▎ 摘　　要

NOVELTY - Preparing superconducting micron fiber comprises (i) enabling 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) oxidized cellulose to pass through a microfluidizer at a time to prepare nanofibrillar cellulose (NFC); (ii) oxidizing graphite by a Hummer's method to obtain graphene oxide (GO); (iii) preparing high-strength micron fiber by extruding a spinning solution into alcohol coagulation bath by a needle tube, precipitating to obtain gel fiber, pulling the gel fiber out from the coagulation bath and drying in air; and (iv) carrying out carbonization. USE - The superconducting micron fiber is useful as electric conduction material (claimed). ADVANTAGE - The micron fiber c(GO+NFC) has the average conductivity of 649 plus minus 60 S/cm which is maximum in the reported conductivity nowadays, and has higher conductivity than the conductivities of carbonized NFC micron fiber and carbonized GO micron fiber. DETAILED DESCRIPTION - Preparing superconducting micron fiber comprises (i) enabling 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) oxidized cellulose to pass through a microfluidizer at a time to prepare nanofibrillar cellulose (NFC); (ii) oxidizing graphite by a Hummer's method to obtain graphene oxide (GO); (iii) preparing high-strength micron fiber by extruding a spinning solution into alcohol coagulation bath by a needle tube, precipitating to obtain gel fiber, pulling the gel fiber out from the coagulation bath, drying in air, applying certain force to the two ends of the micron fiber in the drying process to improve the degree of orientation of the micron fiber, placing the micron fiber in 10 wt.% of calcium chloride aqueous solution, dipping for 1 hour, and drying again; and (iv) carrying out carbonization on the high-strength micron fiber to obtain the conductive micron fiber containing GO and NFC. An INDEPENDENT CLAIM is also included for superconducting micron fiber, prepared by the above method.