Supramolecular ionic polymer/carbon nanotube composite hydrogels with enhanced electromechanical performance

Yunfei Zhang, Feipeng Du (Corresponding Author), Ling Chen, Ka Wai Yeung, Yuqing Dong, Wing Cheung Law, Chi Pong Tsui, Chak Yin Tang (Corresponding Author)

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)


Electroactive hydrogels have received increasing attention due to the possibility of being used in biomimetics, such as for soft robotics and artificial muscles. However, the applications are hindered by the poor mechanical properties and slow response time. To address these issues, in this study, supramolecular ionic polymer–carbon nanotube (SIPC) composite hydrogels were fabricated via in situ free radical polymerization. The polymer matrix consisted of carbon nanotubes (CNTs), styrene sulfonic sodium (SSNa), β-cyclodextrin (β-CD)-grafted acrylamide, and ferrocene (Fc)-grafted acrylamide, with the incorporation of SSNa serving as the ionic source. On applying an external voltage, the ions accumulate on one side of the matrix, leading to localized swelling and bending of the structure. Therefore, a controllable and reversible actuation can be achieved by changing the applied voltage. The tensile strength of the SIPC was improved by over 300%, from 12 to 49 kPa, due to the reinforcement effect of the CNTs and the supramolecular host–guest interactions between the β-CD and Fc moieties. The inclusion of CNTs not only improved the tensile properties but also enhanced the ion mobility, which lead to a faster electromechanical response. The presented electro-responsive composite hydrogel shows a high potential for the development of robotic devices and soft smart components for sensing and actuating applications.
Original languageEnglish
Pages (from-to)478-488
Number of pages11
JournalNanotechnology Reviews
Issue number1
Publication statusPublished - 30 May 2020


  • composite hydrogel
  • electro-mechanical performance
  • single-walled carbon nanotube
  • supramolecular ionic polymer

ASJC Scopus subject areas

  • Biotechnology
  • Medicine (miscellaneous)
  • Materials Science (miscellaneous)
  • Energy Engineering and Power Technology
  • Engineering (miscellaneous)
  • Process Chemistry and Technology


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