2D silica
From Infogalactic: the planetary knowledge core
File:Graphene vs 2D silica-2.png
Top and side views of graphene (left) and HBS structures (right). Red atoms are oxygens.[1]
File:Defects in 2D silica and graphene.jpg
Models and TEM images of defects in HBS (middle) and graphene (bottom row): Stone-Wales (a), flower (b), divacancy (c) and a more complex, interstitial defect (d).[1]
File:Amorphous 2D silica TEM-2.jpg
TEM images of amorphous HBS
Two-dimensional silica (2D silica) is a layered polymorph of silicon dioxide. Two varieties of 2D silica, both of hexagonal crystal symmetry, have been grown so far on various metal substrates. One is based on SiO4 tetrahedra, which are covalently bonded to the substrate. The second comprises graphene-like fully saturated sheets, which interact with the substrate via weak van der Waals bonds. One sheet of the second 2D silica variety is also called hexagonal bilayer silica (HBS); it can have either ordered or disordered (amorphous) structure.[1]
2D silica has potential applications in electronics as the thinnest gate dielectric. It can also be used for isolation of graphene sheets from the substrate.[1]
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