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Issue 29, 2018
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An asymmetric graphene oxide film for developing moisture actuators

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Although Janus films of different compositions have been commonly utilized to develop moisture actuators due to the different capabilities of swelling in materials, a sole material with a distinct structural design is also able to provide moisture-actuation. In this study, we simply used graphene oxide (GO) to fabricate a sole GO film with an asymmetric structure which consisted of a wavy layer and a smooth layer. Due to the asymmetric structure and excellent hygroscopicity of the GO material, the asymmetric graphene oxide (AGO) film (2.5 × 0.5 cm2) was responsive to moisture and showed a maximum bending angle change of ≈1800° as the relative humidity (RH) changed. Compared with other reports about moisture actuators, the AGO film exhibited a superior bending capability. Furthermore, we propose a novel mechanism for moisture actuation of the AGO film based on our detailed observations, and a wavy structure has been introduced for showing great potential in bending deformation. Finally, the AGO film was used as a grabber to grab a leaf and it exhibited good capability to twine around a plastic rod. This work provides a novel pathway for the development of moisture-responsive materials for potential applications in robotics, artificial muscles and switches.

Graphical abstract: An asymmetric graphene oxide film for developing moisture actuators

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Publication details

The article was received on 02 Mar 2018, accepted on 22 Jun 2018 and first published on 27 Jun 2018

Article type: Paper
DOI: 10.1039/C8NR01785A
Citation: Nanoscale, 2018,10, 14060-14066
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    An asymmetric graphene oxide film for developing moisture actuators

    Y. Qiu, M. Wang, W. Zhang, Y. Liu, Y. V. Li and K. Pan, Nanoscale, 2018, 10, 14060
    DOI: 10.1039/C8NR01785A

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