Peptide-Controlled Assembly of Macroscopic Calcium Oxalate Nanosheets

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  • Hao Lu, Max Planck Institute for Polymer Research
  • ,
  • Arne Schäfer, Max Planck Institute for Polymer Research
  • ,
  • Helmut Lutz, Max Planck Institute for Polymer Research
  • ,
  • Steven J. Roeters
  • Ingo Lieberwirth, Max Planck Institute for Polymer Research
  • ,
  • Rafael Muñoz-Espí, Universitat Politècnica de València
  • ,
  • Matthew A. Hood, Max Planck Institute for Polymer Research
  • ,
  • Mischa Bonn, Max Planck Institute for Polymer Research
  • ,
  • Tobias Weidner

The fabrication of two-dimensional (2D) biomineral nanosheets is of high interest owing to their promise for applications in electronics, filtration, catalysis, and chemical sensing. Using a facile approach inspired by biomineralization in nature, we fabricate laterally macroscopic calcium oxalate nanosheets using β-folded peptides. The template peptides are composed of repetitive glutamic acid and leucine amino acids, self-organized at the air-water interface. Surface-specific sum frequency generation spectroscopy and molecular dynamics simulations reveal that the formation of oxalate nanosheets relies on the peptide-Ca 2+ ion interaction at the interface, which not only restructures the peptides but also templates Ca 2+ ions into a calcium oxalate dihydrate lattice. Combined, this enables the formation of a critical structural intermediate in the assembly pathway toward the oxalate sheet formation. These insights into peptide-ion interfacial interaction are important for designing novel inorganic 2D materials.

TidsskriftJournal of Physical Chemistry Letters
Sider (fra-til)2170-2174
Antal sider5
StatusUdgivet - 2019

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