Towards the standardization of fullerene nanofibers using Raman spectroscopy Erlon H Martins Ferreira, Lingling Ren, Guangzhe Piao, Soon Hyung Hong, Masaru Tachibana, Valter Sergo, Alois Bonifacio, Froylan Martinez, Ryoei Kato and Kun’ichi Miyazawa Published online: 21 September 2015 DOI: 10.1051/metrology/20150014004