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论文类型：期刊论文

发表时间：2014-12-01

发表刊物：COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING

收录刊物：SCIE、EI

卷号：67

页面范围：1-7

ISSN号：1359-835X

关键字：Foams; Layered structures; Electrical properties; Elasticity

摘要：Porous carbon nanotubes/chitosan (CNTs/CHI) nanocomposites with very low density (similar to 0.02 g/cm(3)) were prepared by ice templating. The produced CNTs/CHI composites possess unidirectionally oriented lamellar structure with uniform layer thickness and channels in submicron and micron scale respectively. Due to this unique microstructure, the CNTs/CHI composites exhibit viscoelastic behavior under compression. With increasing fraction of CNTs, the recovery ability of CNTs/CHI composite increases and achieves the maximum (87% of original length) at a fraction of 0.48 vol.%, and then, decreases due to aggregation of CNTs. In addition, compared to pure chitosan scaffolds, electrical conductivity of CNTs/ CHI composites are dramatically improved up to 8 orders of magnitude. The AC conductivities of CNTs/CHI composites follow the percolation scaling law with percolation threshold p(c) = 0.19 vol.% and scaling exponent t = 1.35. The low value of t = 1.35 suggests a quasi-two dimensional charge transport pathway in the composites. (C) 2014 Elsevier Ltd. All rights reserved.