Correction to: NPG Asia Materials (2014) 6, e138; doi:10.1038/am.2014.98; published online 17 October 2014

After the online publication of this article, the authors noticed an error in the Acknowledgements section.

The correct statements in the Acknowledgements section of this article should have read as below.

This work was supported by the Global Frontier Program through the Global Frontier Hybrid Interface Materials (GFHIM) of the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (2013M3A6B1078875) or (2013-073298). The ex situ studies, performed using the RIKEN Beam line at Spring-8 (Japan), was supported by the Pohang Accelerator Laboratory (PAL) through the abroad beam-time program of the Synchrotron Radiation Facility Project under MEST and is gratefully acknowledged.

The authors apologize for the error.