▎ 摘　　要

NOVELTY - Production of graphene nanoribbons involves (i) synthesizing a polyaromatic-based polymer (II) by eliminating mutual groups (X) from the group of polyaromatic hydrocarbon compounds (I) and bonding carbon atoms of the aromatic ring from which the group (Y') is eliminated, and (ii) synthesizing polyaromatic-based polymer (III) by eliminating group (Y') from the polymer (II) and bonding carbon atoms of the aromatic ring from which the group (Y') is eliminated. USE - Production of graphene nanoribbons used in semiconductor device e.g. field effect transistor for electronic devices. Uses include but are not limited to personal computer, supercomputer, server, smartphone, mobile phone, tablet terminal, sensor, camera, audio equipment, measuring device, and inspection device. ADVANTAGE - The method enables stable production of graphene nanoribbons having a predetermined length and width, by controlling the polymerization of compounds. The graphene nanoribbons provide semiconductor device having high performance. DETAILED DESCRIPTION - Production of graphene nanoribbons involves (i) synthesizing a poly aromatic-based polymer of formula (II) by eliminating mutual groups (X) from the group of poly aromatic hydrocarbon compounds of formula (I) and bonding carbon atoms of the aromatic ring from which the group (Y') is eliminated, and (ii) synthesizing polyaromatic-based polymer of formula (III) by eliminating group (Y') from the polymer (I) and bonding carbon atoms of the aromatic ring from which the group (Y') is eliminated. =1-3; t=1-4; n=degree of polymerization;and X,Y',Z'=group in which the bond energy with carbon atom of aromatic ring increases in the order of C-X bond, C-Y' bond and C-Z' bond, preferably I, Br, Cl, or F.