Method for patterning a piece of carbon nanomaterial and a processed piece of carbon nanomaterial

A method for patterning a piece of carbon nanomaterial, wherein

• the piece of carbon nanomaterial (i) has a length, a width, and a thickness or (ii) is obtainable, e.g. by bending or rolling, from a sample of carbon nanomaterial having a length, a width, and a thickness, wherein
• the length is greater than or equal to the thickness, the width is greater than or equal to the thickness, and the thickness is at most 50 nm,
• the carbon nanomaterial comprises (i) a monolayer of graphene or (ii) multilayer graphene comprising a number of graphene monolayers, wherein the number is at most 30
• the piece of carbon nanomaterial comprises a region, in which the molar ratio of oxygen to carbon has a base value that is equal to or greater than zero,
• the region of the piece of carbon nanomaterial comprises at least 80 mol-% carbon atoms,
• the region comprises a first area in such a way that the first area is smaller than the region;
• whereby the region and the first area define a base that is comprised by the difference of the region and the first area;
• the method comprising
• generating a first light pulse sequence with first light pulse sequence property values, the first light pulse sequence comprising at least one light pulse,
• exposing the first area to said first light pulse sequence in a first process environment having a first oxygen content, without exposing at least part of the base to said first light pulse sequence, wherein
• generating the first light pulse sequence using a laser, such that a light pulse of the first light pulse sequence comprises photons having a wavelength from 400 nm to 1100 nm, thereby
• oxidizing locally, in the first area, at least some carbon atoms of the piece of carbon nanomaterial by two-photon or multiphoton oxidation, in such a way, that
• at most 10% of the carbon atoms of the first area are removed from the first area and
• after said exposing the first area to said first light pulse sequence, in the first area, the molar ratio of oxygen to carbon atoms has a first value, the first value being greater than the base value;
• thereby
• patterning the first area of the piece of carbon nanomaterial, wherein
• the light pulse of the first light pulse sequence has an intensity from 109 W/(cm)2 to 1014 W/(cm)2.