**6. Acknowledgment**

The authors would like to thank Dr. D. Pisignano, and Dr. E. Mele of the Center for Biomolecular Nanotechnologies @UNILE, Istituto Italiano di Tecnologia Via Barsanti, 73010 Arnesano (LE) and Dr. L. Persano of the National Nanotechnology Laboratory (NNL) of CNR - Istituto di Nanoscienze, via per Arnesano, 73100 Lecce, Italy for the formation of the patterned structures presented in this work.
