Erratum to: Appl Nanosci DOI 10.1007/s13204-013-0285-y

In the original publication of the article, the two author names A. Ispas and G. Carac were not included in author group. These authors had an important contribution to the development of the experiments. The complete author group is given below:

C. Gheorghies, D. E. Rusu, A. Ispas, A. Bund, G. Carac, S. Condurache-Bota, L. P. Georgescu.