Patent ID: 9183971
Filing Date: 2015-11-10
Classification: C01B,H01B,H01L,Y02E

Abstract:
1. A method for controllable layer-by-layer removal of graphene layers, comprising the steps of: providing a plurality of graphene layers; providing a highly graphene-oxidizing agent in a hermetic environment; providing a heating source for heating the plurality of graphene layers; and providing a power adjustable laser for defining a pre-determined pattern on the plurality graphene layers, wherein defining the pre-determined pattern on the plurality of graphene layers includes steps of removing the plurality of graphene layers layer-by-layer by the power adjustable laser according to the pre-determined pattern, and the steps include: determining a targeted number of graphene layers to be removed according to the pre-determined pattern; partially removing portions of the plurality of graphene layers according to the pre-determined pattern by the power adjustable laser; then determining a number of graphene layers remained; obtaining a number of graphene layers removed by calculating the difference between a total number of graphene layers and the number of graphene layers remained through a feedback loop controller; calculating the difference between the number of graphene layers removed and the targeted number of graphene layers to be removed to determine a number of graphene layers to be further removed through the feedback loop controller; adjusting the power of the power adjustable laser according to the number of graphene layers to be further removed through the feedback loop controller; and repeating the steps until all of the targeted number of graphene layers are removed.