4.8 Article

A small graphene oxide sheet/polyvinylidene fluoride bilayer actuator with large and rapid responses to multiple stimuli

Journal

NANOSCALE
Volume 9, Issue 44, Pages 17465-17470

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr07116g

Keywords

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Funding

  1. National Natural Science Foundation of China [21274074, 51433005]
  2. National Basic Research Program of China [2013CB93301]
  3. MOST [2016YFA0200200]

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A high-performance actuator should be able to deliver large-shape deformations, fast actuations and sensitive responses to multiple stimuli. Here, we report such an actuator constructed from one layer of polyvinylidene fluoride (PVDF) with a high coefficient of thermal expansion (CTE), and another layer of small sheets of graphene oxide (SGO) with a negative CTE. The opposite deformations of both actuation layers make the SGO/PVDF bilayer actuator highly sensitive to the temperature stimulus with a large bending sensitivity of 1.5 cm(-1) degrees C-1. Upon irradiation with 60 mW cm(-2) infrared light, this SGO/PVDF bilayer actuator displayed an extremely rapid tip displacement rate of 140 mm s(-1). Furthermore, this actuator can also sensitively respond to moisture because of its SGO layer, showing a curvature change from -22 to 13 cm(-1) upon changing the relative humidity (RH) from 11% to 86%. This actuator can generate a contractile or relaxed stress 18 times that of mammalian skeletal muscle, under light irradiation or moisture with a response time as short as 1 s, being capable of lifting an object with a weight 80 times that of itself. Furthermore, it also showed excellent stability and repeatability.

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