Graphitization behavior of iodine-treated Bombyx mori silk fibroin fiber

Abstract

Abstract:In order to investigate the graphitization behavior of Bombyx mori silk fibroin (SF) fibers, structural inspection of carbonized SF fibers treated with iodine vapor was studied at different temperatures, from 800 to 1400 °C. Wide angle X-ray diffraction measurement suggested that both untreated and iodinated SF fiber exhibited amorphous structure carbonized to 1200 °C. After carbonized at 1400 °C for 12h, a graphite-like structure was obtained. Raman spectroscopy and transmission electron microscopic observation showed that the graphite layers of SF fibers became more ordered after iodine treatment. The carbon yield obtained at higher temperature (1400 °C) after iodine treatment was higher, ca. 28wt%, than that of untreated SF.

Animal Silk-Derived Amorphous Carbon Fibers for Electricity Generation and Solar Steam Evaporation

“…Therefore, there is no doubt that other structures, such as molecular chain orientation, nanofibrils, and their associated interfaces, in animal silks should also play an essential role in the structural stability and the mechanical performance of a carbonized silk. A detailed carbonization mechanism of animal silks in this regard deserves further analysis (Majibur Rahman Khan et al, 2009;Cho et al, 2015Cho et al, , 2017. Comparing the carbonized structures of different silks will undoubtedly promote understanding of the structure-property relationship of a carbonized silk family.…”