Scientific Reports 6: Article number: 31974; published online: 23 August 2016; updated: 22 September 2016

In the original version of this Article, there were typographical errors in Affiliation 1 which was incorrectly given as ‘Multidisciplinary Nanotechnology Centre, College of Engineering, Swansea University, Bay Campus, Swansea, SA1 8QQ, UK.’ The correct affiliation is listed below:

Multidisciplinary Nanotechnology Centre, College of Engineering, Swansea University, Bay Campus, Swansea, SA1 8EN, UK.

This error has now been corrected in the PDF and HTML versions of this Article.