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Electrical Properties of Cellulose-Based Carbon Fibers Investigated Using Atomic Force Microscopy
심이나,한성옥,김희연,한인섭,김세영,서두원,성영훈,John Foord 한국고분자학회 2014 Macromolecular Research Vol.22 No.9
Natural fibers have been actively investigated for the reinforcement of biocomposite, absorbent, and functionalfibers, because of their environmentally friendly properties. We manufactured carbon materials based on twodifferent natural fibers by heat treatment at 700, 900, and 1100 oC, respectively. The thermal behavior, surface morphology,and electrical properties of these carbon materials were investigated by thermogravimetric analysis (TGA)and atomic force microscopy (AFM); specifically, the electrical properties were studied through three-dimensionalcurrent images, and the current-voltage curve (I-V) characteristics using current-atomic force microscopy (c-AFM) ona nano-ampere scale. The thermal stability, roughness, and local current of the carbon materials were improved byincreasing the carbonization temperature, and carbonized filter paper (FP) showed higher values in all characterizationanalyses than carbonized henequen (HQ) due to the higher content of cellulose in FP. Moreover, the currentvoltagecharacteristics of carbonized FP at 1100 oC and commercial carbon fiber were similar at high voltages (-5 or 5V). Therefore, we expected that carbon materials from FP would be more suitable than HQ for use as environmentallyfriendly electrode materials.