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Liu S.,Huazhong Agricultural University | Liu S.,Jiangsu Province Biomass Energy and Materials Laboratary | Liu S.,Jiangnan University | Yu T.,Jiangnan University | And 3 more authors.
RSC Advances | Year: 2014

The integration of native polymers with electronic elements to form green electronics will be the subject of intense scientific research. In this work, conductive cellulose composite films have been prepared by in situ polymerization of aniline monomers in the cellulose scaffolds. The effects of reaction time, different dopants and the concentration of aniline monomer on the structure and properties of the composite films have been investigated. With the optimized reaction protocols, the structurally defined polyaniline (PANI)/cellulose composite films with PANI content of only about 24.6% exhibited electrical conductivity as high as 0.06 S cm-1, which could be compared with that of pure PANI. The PANI/cellulose films integrated the merits of cellulose and conductive polyaniline. The composite films with electrical conductivity performance were foldable and could be used as flexible electrode materials for supercapacitors. The specific capacitance of the films was about 120-160 F g-1 at current densities ranging from 0.1 to 0.5 A g -1 in the supercapacitor, and it maintained at least 81% after 1000 cycles at a current density of 0.5 A g-1. The straightforward fabrication of the cellulose-based conductive films represented not only a novel scientific approach for supercapacitor-based energy storage materials, but also an emerging area of research aimed at identifying compounds of natural origin and establishing economically efficient routes for the production of environmentally safe (biodegradable) and/or biocompatible devices. This journal is © the Partner Organisations 2014.

Wu Y.,Huazhong Agricultural University | Li W.,Huazhong Agricultural University | Zhang X.,Huazhong Agricultural University | Li B.,Huazhong Agricultural University | And 3 more authors.
Composites Science and Technology | Year: 2014

Graphene oxide, flat carbon nanosheets, has generated extensive interests in many areas of science and engineering due to its unprecedented physical and chemical properties. With the development of wide-scale applicability including facile synthesis and high yield, this exciting material is ready for practical applications. In this work, fully exfoliated graphene oxide nanosheets were introduced into cellulose matrix through a facial pathway. A significant increase in the elongation at break of the composites was observed; that was, a 120% improvement in the tensile strength and a nearly 3 times increase in elongation at break were achieved for the composite films with GO content of 0.27. vol%. The microstructures of the regenerated cellulose films before and after loading of GO nanosheets were characterized by using SEM and TEM. Furthermore, the theoretical simulation from Young's modulus of the composite films indicated that the GO nanosheets had unidirectional arrangement tendency rather than random dispersion in cellulose matrix, which contributed to the improvement in the elongation of the composites, which was supported by the SEM results of the cross-section of the broken composite. © 2014 Elsevier Ltd.

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