Correction to: Nature Nanotechnology https://doi.org/10.1038/s41565-018-0307-8 published online 26 November 2018.

In the version of the Supplementary Information file originally published with this Article, the images used for Supplementary Fig. 4 were incorrect and have now been replaced. This does not affect the results of the Article.

Supplementary Fig. 4
figure 4

Original and Corrected.