Extraction of preformed graphene oxide from coal: its clenched fist form entrapping large molecules Pakhira, Bholanath ; Ghosh, Subrata ; Maity, Sheli ; Sangeetha, D. N. ; Laha, Ankita ; Allam, Afreen ; Sarkar, Sabyasachi Abstract Publication: RSC Advances Pub Date: 2015 DOI: 10.1039/C5RA15699H Bibcode: 2015RSCAd...589076P