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Two-dimensional crystals of mesoporous silica SBA-15 nanosheets with perpendicular and open channels
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See supplementary material at http://dx.doi.org/10.1063/1.4897203
for the experimental details and additional data, including the nitrogen adsorption isotherm and XRD patterns, SEM image of a hexagon 2D crystal of SBA(⊥)-pH2, SEM image and ultra-thin microtomed TEM image of mesoporous silica synthesized at pH2 and a table showing the textural properties of SBA(⊥)-pH5 and SBA(⊥)-pH2.[Supplementary Material]
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A preparation of mesoporous silica SBA-15 thin sheets with perpendicular nanochannels (SBA(⊥)) and open ends is reported here. At a synthesis condition of pH = 2 where the silica condensation is extremely slow, micron-sized single-crystal-like hexagonally faceted nanosheets (SBA(⊥)-pH2) with aspect ratio of 10–50 were formed. The nanosheets can attach to each other in sideway to extend the thin sheet. At pH = 5, multi-domain SBA(⊥)-pH5 nanosheets are formed, and stacking attachment of sheets is preferred. Vivid Moiré patterns are observed in large areas of stacked silica sheets, indicating excellent structure order.
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