Soft, Highly Conductive Nanotube Sponges and Composites with Controlled Compressibility

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• 作者：Xuchun Gui ; Anyuan Cao ; Jinquan Wei ; Hongbian Li ; Yi Jia ; Zhen Li ; Lili Fan ; Kunlin Wang ; Hongwei Zhu ; Dehai Wu
• 刊名：ACS Nano
• 出版年：2010
• 出版时间：April 27, 2010
• 年：2010
• 卷：4
• 期：4
• 页码：2320-2326
• 全文大小：524K
• 年卷期：0
• ISSN：1936-086X

文摘

Porous carbon nanotube networks represent a type of material that can achieve both structural robustness and high flexibility. We demonstrate here controlled synthesis of soft to hard sponges with densities ranging from 5 to 25 mg/cm³, while retaining a porosity of >99%. The stable sponge-like structure allows excellent compressibility tunable up to 90% volume shrinkage, and the ability to recover most of volume by free expansion. Electrical resistivity of the sponges changes linearly and reversibly after 300 cycles of large-strain compression. Nanotubes forming the three-dimensional scaffold maintain good contact and percolation during large-strain deformation, polymer infiltration, and cross-linking process, suggesting potential applications as strain sensors and conductive nanocomposites.