[1] Natl Univ Singapore, Ctr Nanotechnol & Sustainabil, Dept Mech Engn, Singapore 117574, Singapore
[2] ASTAR, Inst Mat Res & Engn IMRE, 08-03,2 Fusionopolis Way, Singapore 138634, Singapore
[3] Nouveau Monde Graphite, 481 Rue Brassard,St Michel St, St Michel De Saints, PQ J0K 3B0, Canada
[4] Concordia Univ, Dept Chem & Mat Engn, 1455 Blvd Maisonneuve, Montreal, PQ H3G 1M8, Canada