Recent Advances in Photoactuators and Their Applications in Intelligent Bionic Movements

Li, Jingjing; Zhou, Xiang; Liu, Zunfeng

doi:10.1002/adom.202000886

Cited by 60 publications

(34 citation statements)

References 144 publications

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“…It is believed that MA organic structure in the tetragonal MAPbI 3 crystals exhibits an order‐disorder phase transition which introduces a nonzero but small electric polarization, leading to the formation of polar nanodomains. [ 41–46 ] These local polarized regions would be very helpful for suppressing the carrier scattering. Similar scenarios were once proposed by Zhu et al., and it was believed that the screened Coulomb potential created by large polarons in the crystal can reduce the carrier scattering by charged defects and phonons.…”

Section: Resultsmentioning

confidence: 99%

Giant Bulk Photostriction and Accurate Photomechanical Actuation in Hybrid Perovskites

Dong

Huang

et al. 2021

Advanced Optical Materials

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It is well known that a material may be strained by mechanical, thermal, electric, magnetic, and light stimuli, and this effect has been extensively utilized in industries. However, the observed photostrictive effect usually occurs in the very thin surface layer and the photostriction of most bulk materials has been too small to be applied in a device until now. Here, a giant bulk photostriction is achieved, evidenced by the measured linear strain ε ≈ 0.72–0.43% for MAPbI3 single crystal plates of 0.05–0.5 mm in thickness under the 532 nm illumination. More importantly, the MAPbI3 single crystals also exhibit accurate photomechanical actuation functionality and the actuator can precisely adjust the displacement from hundreds of pm to tens of μm or the angle of a hard mirror from ≈10−6 to 0.2 degree. The present work not only unveils the huge bulk photostriction in lead halide perovskite single crystals but also demonstrates a wireless photomechanical actuator which is much simpler and smaller than conventional piezoelectric actuators.

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Section: Resultsmentioning

confidence: 99%

Giant Bulk Photostriction and Accurate Photomechanical Actuation in Hybrid Perovskites

Dong

Huang

et al. 2021

Advanced Optical Materials

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“…While most actuators rely on pneumatic or electric systems tethered to external pumps or circuits, light‐driven actuators have attracted significant attention because of their unique feature of remote control. [ 77 ] To convert photon energy to mechanical deformations, photoactive agents, such as photothermal materials (e.g., nanoparticles or organic dyes) and photochemical switches (e.g., azobenzene‐based molecules), are needed. Photons emitted by a light source and absorbed by a photoactive agent may produce mechanical motions by 1) photothermal expansion; [ 78,79 ] 2) conformational change; [ 80,81 ] or 3) phase transition (e.g., glass transition of shape‐memory materials, [ 82,83 ] nematic‐isotropic transition of liquid crystals, [ 84,85 ] and hydrophilic–hydrophobic transition of hydrogels.…”

Section: Plasmonic Nanostructures Tailored For Specific Applicationsmentioning

confidence: 99%

Plasmonic Nanostructures for Photothermal Conversion

et al. 2021

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The nonradiative conversion of light to heat by plasmonic nanostructures, the so‐called plasmonic photothermal effect, has attracted enormous attention due to their widespread potential applications. Herein, the perspectives on the design and preparation of plasmonic nanostructures for light to heat or photothermal conversion are provided. The general principle of plasmonic photothermal conversion is first introduced, and then, the strategies for improving efficiency are discussed, which is the focus of this field. Then, five typical application types are used, including solar energy harvesting, photothermal actuation, photothermal therapy, laser‐induced color printing, and high‐temperature photothermal devices, to elucidate how to tailor the nanomaterials to meet the requirements of these specific applications. In addition to the photothermal effect, other unique physical and chemical properties are coupled to further explore the application scenarios of plasmonic photothermal materials. Finally, a summary and the perspectives on the directions that may lead to the future development of this exciting field are also given.

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“…Among them, light-driven actuators, i.e. photoactuators, have attracted particular research interest due to the advantages of light, such as immunity of electromagnetic interference, safe operation in explosive atmosphere and exible tunability in wavelengths, intensity and polarization [23][24][25][26][27] .…”

Section: Introductionmentioning

confidence: 99%

Optical fibre taper-enabled waveguide photoactuators

Xiao

Zhou²,

et al. 2021

Preprint

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Photoactuators have attracted tremendous interest yet most of them rely on free-space illumination, which requires a line-of-site low-loss optical path. While waveguide photoactuators can overcome this limitation, their actuating performances are fundamentally restricted by the nature of standard optical fibres. Herein, we demonstrated miniature photoactuators by embedding optical fibre taper (OFT) in a polydimethylsiloxane/Au nanorod-graphene oxide photothermal film. The special geometric features of OFT endow the OFT photoactuator (OPA) with microscale active layer thickness, high energy density and optical coupling efficiency. Hence, OPAs show large bending angles (> 270°), fast response (1.8 s for 180° bending), and low energy consumption (< 0.55 mW/°), significantly exceeding the performance of state-of-the-art waveguide photoactuators. As a proof-of-concept study, biomimetic chameleon tail and tongue are realized. A two-arm soft gripper is further demonstrated for capturing/moving small objects, which is challenging for free-space light-driven photoactuators. This study hopes to pave the way toward a new category of photoactuators.

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Recent Advances in Photoactuators and Their Applications in Intelligent Bionic Movements

Cited by 60 publications

References 144 publications

Giant Bulk Photostriction and Accurate Photomechanical Actuation in Hybrid Perovskites

Giant Bulk Photostriction and Accurate Photomechanical Actuation in Hybrid Perovskites

Plasmonic Nanostructures for Photothermal Conversion

Optical fibre taper-enabled waveguide photoactuators

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