Biomimetic Graphene Actuators Enabled by Multiresponse Graphene Oxide Paper with Pretailored Reduction Gradient

The strong interaction between water molecules and graphene oxide (GO) enables moisture‐responsive graphene actuators, revealing great potential for soft robots. However, current strategies for developing smart graphene actuators fail to tailor their material property gradient in a controlled manner, and the driving manner is usually limited to single stimulus actuation. Here, a facile preparation of humidity/thermal/light multiresponsive graphene actuators by sequential vacuum filtration of GO and reduced GO (RGO) aqueous solutions is reported. The photoreduction degree of RGO layer is tuned precisely beforehand by changing ultraviolet (UV) light irradiation time, and thus a pretailored reduction gradient along the normal direction of the GO/RGO bilayer paper would form in a highly controlled manner. Taking advantage of the competitive water adsorption between the GO and RGO layers, as well as the thermal‐, light‐promoted desorption, the GO/RGO bilayers deform in response to moisture, light, and temperature changes; and the deformation degree can be modulated by controlling the gradient of oxygen‐containing groups (OCGs). As a proof of principle, a humidity‐responsive graphene mimosa and a humidity/thermal/light multiresponsive graphene actuators are fabricated. The GO/RGO bilayer paper with pretailored reduction gradient holds great promise for easy fabrication of biomimetic actuators that enable performing predictable deformation.

[1]  M. Lobino,et al.  Laser‐Reduced Graphene: Synthesis, Properties, and Applications , 2018 .

[2]  G. Hadziioannou,et al.  All inkjet-printed piezoelectric electronic devices: energy generators, sensors and actuators , 2017 .

[3]  Yong‐Lai Zhang,et al.  Sunlight‐Reduced Graphene Oxides as Sensitive Moisture Sensors for Smart Device Design , 2017 .

[4]  S. Huang,et al.  Edge effect of strained bilayer nanofilms for tunable multistability and actuation. , 2017, Nanoscale.

[5]  Hong-Bo Sun,et al.  Light‐Mediated Manufacture and Manipulation of Actuators , 2016, Advanced materials.

[6]  Lawrence T. Campbell,et al.  Echoes of photons past , 2016, Nature Photonics.

[7]  Saulius Juodkazis,et al.  Ultrafast laser processing of materials: from science to industry , 2016, Light: Science & Applications.

[8]  Lan Jiang,et al.  Highly efficient moisture-enabled electricity generation from graphene oxide frameworks , 2016 .

[9]  Y. Liu,et al.  Laser‐Directed Assembly of Aligned Carbon Nanotubes in Three Dimensions for Multifunctional Device Fabrication , 2016, Advanced materials.

[10]  Hong-Bo Sun,et al.  Bioinspired Graphene Actuators Prepared by Unilateral UV Irradiation of Graphene Oxide Papers , 2015 .

[11]  Luke P. Lee,et al.  Ultrafast photonic PCR , 2015, Light: Science & Applications.

[12]  Masakazu Aono,et al.  Nanoarchitectonics: a new materials horizon for nanotechnology , 2015 .

[13]  Luke P. Lee,et al.  Bioinspired optical antennas: gold plant viruses , 2015, Light: Science & Applications.

[14]  Jie Zhang,et al.  Hierarchical Composite Electrodes of Nickel Oxide Nanoflake 3D Graphene for High‐Performance Pseudocapacitors , 2014 .

[15]  Yong‐Lai Zhang,et al.  Bioinspired Fabrication of Superhydrophobic Graphene Films by Two‐Beam Laser Interference , 2014 .

[16]  Hye Rin Kwag,et al.  Stimuli-responsive theragrippers for chemomechanical controlled release. , 2014, Angewandte Chemie.

[17]  L. Qu,et al.  Moisture‐Activated Torsional Graphene‐Fiber Motor , 2014, Advanced materials.

[18]  Jianzhao Li,et al.  Quantized structuring of transparent films with femtosecond laser interference , 2014, Light: Science & Applications.

[19]  I. V. Grigorieva,et al.  Precise and Ultrafast Molecular Sieving Through Graphene Oxide Membranes , 2014, Science.

[20]  Eunkyoung Kim,et al.  NIR‐Sensitive Poly(3,4‐ethylenedioxyselenophene) Derivatives for Transparent Photo‐Thermo‐Electric Converters , 2013, Advanced materials.

[21]  Lan Jiang,et al.  Graphene fibers with predetermined deformation as moisture-triggered actuators and robots. , 2013, Angewandte Chemie.

[22]  Hidenori Okuzaki,et al.  Humidity‐Sensitive Polypyrrole Films for Electro‐Active Polymer Actuators , 2013 .

[23]  M. Dresselhaus,et al.  Ultrahigh humidity sensitivity of graphene oxide , 2013, Scientific Reports.

[24]  Hidenori Okuzaki,et al.  Humido-sensitive conducting polymer films and applications to linear actuators , 2013 .

[25]  Eunkyoung Kim,et al.  Noninvasive photodetachment of stem cells on tunable conductive polymer nano thin films: selective harvesting and preserved differentiation capacity. , 2013, ACS nano.

[26]  D. Gracias.  Stimuli responsive self-folding using thin polymer films , 2013 .

[27]  A. Kalloo,et al.  Biopsy with Thermally‐Responsive Untethered Microtools , 2013, Advanced materials.

[28]  James M Tour,et al.  Graphene oxide. Origin of acidity, its instability in water, and a new dynamic structural model. , 2013, ACS nano.

[29]  L. Dai,et al.  Directional scrolling of SiGe/Si/Cr nanoribbon on Si(111) surfaces controlled by two-fold rotational symmetry underetching. , 2013, Nanoscale.

[30]  M. Aono,et al.  Forming nanomaterials as layered functional structures toward materials nanoarchitectonics , 2012 .

[31]  P. Prasad,et al.  Feature issue introduction: quantum dots for photonic applications. , 2012, Optics express.

[32]  Evin Gultepe,et al.  Self-folding devices and materials for biomedical applications. , 2012, Trends in biotechnology.

[33]  M. Jamal,et al.  Differentially photo-crosslinked polymers enable self-assembling microfluidics. , 2011, Nature communications.

[34]  R. Ruoff,et al.  Hydrogen bond networks in graphene oxide composite paper: structure and mechanical properties. , 2010, ACS nano.

[35]  Hidenori Okuzaki,et al.  Electromechanical properties of poly(3,4-ethylenedioxythiophene)/poly(4-styrene sulfonate) films. , 2009, The journal of physical chemistry. B.

[36]  C. Betty,et al.  Room temperature gas sensitivity of ultrathin SnO2 films prepared from Langmuir-Blodgett film precursors , 2006 .

[37]  Li Zhang,et al.  Anomalous coiling of SiGe/Si and SiGe/Si/Cr helical nanobelts. , 2006, Nano letters.

[38]  Hong-Bo Sun,et al.  Moisture‐Responsive Graphene Paper Prepared by Self‐Controlled Photoreduction , 2015, Advanced materials.

[39]  Thomas C. Hull,et al.  Programming Reversibly Self‐Folding Origami with Micropatterned Photo‐Crosslinkable Polymer Trilayers , 2015, Advanced materials.

[40]  D. Gracias,et al.  Microchemomechanical Systems , 2011 .