Abstract
We demonstrate the aqueous self-assembly of ligand-assisted SnO2 sol precursors onto preformed poly-l-lysine templates through interfacial electrostatic forces (COO−/NH3+). On the removal of organics, two unique coral-like and sea worm-like textures consisting of hierarchical pores (macropores and mesopores) and nanocrystalline SnO2 frameworks are synthesized, mainly depending on the chelator/Sn molar ratio. Structural formation is discussed based on acid-base interaction and interfacial charge density matching. For the first time, metal oxide structures mediated by polypeptides are reported. More importantly, the method described here might open a generally attractive route for synthesizing complex nanostructures of other oxides (e.g., ZnO, TiO2, and ZrO2).
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This work was jointly supported by the Singapore Institute of Manufacturing Technology (A*STAR) and the Nanyang Technological University. We gratefully thank the laboratory facilities from Nanyang Technological University.
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Zhu, J., Zhang, T.S., Ma, J. et al. Fabrication of porous/hollow tin (IV) oxide skeletons from polypeptide mediated self-assembly. Journal of Materials Research 22, 2448–2453 (2007). https://doi.org/10.1557/jmr.2007.0303
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DOI: https://doi.org/10.1557/jmr.2007.0303