▎ 摘　　要

NOVELTY - A carbon sheet comprises 1-1013 nanohole defects per sheet size of 1 cm2, and positions of carbon present at the edge of the defect which is substituted with heteroelement. USE - Carbon sheet used for contrast agent, adsorbent and catalyst carrier (all claimed) in biotechnology, nanotechnology, and information technology applications. ADVANTAGE - The lightweight carbon sheet has excellent paramagnetic properties, by replacing positions of the carbon present at the edge of the nano-hole defect with hetero element, in which carbon atoms are aligned similar to graphene at low temperature through dehydration and carbonization reaction, flexibility, and specific surface area of 500 times or more. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of the carbon sheet, which involves reacting an aromatic compound of formula (I) in the presence of the dehydrating agent. A = O, N, S, P, or B;and R1-R5 = single bond, or linear or branched 1-20C alkyl or 6-20 aryl (both optionally substituted with O, N, S, P, or B or hydroxy, carbonyl, formyl, or carboxy).