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We report on the laser-assisted fabrications of nanostructures in graphene membranes supported on polymer films.By using a laser beam to deposit heat locally,irradiated polymer instantaneously melts and vaporizes.During laser drilling of the polymer,the single-layer graphene membrane adheres to the polymer surface and consequently forms tens of nanometer deep wells.Due to the short time scale of laser irradiation,heat diffusion in the polymer is negligible,and the excitation energy is highly confined in the polymer.As a result,graphene nanowells of hundreds of nanometers in diameter can be patterned with high fidelity.With the increasing of nanowell density,we observe the spontaneous formation of nanowrinkles connecting pairs of nanowells in the graphene membranes.Importantly,Raman spectra confirm that no defects are introduced in graphene membranes by laser irradiation under our experimental conditions.Our results highlight the possibility to construct nanostructures and to design novel devices based on graphene.
We report on the laser-assisted fabrications of nanostructures in graphene membranes supported on polymer films. By using laser beam to deposit heat locally, irradiated polymer instantaneously melts and vaporizes. Driving laser drilling of the polymer, the single-layer graphene membrane adheres to the polymer surface and fabricated forms tens of nanometer deep wells. Due to the short time scale of laser irradiation, heat diffusion in the polymer is negligible, and the excitation energy is highly confined in the polymer. As a result, graphene nanowells of hundreds of nanometers in diameter can be patterned with high fidelity. With the increasing of nanowell density, we observe the spontaneous formation of nanowrinkles connecting pairs of nanowells in the graphene membranes. Implantantly, Raman spectra confirm that no defects are introduced in graphene membranes by laser irradiation under our experimental conditions.Our results highlight the possibility to construct nanostructures and to design nov el devices based on graphene.