Spontaneous hierarchical self-organization of nanometre-scale subunits into higher-level complex structures is ubiquitous in nature. The creation of synthetic nanomaterials that mimic the self-organization of complex superstructures commonly seen in biomolecules has proved challenging due to the lack of biomolecule-like building blocks that feature versatile, programmable interactions to render structural complexity. In this study, highly aligned structures are obtained from an organic–inorganic mesophase composed of monodisperse Cd37S18 magic-size cluster building blocks. Impressively, structural alignment spans over six orders of magnitude in length scale: nanoscale magic-size clusters arrange into a hexagonal geometry organized inside micrometre-sized filaments; self-assembly of these filaments leads to fibres that then organize into uniform arrays of centimetre-scale bands with well-defined surface periodicity. Enhanced patterning can be achieved by controlling processing conditions, resulting in bullseye and ‘zigzag’ stacking patterns with periodicity in two directions. Overall, we demonstrate that colloidal nanomaterials can exhibit a high level of self-organization behaviour at macroscopic-length scales.
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This work was supported in part by the National Science Foundation (NSF) under award numbers CHE-1507753, CHE-2003586, CMMI-1941135, CHE-1665305 and DMR-1809429. Electron microscopy was supported by the NSF under award number DMR-1654596. This work was partially supported by the Cornell Center for Materials Research and made use of the Cornell Center for Materials Research shared facilities, with funding from the the NSF MRSEC programme (number DMR-1719875). R.S.S. acknowledges financial support from the NSF Graduate Research Fellowship Programme under grant no. DGE-1650441. From the Department of Chemical and Biomolecular Engineering at Cornell University, we thank Y. Cheng for AFM analysis and K. Niccum and M. Johnson for their pioneering work.
The authors declare no competing interests.
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Han, H., Kallakuri, S., Yao, Y. et al. Multiscale hierarchical structures from a nanocluster mesophase. Nat. Mater. 21, 518–525 (2022). https://doi.org/10.1038/s41563-022-01223-3
Nature Materials (2022)