▎ 摘　　要

NOVELTY - A graphene nanoribbon (13) is fused cyclic compound chosen from compounds (I)-(VI). USE - Graphene nanoribbon is used as channel for electronic device (claimed) e.g. top gate-type field effect transistor and thin film transistor. ADVANTAGE - The graphene nanoribbon is capable of increasing the degree of freedom in selecting the band gap value. DETAILED DESCRIPTION - A graphene nanoribbon is fused cyclic compound chosen from compounds of formula (I)-(VI).m = integer. INDEPENDENT CLAIMS are included for the following: 1,4-diphenylbenzene compound of formula (A1) as graphene nanoribbon precursor; production of graphene nanoribbon, which involves polymerizing the compound (A1); and an electronic device, which comprises the graphene nanoribbon, and a pair of electrodes provided in contact with the graphene nanoribbon. a=1 or 3; b=2 or more; X=F, Cl, Br or I;and Y'=H or CH . DESCRIPTION OF DRAWING(S) - The drawing shows a top view of manufacturing process of field effect transistor. 13Graphene nanoribbon