1. Université Lille Nord de France, F-59508, Douai, France.
2. Ecole des Mines de Douai, Department of Polymers and Composites Technology & Mechanical Engineering, 941 Rue Charles Bourseul, BP-10838, Douai-Cedex, France.
3. Nanocyl SA, Rue de l'Essor, 4, B-5060, Sambreville, Belgium.
4. Department of Physics, Indian Institute of Technology, New Delhi-110016, India.