The true liquid crystal phases of 2D polymeric carbon nitride and macroscopic assembled fibers

Abstract

We report that controlled graphitic carbon nitride (g-CN) which has high aspect ratio and expanded interlayer spacing can exhibit lyotropic liquid crystalline (LC) phase in concentrated sulfuric acid. By utilizing its LC phase, a g-CN fiber for the first time was successfully fabricated.

Highly Efficient Polymeric Carbon Nitride Photoanode with Excellent Electron Diffusion Length and Hole Extraction Properties

“…As previously reported, the addition of a sulfur-containing monomer can modify the texture of the CN network during the polymerization process, which results in a better crystal packing. [32][33][34] The structure of the CN nanosheets was analyzed by transmission electron microscopy (TEM). CN-MS/M and CN-MSG/M display thinner and more crystalline nanosheets in comparison with CN-M (Figures 3d and S20).…”

Carbon Nitrides from Supramolecular Crystals: From Single Atoms to Heterojunctions and Advanced Photoelectrodes

“…[44,45] The resulting aggregates, however, display a large molecular size, and even though they can be solubilized employing solvents such as dimethyl formamide (DMF) or dimethyl sulfoxide (DMSO), their fast precipitation often leads to small particles with partially crystalline and amorphous domains, which complicates the elucidation of their structure by means of single crystal X-ray diffraction (SC-XRD). [46,47] To achieve the crystal size and quality required for SC-XRD, different crystallization techniques can be employed, such as slow solvent evaporation, solvent diffusion, and vapor diffusion. These techniques rely on the solubilization of a given molecule or complex, and the supersaturation of the resulting solution by different means.…”

Partially cross-linked carbon nitride with unimpeded charge transfer between different chains for boosting photocatalytic hydrogen production

“…Carbon nitride (CN), a polymeric semiconductor, is of broad interest in the field of photocatalysis as it possesses properties different from those of well-known metal oxide/sulfide photocatalysts, including feasibly tuned electronic structure and “earth-abundant” nature. 1–4 Its synthesis from various C/N/H-containing precursors is usually cheap and facile, while allowing a wide structural variety. 5 For example, as shown in Fig.…”