1. Department of Applied Sciences, The PNG University of Technology, Lae MP 411, Morobe Province, Papua New Guinea
2. Department of Electronic and Electrical Engineering, Trinity College Dublin, The University of Dublin, D02 PN40 Dublin, Ireland
3. School of Chemistry, Trinity College Dublin, The University of Dublin, D02 PN40 Dublin, Ireland
4. Intelligent Polymer Research Institute, University of Wollongong, Wollongong, NSW 2522, Australia