Graphene nanoribbon precursor and method for producing graphene nanoribbon

A method of producing a graphene nanoribbon, the method comprising:

• heating a graphene nanoribbon precursor to a first temperature on a substrate to induce elimination of X and a C—C binding reaction to obtain a polymer on the substrate;
• and
• heating the polymer to a second temperature that is higher than the first temperature to induce elimination of H and Y and a C—C binding reaction,
• the graphene nanoribbon precursor having a structural formula represented by a following chemical formula (1), wherein in the following chemical formula (1) has a first case where n is 0;
• X is bromine, iodine or chlorine;
• and Y is fluorine and a second case where n is an integer greater than or equal to 1;
• X is bromine, iodine or chlorine;
• and Y is hydrogen or fluorine.