Fig. 1

The structure and appearance of HsGDY. a Schematic diagram of the synthesis of the HsGDY, (1) Tribromobenzene, (2) Tris[(trimethylsilyl)ethynyl]benzene, (3) Triethynylbenzene, (4) carbon-rich framework HsGDY. b The photograph of free-standing HsGDY films. c Carbon species and functional groups in HsGDY. d 13C solid-state NMR spectrum of HsGDY. e XRD patterns of HsGDY. f XPS spectrum of HsGDY. g Raman spectrum of HsGDY and h FT-IR spectrum of HsGDY