Retraction Note: Tang et al. Nanoscale Research Letters (2020) 15:63

The Editors-in-Chief have retracted this article because there appear to be anomalies in four of the figures, specifically Figure 5, Figure 6A, Figure 6C and Figure 8A. The Editors-in-Chief therefore no longer have confidence in the data presented. The authors have been invited to submit a new manuscript for peer review. Xialong Tang stated on behalf of all co-authors that they do not agree with this retraction.