▎ 摘　　要

NOVELTY - Making a graphene nanoribbon (GNR) comprises: (a) contacting a poly(phenylene ethynylene) (PPE) polymer, an annulating compound, and a catalyst system comprising a metal catalyst and a protic acid, such that the PPE polymer is arylannulated; and (b) oxidizing the arylannulated polymer product from (a) to form graphene nanoribbon. USE - The graphene nanoribbon is useful in device, which is transistor, a solar cell, and a light emitting diode (claimed). ADVANTAGE - The process can provide GNRs having controlled length, width, and edge composition at onset synthesis DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the GNR having a structure of formulae (A)- R1-R4 = H, alkyl, aryl, ether, thioether, ester, carboxylic acid, amide, halide, or azide, where each occurrence in the GNR; n = 10-500; and +t = 10-500.