▎ 摘　　要

NOVELTY - Imaging a graphene-based film (450), comprises: providing a graphene-based film on a surface of a medium (401); forming a fluorescent coating over the film to form a sample (403); illuminating the sample with light of a specific wavelength or wavelengths (405), which is absorbed by the coating to cause the coating to emit light of wavelengths longer than that of the absorbed light, which is quenched by the film so that a visibility contrast is formed between the film and the coating; and imaging the film from the visibility contrast. USE - The method is useful for imaging a graphene-based film, and for forming a pattern on a graphene-based film, which is useful in an article of manufacture (all claimed). The method is useful for investigating molecule-graphene interactions at various separations. ADVANTAGE - The method: allows high-throughput, high contrast imaging of graphene-based sheet (GBS) on arbitrary substrate and even in solution; presents itself as a general, low-cost imaging method allowing high-contrast, high-throughput visualization of GBS; is utilized for quick sample check, which so far heavily relies on atomic force microscopy and scanning electron microscope; and provides unexampled imaging capabilities on plastics and in solution. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for forming a pattern on a graphene-based film, comprising: providing a graphene-based film supported by a substrate, where the graphene-based film has graphene oxide (GO) sheets or reduced-GO sheets or graphene sheets; forming a fluorescent photoresist coating over the graphene-based film to form a sample; illuminating the sample with light of a first wavelength or wavelengths along an optical path such that a visibility contrast is formed between the graphene-based film and the fluorescent photoresist coating; imaging the graphene-based film from the visibility contrast to select a desired GO sheet or r-GO sheet or graphene sheet; inserting a photo mask in front of the selected GO sheet or r-GO sheet or graphene sheet along the light path, where the photo mask is formed with many windows that are transparent to optical energy, and the windows is arranged according to a desired pattern; and illuminating the photo mask with light of a second wavelength or wavelengths along the optical path to irradiate the sample by the optical energy passing through the windows of the photo mask to expose the fluorescent photoresist coating and form a pattern corresponding to the desired pattern on the selected GO sheet or r-GO sheet or graphene sheet. DESCRIPTION OF DRAWING(S) - The figure shows a FQM for visualizing graphene-based sheet in a typical FQM experiment. Providing a graphene-based film on a surface of a medium (401) Forming a fluorescent coating over the film to form a sample (403) Illuminating the sample with light of a specific wavelength(s) (405) Imaging a graphene-based film (450)