Cascade growth and performance optimization of a laminated heterointerface based on graphdiyne

Abstract

Herein, we developed a cascade growth strategy to fabricate laminated heterostructures based on graphdiyne (GDY), which can not only retain the intrinsic structure of GDY to the maximum extent, but can also realize the effective regulation of its basic properties. A chlorine heteroatom-doped GDY film (Cl-GDY/GDY) was prepared by coupling hexaalkynylbenzene with a copper substrate pre-decorated with chlorine-substituted GDY (Cl-GDY). An interweaved aggregating morphology consisting of nanofibers and nanosheets was observed, which can be assigned to Cl-GDY and GDY components, respectively. Moreover, the interaction between Cl-GDY and GDY induced a tunable energy level structure. As a result, the conductive properties of the Cl-GDY/GDY films were enhanced by an order of magnitude rather than the simple superposition of the two components, which was clearly observed in both a carbon/electrolyte electrochemical cell and the carbon-based heterojunction device.