patterning on Pristine Graphene under Water
  • 文献类型:   Article
  • 作  者:   TOYOUCHI S, WOLF M, FENG GL, FUJITA Y, FORTUNI B, INOSE T, HIRAI K, DE FEYTER S, UJII H
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF PHYSICAL CHEMISTRY LETTERS
  • ISSN:   1948-7185
  • 通讯作者地址:  
  • 被引频次:   3
  • DOI:   10.1021/acs.jpclett.2c00446
  • 出版年:   2022

▎ 摘  要

We report a facile all-optical method for spatially resolved and reversible chemical modification of a graphene monolayer. A tightly focused laser on graphene under water introduces an sp(3)-type chemical defect by photo-oxidation. The spa-type defects can be reversibly restored to sp(2) carbon centers by the same laser with higher intensity. The photoreduction occurs due to laser-induced local heating on the graphene. These optical methods combined with a laser direct writing technique allow photowriting and erasing of a well-defined chemical pattern on a graphene canvas with a spatial resolution of about 300 nm. The pattern is visualized by Raman mapping with the same excitation laser, enabling an optical read-out of the chemical information on the graphene. Here, we successfully demonstrate all-optical Write/Read-out/Erase of chemical functionalization patterns on graphene by simply adjusting the one-color laser intensity. The all-optical method enables flexible and efficient tailoring of physicochemical properties in nanoscale for future applications.