This article presents the successful bottom-up synthesis of zigzag graphene nanoribbons (ZGNRs) with atomically precise edges. The researchers developed a novel method involving surface-assisted polymerization and cyclodehydrogenation of specifically designed precursor monomers, which enabled the formation of ZGNRs with well-defined zigzag edges. The synthesis was carried out on a clean Au(111) surface, with the precursor monomers thermally deposited and subsequently annealed to facilitate polymerization and cyclization. The resulting ZGNRs were characterized using scanning tunneling microscopy (STM) and non-contact atomic force microscopy (nc-AFM), revealing atomically precise edges with the expected CH termination. The edge states of the ZGNRs were further investigated using differential conductance spectroscopy, which showed distinct resonance peaks near the Fermi level, indicating the presence of spin-polarized edge states. The study also highlights the importance of controlling ZGNR-substrate interactions to accurately characterize their electronic properties. The successful synthesis of ZGNRs opens new possibilities for exploring their unique electronic, optical, and magnetic properties, as well as for the development of spintronic devices. The research demonstrates the potential of bottom-up fabrication approaches for creating complex carbon nanostructures with precise control over their edge geometries and electronic properties. The study is a significant advancement in the field of graphene-based nanotechnology, offering a pathway to the controlled manipulation of spin states in graphene-based circuitry.This article presents the successful bottom-up synthesis of zigzag graphene nanoribbons (ZGNRs) with atomically precise edges. The researchers developed a novel method involving surface-assisted polymerization and cyclodehydrogenation of specifically designed precursor monomers, which enabled the formation of ZGNRs with well-defined zigzag edges. The synthesis was carried out on a clean Au(111) surface, with the precursor monomers thermally deposited and subsequently annealed to facilitate polymerization and cyclization. The resulting ZGNRs were characterized using scanning tunneling microscopy (STM) and non-contact atomic force microscopy (nc-AFM), revealing atomically precise edges with the expected CH termination. The edge states of the ZGNRs were further investigated using differential conductance spectroscopy, which showed distinct resonance peaks near the Fermi level, indicating the presence of spin-polarized edge states. The study also highlights the importance of controlling ZGNR-substrate interactions to accurately characterize their electronic properties. The successful synthesis of ZGNRs opens new possibilities for exploring their unique electronic, optical, and magnetic properties, as well as for the development of spintronic devices. The research demonstrates the potential of bottom-up fabrication approaches for creating complex carbon nanostructures with precise control over their edge geometries and electronic properties. The study is a significant advancement in the field of graphene-based nanotechnology, offering a pathway to the controlled manipulation of spin states in graphene-based circuitry.