Correction to: Nature Materials https://doi.org/10.1038/s41563-018-0109-2, published online 18 June 2018.

In the version of this Perspective originally published, Fig. 1 was missing the credit for the inset to panel a, and ref. 76 was missing from the reference list. The caption should have included the text: ‘Reproduced from ref. 76, American Chemical Society (a, inset).’; where ref. 76 is ‘Gao, J., Loi, M. A., de Carvalho, E. J. F. & dos Santos, M. C. Selective wrapping and supramolecular structures of polyfluorene–carbon nanotube hybrids. ACS Nano 5, 3993–3999 (2011)’. These errors have now been amended in the online versions.