Large-scale synthesis of 2D-silica (SiO_x) nanosheets using graphene oxide (GO) as a template material

Abstract

Graphene oxide (GO) was used in this study as a template to successfully synthesize silicon oxide (SiOx) based 2D-nanomaterials, adopting the same morphological features as the GO sheets.

Structure-directing synthesis of porous CuO–SiO2 nanocomposites using carbon nitride

“…Twodimensional materials have previously been used as templates for various materials (e.g., SiO 2 and metal oxide). 27,28,[31][32][33] However, with the method used in this study, carbon nitride was not able to control the CuO structure (morphology and porosity) by itself; the SiO 2 formation process induced by carbon nitride controlled the structure of CuO by supporting it with formed SiO 2 , and fluffy porous CuO-SiO 2 nanocomposites were fabricated. This study suggests that the synthesis method that uses the SiO 2 formation process induced by carbon nitride (twodimensional materials) in the presence of a precursor may control the structure of materials that cannot be controlled by two-dimensional materials alone (although the SiO 2 remains in the product).…”

“…In addition to zero-, one-, and three-dimensional materials, two-dimensional materials have recently been actively investigated as templates. The synthesis of silica, silicon, metal, metal oxide (even CuO), transition metal dichalcogenide, and carbon nanosheets with controlled nanosheet size and thickness, unique structures, and superior porosity using graphene oxide and graphitic carbon nitride (g-C 3 N 4 ) as templates has been proposed, [26][27][28][29][30][31][32][33][34][35][36] and the construction of zeolites with nanopores generated by polymer-functionalized graphene oxide removal was reported. 37 Furthermore, the construction of ultrathin amorphous metal oxide nanosheets using a lamellar Cu 2 Ooleate complex as a two-dimensional confining template has been demonstrated.…”

“…However, studies have not progressed on the use of carbon nitride to control the nanocomposite structure in CuO and SiO 2 , which have elemental abundance, low toxicity, and high thermal and chemical stability. 27 In this study, porous CuO-SiO 2 nanocomposites having a high specific surface area and unique morphologies were developed using a structure-directing synthesis to control the formation of CuO and SiO 2 . Polyhedral oligomeric silsesquioxane (POSS), in which Si and O are arranged in a cage structure, and carbon nitride were used as the SiO 2 source and the structure-directing agent, respectively.…”

“…However, studies have not progressed on the use of carbon nitride to control the nanocomposite structure in CuO and SiO 2 , which have elemental abundance, low toxicity, and high thermal and chemical stability. 27…”