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| Graphitic carbon nitride | |
|---|---|
| Name | Graphitic carbon nitride |
| Formula | C3N4 (approximate) |
| Molar mass | ~66.0 g·mol−1 (monomeric unit) |
| Appearance | Yellow to brownish polymeric solid |
| Density | ~1.4–1.8 g·cm−3 |
| Melting point | >600 °C (decomposes) |
| Solubility | Insoluble in common solvents |
| Other names | g-C3N4, carbon nitride |
Graphitic carbon nitride is a polymeric, layered material composed primarily of carbon and nitrogen, typically represented by the empirical composition C3N4. It occupies a prominent place in contemporary materials science research related to heterogeneous catalysis, energy conversion, and optoelectronics. Interest in the material spans groups studying semiconductor physics, surface science, and chemical engineering at institutions such as Massachusetts Institute of Technology, Max Planck Society, University of Cambridge, and Tsinghua University.
Graphitic carbon nitride adopts a layered, graphite-like topology based on tri-s-triazine (heptazine) or triazine units arranged in a two-dimensional network; structural models reference motifs studied by researchers at Oak Ridge National Laboratory, Lawrence Berkeley National Laboratory, and ETH Zurich. The extended conjugated framework yields electronic structure features investigated in the context of band structure calculations performed by teams affiliated with Princeton University, Stanford University, and University of California, Berkeley. Crystallographic and theoretical comparisons often cite analogies with graphite, graphene, and synthetic allotropes explored by groups linked to Rice University and Cornell University.
Typical synthesis routes employ thermal polymerization of nitrogen-rich precursors such as melamine, dicyandiamide, and cyanamide in studies from Fujian Normal University, Seoul National University, and University of Tokyo. Variants include chemical vapor deposition (CVD) methods developed in laboratories at Columbia University and solvothermal approaches investigated by researchers at Peking University. Doping and composite preparation—combining g-C3N4 with metals or oxides—has been reported by collaborative teams from Imperial College London, Swiss Federal Institute of Technology Lausanne, and Kyoto University to tune electronic and catalytic properties.
Structural and compositional analysis employs X-ray diffraction (XRD) instruments utilized in facilities like Diamond Light Source, European Synchrotron Radiation Facility, and Brookhaven National Laboratory; spectroscopy methods include X-ray photoelectron spectroscopy (XPS) routinely used at Argonne National Laboratory, Fourier-transform infrared spectroscopy (FTIR) common in Tokyo Institute of Technology labs, and solid-state nuclear magnetic resonance (NMR) developed by groups at California Institute of Technology. Optical and electronic characterization often involves UV–vis spectroscopy, photoluminescence (PL) measured in experiments at National Institute of Standards and Technology, and scanning probe microscopies such as atomic force microscopy (AFM) employed at Max Planck Institute for Polymer Research.
Graphitic carbon nitride exhibits semiconductor behavior with a visible-light band gap typically around 2.7 eV; electronic properties have been modeled by theoretical groups at Harvard University, University of Chicago, and University of Oxford. Thermal stability and decomposition pathways have been studied in high-temperature facilities such as Sandia National Laboratories and Lawrence Livermore National Laboratory. Surface basicity, Lewis and Brønsted sites, and defect chemistry are characterized in work linked to ETH Zurich, Ecole Polytechnique, and National University of Singapore to understand adsorption and activation of molecules including water and small organics.
The visible-light-driven photocatalytic activity of graphitic carbon nitride has been explored for photocatalytic water splitting and CO2 reduction by collaborative consortia involving ICREA, Kavli Institute, and CICenergiGUNE. Device-oriented research integrates g-C3N4 into photoelectrochemical cells, heterojunctions with titanium dioxide and molybdenum disulfide, and into composites reported by teams at EPFL, University of California, Los Angeles, and National Renewable Energy Laboratory. Studies on charge separation, recombination dynamics, and interface engineering reference experimental campaigns at Lawrence Berkeley National Laboratory and theoretical analyses from Los Alamos National Laboratory.
Beyond photocatalysis, graphitic carbon nitride has been investigated for uses in organic synthesis catalysis, sensors developed in collaboration with Siemens, and energy storage electrodes studied by groups at Tesla, Panasonic, and Samsung Advanced Institute of Technology. Biomedical research exploring antibacterial coatings and drug delivery platforms cites work from Johns Hopkins University and University College London. Environmental remediation applications—adsorption and degradation of pollutants—have been pursued by researchers at Wageningen University, University of Queensland, and Northwestern University.
Toxicological and environmental fate assessments have been carried out in studies associated with Environmental Protection Agency (United States), European Chemicals Agency, and academic laboratories at Yale University and National University of Singapore. General findings indicate low acute toxicity for bulk material, but nanoparticulate and functionalized derivatives warrant detailed ecotoxicology screens similar to protocols used by World Health Organization and Organisation for Economic Co-operation and Development. Lifecycle analyses comparing g-C3N4 production to materials evaluated by International Energy Agency and sustainability groups at United Nations Environment Programme inform considerations of scalability and environmental footprint.
Category:Carbon nitrides Category:Photocatalysts