Correction to: Nature Nanotechnology https://doi.org/10.1038/s41565-018-0183-2​, published online 16 July 2018.

In the version of this Article originally published, in the first paragraph of the Methods, HFE was incorrectly given as 2,2,2-Trifluoroethyl-3ʹ,3ʹ,3ʹ,2ʹ,2ʹ-pentafluoropropyl ether; it should have been 1,1,2,2-tetrafluoroethyl-2ʹ,2ʹ,2ʹ-trifluoroethyl ether. This has now been corrected in the online versions of the Article.