Direct synthesis of crystalline graphtetrayne-A new graphyne allotrope

Abstract

We report a bottom-up synthesis of a new graphyne allotrope-graphtetrayne (GTTY), which features four acetylene linkages between the adjacent benzene on the surface of copper under low temperature. The as-prepared GTTY exhibited nanosheet morphology with an average thickness of 4.5 nm. Structural analysis based on high-resolution transmission electron microscopy (HR-TEM)/selected area electron diffraction (SAED) characterizations revealed high crystallinity formed with a ninefold stacking structure. The GTTY displayed excellent semiconductor properties bearing a band gap of 1.3 eV and a conductivity of 0.285 S m−1 at room temperature. Moreover, by the space-charge-limited current (SCLC) method, the measured hole and electron mobilities of the GTTY films reached up to 1.47 × 103 cm2 V−1 S−1 and 2.98 × 103 cm2 V−1 S−1, respectively.