Chemical vapor deposition–grown graphene was transferred onto a 300-nm SiO2/Si substrate as the substrate for the synthesis of GDY. The as-prepared graphene substrate was immersed into the dichloromethane solution of HEB (0.1 mM, 5 ml). Then, a pyridine solution (5 ml) of copper acetate (1.6 mM) and toluene (2 ml) were added to the dichloromethane solution of HEB. Under an inert argon atmosphere at room temperature, the successive catalytic coupling reaction for 24 hours led to the growth of the 2D covalent network, generating an ultrathin GDY film at the graphene surface. Using the same synthetic procedures, GDY can be synthesized on h-BN by using h-BN as the substrate for the synthesis of GDY. The as-prepared GDY on h-BN was used for PL and the electronic measurement. One- to few-layer graphene samples mechanically exfoliated on a 300-nm SiO2/Si substrate were also used to synthesize GDY for the thickness analysis.

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