Synthesis of carbon nitride nanocrystals on SBA-15 microparticles by a constant-pressure solvothermal method

Crystalline carbon nitride film synthesized by ion beam assisted magnetron sputtering and thermal annealing in nitrogen gas

“…However, the formation of high pure crystalline β-C3N4 is not confirmed yet. In most cases, the grown carbon nitride films were seriously nitrogen deficient compared with stoichiometric β-C 3 N 4 [11][12][13][14][15][16][17][18][19][20]. It is still a challenging topic for preparing carbon nitride films with high crystallinity and high nitrogen content by experimental method.…”

Enhancement of the graphitic carbon nitride surface properties from calcium salts as templates

“…located at 1568 cm -1 , that is associated with the bending vibration of the C=N bond in a similar environment. As largely reported in the literature, an incomplete polycondensation of the starting precursor which leads to carbon nitride phase formation is usually observed [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]29]. This phenomenon, which is also observed in our case and for all the investigated samples, is suggested by the presence of some infrared bands described as follows: (i) those at 900 cm -1 and 1650 cm -1 related to the stretching vibrations of the C-N bond modes in a primary amine function (C-NH 2 ); (ii) those in the 3000-3300 cm -1 region with characteristics of the N-H and O-H stretching vibrations, which are due to primary amine (-NH 2 ) and water molecules adsorbed on the surface of the material; and (iii) the low-intensity band observed at 2160 cm -1 which can be attributed to the -C≡N, -N=C=O or -N=C=N-functions [11,13,17,21,[23][24][25].…”

“…Typically, carbon nitride powders are synthesized through the pyrolysis of carbon-and nitrogen-rich molecules (cyanamide, melamine, dicyandiamide, cyanuric species, guanidine salts) at relatively low temperatures (500-600°C) [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. These methods yield materials with low specific surface areas (< 10m²/g) which limit using the materials in many potential applications in particular in the separation, selection and catalysis fields.…”

“…These methods yield materials with low specific surface areas (< 10m²/g) which limit using the materials in many potential applications in particular in the separation, selection and catalysis fields. There has been a lot of interest in enhancing the C 3 N 4 -g material's surface properties such as specific area, porosity and pore diameter, and many teams have published papers on classical uses of templates to prepare porous carbonaceous materials such as silica in the form of spheres [6,27] or matrices [17,22,28]. Zeolites (HZSM-5) [29], layered clays (saponite, montmorillonite) [30], and alumina porous coordination polymers [10] have also been employed successfully as hard templates.…”

Ordered Mesoporous Carbons Enriched with Nitrogen: Application to Hydrogen Storage

“…This process was then adapted by Vinu and co-workers to develop ordered mesoporous carbon nitrides using silica templates (SBA-15 or SBA-16). Other techniques are also possible to synthesize similar porous carbon nitrides such as the melting of cyanamide with dispersed silica nanoparticles , or solvothermal synthesis (controlled pressure and temperature) . The types of nitrogen functions will obviously vary from one experimental method to the other.…”