Maximizing the performance of photothermal actuators by combining smart materials with supplementary advantages

Wang, Tongyu; Torres, David; Fernández, Félix E.; Wang, Chuan; Sepúlveda, Nelson

doi:10.1126/sciadv.1602697

Cited by 94 publications

(90 citation statements)

References 39 publications

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“…Thus, the drastic, reversible phase transition of VO 2 drives the actuators to deliver a giant amplitude, fast response up to ≈100 Hz, and long lifetime of more than 1 × 10 6 actuation cycles. As shown in Figure c, a high‐performance photothermal microactuator was reported by Wang et al in 2017 . The inset in Figure c shows that a single‐walled carbon nanotube (SWNT) layer, with a thickness of 100 nm, was coated on a VO 2 NM.…”

Section: Applicationsmentioning

confidence: 90%

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Inorganic Stimuli‐Responsive Nanomembranes for Small‐Scale Actuators and Robots

Tian

Wang

Chen

et al. 2020

Advanced Intelligent Systems

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The term small‐scale robotics describes a wide variety of miniature robotic systems, ranging from millimeter‐sized devices down to autonomous mobile systems with dimensions measured in nanometers. These systems can perform complex tasks that are impossible for humans to accomplish or at scales that humans cannot reach. In recent years, the rapid advancement of small‐scale robotics has benefited from the progress in synthesis and nanotechnology, providing access to nanomembranes with stimuli‐responsive materials, such as phase transition materials, shape memory alloys, and palladium. These materials are 2D sheets with a thickness ranging from 5 to 500 nm, and they have the ability to change their shape reversibly under extremal stimuli. Together with strain engineering for deterministic assembly, various stimuli‐responsive actuators and robots have been fabricated for medicine, manufacturing, and exploration by endowing them with the combined features of a continuously deformable structure, remote operation, and several degrees of freedom. Herein, the recent achievements in small‐scale actuators and robots based on inorganic stimuli‐responsive nanomembranes are reviewed and their advantages and properties highlighted.

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Section: Applicationsmentioning

confidence: 90%

Section: Applicationsmentioning

confidence: 99%

Inorganic Stimuli‐Responsive Nanomembranes for Small‐Scale Actuators and Robots

Tian

Wang

Chen

et al. 2020

Advanced Intelligent Systems

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“…Wang et al further discovered that the time response of photothermal actuators could be limited by the speed of the photothermal process instead of the mechanical properties of the fabricated device, since the process converting absorbed energy to heat is slower than the mechanical actuation process . A model was developed for estimating the time response based on the finite element method (FEM) created in COMSOL with the physics of “Heat Transfer” and “Solid Mechanics.” First, a temperature dependent thermal expansion coefficient α( T ) was introduced in Equation to describe the phase transition of VO 2 , while the anchor temperature was set at 40 °C

α (T) = \frac{6 \times 10^{- 6}}{1 + {normale}^{- 0.2 (T - 226.15)}} - 3 \times 10^{- 8} (T - 273.15) + 6.9 \times 10^{- 6}

…”

Section: Actuating Schemes For Light‐to‐work Conversionmentioning

confidence: 99%

Photoresponsive Actuators Built from Carbon‐Based Soft Materials

Yang

Yuan

Liu

et al. 2019

Advanced Optical Materials

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Actuations triggered by light strongly depend on the energy density of light, energy conversion efficiency and actuator dimensions. Therefore, understanding the energy-conversion routes is crucial for effective photoresponsive actuations. As illustrated in Table 1, several actuating schemes have been demonstrated in carbon-based soft materials, including indirect light-to-work-conversion with heat energy, electric energy and chemical energy introduced as intermediate energy sources and

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“…Below the MIT temperature ( T MIT ), VO 2 is semiconductor with a monoclinic structure (M1, space group P 2 1 / c ), whereas above the temperature T MIT , VO 2 is in the metallic state with rutile‐tetragonal structure (R, space group P 4 2 /mnm) . The abrupt change in electrical makes VO 2 an important material for device applications, especially for the ultrafast phase transition in advanced electronics and optoelectronics, such as sensors, electrical and thermal switches field‐effect transistors, spintronic devices, and thermal actuators …”

Section: Introductionmentioning

confidence: 99%

Bandwidth controlled metal‐insulator transition in Au–VO₂ nanocomposite thin films

Ning

Chen

et al. 2018

J Am Ceram Soc

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Recognizing and controlling the metal-insulator transition (MIT) in VO 2 transition-metal oxides is interesting for the future electronic devices. However, the effect of the electron correlation for the structure-coupled MIT in VO 2 is as yet an open question. In this study, we present for the first time direct spectroscopic evidence for the charge-transfer assistance bandwidth controlled MIT (BC-MIT) in Au-VO 2 nanocomposite thin films (NCTFs). A significantly enhancement of the MIT temperature (about 350 K) is realized in Au-VO 2 films with Au volume ratio of 1.1 mol%. However, by further increasing Au ratios, the MIT temperature in Au-VO 2 NCTFs is downward shifted by~16 K and forward shifted 6 K. The V L-edge and O K-edge have been investigated. The basic electronic parameters such as the covalency (W) have been tuned. The relationship between bandwidth and the MIT temperature has been clearly elucidated a linear relationship. The experimental results demonstrate that MIT in VO 2 is BC-MIT which improved our understanding of the electron correlation effect in VO 2 systems. K E Y W O R D Sbandwidth, metal-insulator transition, vanadium dioxide

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Maximizing the performance of photothermal actuators by combining smart materials with supplementary advantages

Abstract: This study demonstrates the use of light colors to selectively actuate micrometer-sized structures.

Cited by 94 publications

References 39 publications

Inorganic Stimuli‐Responsive Nanomembranes for Small‐Scale Actuators and Robots

Inorganic Stimuli‐Responsive Nanomembranes for Small‐Scale Actuators and Robots

Photoresponsive Actuators Built from Carbon‐Based Soft Materials

Bandwidth controlled metal‐insulator transition in Au–VO₂ nanocomposite thin films

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Maximizing the performance of photothermal actuators by combining smart materials with supplementary advantages

Abstract: This study demonstrates the use of light colors to selectively actuate micrometer-sized structures.

Cited by 94 publications

References 39 publications

Inorganic Stimuli‐Responsive Nanomembranes for Small‐Scale Actuators and Robots

Inorganic Stimuli‐Responsive Nanomembranes for Small‐Scale Actuators and Robots

Photoresponsive Actuators Built from Carbon‐Based Soft Materials

Bandwidth controlled metal‐insulator transition in Au–VO2 nanocomposite thin films

Contact Info

Product

Resources

About

Bandwidth controlled metal‐insulator transition in Au–VO₂ nanocomposite thin films