▎ 摘　　要

NOVELTY - A graphene nanoribbon precursor comprises substituted terphenyl compound (I). USE - Graphene nanoribbon precursor for use in graphene nanoribbon that is utilized in electronic device for a channel of a FET, and a resonant tunneling diode (all claimed). ADVANTAGE - The nanoribbon precursor has improved physical properties. DETAILED DESCRIPTION - A graphene nanoribbon precursor comprises substituted terphenyl compound of formula (I). n=1-6; and X, Y1, Z=F, Cl, Br, I, H, OH, SH, SO2H, SO3H, SO2NH2, PO3H2, NO, NO2, NH2, CH3, CHO, COCH3, COOH, CONH2, COCl, CN, CF3, CCl3, CBr3, or CI3, when desorption temperatures of X, Y1 and Z from carbon atoms constituting six-elemented rings are respectively TX, TY, and TZ, a relationship of TX less than or equal to TY less than or equal to TZ is satisfied. INDEPENDENT CLAIMS are also included for the following: (1) a graphene nanoribbon comprising repeat unit of formula (II), where edge structure at both ends along a length direction is an armchair type (2) a method of producing a graphene nanoribbon precursor, which involves causing a Suzuki coupling reaction between a first substance and a second substance to obtain a third substance, where first substance has a structure of formula (III), the second substance has a structure of formula (IV), the third substance is a bond at a location of one iodine included in the first substance and embedded image causing a Suzuki coupling reaction between the third substance and the second substance to obtain a fourth substance having a bond at a location of iodine included in the third substance (3) a method for producing a graphene nanoribbon, which involves heating graphene nanoribbon precursors to a first temperature on a substrate to induce desorption of X and C-C bonding reaction to obtain a polymer on the substrate, heating the polymer to a second temperature, which is higher than the first temperature, to induce desorption of Y and C-C bonding reaction and heating the polymer to a third temperature, which is equal to or higher than the second temperature, to induce desorption of Z and C-C bonding reaction.