1. Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu pl.19, Kaunas LT-50254, Lithuania
2. Department of Electronic Devices, Lviv Polytechnic National University, S. Bandera 12, Lviv 79013, Ukraine
3. Low Dimensional Material Research Centre, Department of Physics, University Malaya, Kuala Lumpur 50603, Malaysia