College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China.
College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China.
Carbohydr Polym. 2015 Dec 10;134:309-13. doi: 10.1016/j.carbpol.2015.08.004. Epub 2015 Aug 6.
We reported a highly conductive nanocomposite made with multiwalled carbon nanotubes (MWCNTs) and chitin nanofibers (ChNFs). The MWCNTs were dispersed into ChNFs by the simple process of vacuum-filtration, forming a three-dimensional network structure. In this approach, MWCNT acted as a filler to introduce electron channel paths throughout the ChNF skeleton. And then, a hybrid hydrogel system (20 wt.% NaOH, -18 °C) was applied to prepare the ChNF/MWCNT gel-film followed with drying process. It is found that the resultant ChNF/MWCNT gel-film exposed much more MWCNT areas forming denser structure due to the shrinking of ChNFs after the gelation treatment. Compared with ChNF/MWCNT film, the one treated under hydrogel system (ChNF/MWCNT gel-film) exhibited almost twice higher conductivity (9.3S/cm for 50 wt.% MWCNTs in gel-film; whereas 4.7S/cm for 50 wt.% MWCNTs in film). Moreover, the facile and low-cost of this conductive paper may have great potential in development of foldable electronic devices.
我们报道了一种由多壁碳纳米管（MWCNTs）和壳聚糖纳米纤维（ChNFs）制成的高导电纳米复合材料。MWCNTs 通过简单的真空过滤过程分散到 ChNFs 中，形成了三维网络结构。在这种方法中，MWCNT 充当了填充剂，在 ChNF 骨架中引入了电子通道。然后，应用混合水凝胶体系（20wt.%NaOH，-18°C）制备 ChNF/MWCNT 凝胶薄膜，随后进行干燥处理。结果发现，由于凝胶化处理后 ChNFs 的收缩，所得的 ChNF/MWCNT 凝胶薄膜暴露了更多的 MWCNT 区域，形成了更致密的结构。与 ChNF/MWCNT 薄膜相比，在水凝胶体系（ChNF/MWCNT 凝胶薄膜）处理的薄膜表现出近两倍的高导电性（凝胶薄膜中 50wt.%MWCNTs 的电导率为 9.3S/cm，而薄膜中 50wt.%MWCNTs 的电导率为 4.7S/cm）。此外，这种导电纸的制备方法简单且成本低，可能在可折叠电子设备的开发方面具有巨大的潜力。
