While bottom-up syntheses of ordered nanostructured materials at colloidal length scales have been successful at producing close-packed materials, it is more challenging to synthesize non-close-packed (ncp) structures. Here, a metal oxide nanostructure with ncp hollow sphere arrays was synthesized by combining a polymeric colloidal crystal template (CCT) with a Pechini precursor. The CCT provided defined confinement through its tetrahedral (Td) and octahedral (Oh) voids where the three-dimensionally (3D) ordered, ncp hollow sphere arrays formed as a result of a crystallization-induced rearrangement. This nanostructure, consisting of alternating, interconnected large and small hollow spheres, is distinct from the inverse opal structures typically generated from these CCTs. The morphology of the ncp hollow sphere arrays was retained in pseudomorphic transformations involving sulfidation and reoxidation cycling despite the segregation of zinc during these steps.
Bibliographical noteFunding Information:
This project is financially supported by the Gas Sub-Committee R&D arm of Abu Dhabi National Oil Company, UAE. Part of this work was conducted at the University of Minnesota Characterization Facility, which receives partial support from the NSF through the NNIN program. We thank Prof. R. L. Penn for use of the XRD.
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
- hierarchical structures
- hollow sphere arrays
- metal oxide
- non-close-packed architecture