Gaussian-preserved, non-volatile shape morphing in three-dimensional microstructures for dual-functional electronic devices

Tian, Ziao; Xu, Borui; Wan, Guangchao; Han, Xiaomin; Di, Zengfeng; Chen, Zi; Mei, Yongfeng

doi:10.1038/s41467-020-20843-4

Cited by 23 publications

(36 citation statements)

References 40 publications

(48 reference statements)

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“…Ding et al [71] combined materials (glassy polymer and elastomer) with different thermal expansion coefficients to form a composite rod which was able to transform from a 1D rod to 3D structure. Tian et al [72] reported a Gaussian-preserved shape-morphing system with VO 2 nano-membrane and strip-shaped Cr layer. When the system was stimulated by a force or thermal stimuli, it would transform from 2D flat shape into 3D rolled shape.…”

Section: Strain Mismatchmentioning

confidence: 99%

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Recent Progress in Active Mechanical Metamaterials and Construction Principles

et al. 2021

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Active mechanical metamaterials (AMMs) (or smart mechanical metamaterials) that combine the configurations of mechanical metamaterials and the active control of stimuli-responsive materials have been widely investigated in recent decades. The elaborate artificial microstructures of mechanical metamaterials and the stimulus response characteristics of smart materials both contribute to AMMs, making them achieve excellent properties beyond the conventional metamaterials. The micro and macro structures of the AMMs are designed based on structural construction principles such as, phase transition, strain mismatch, and mechanical instability. Considering the controllability and efficiency of the stimuli-responsive materials, physical fields such as, the temperature, chemicals, light, electric current, magnetic field, and pressure have been adopted as the external stimuli in practice. In this paper, the frontier works and the latest progress in AMMs from the aspects of the mechanics and materials are reviewed. The functions and engineering applications of the AMMs are also discussed. Finally, existing issues and future perspectives in this field are briefly described. This review is expected to provide the basis and inspiration for the follow-up research on AMMs.

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Section: Strain Mismatchmentioning

confidence: 99%

“…Tian et al. [ 72 ] reported a Gaussian‐preserved shape‐morphing system with VO 2 nano‐membrane and strip‐shaped Cr layer. When the system was stimulated by a force or thermal stimuli, it would transform from 2D flat shape into 3D rolled shape.…”

Section: Construction Principle For Active Mechanical Metamaterialsmentioning

confidence: 99%

Recent Progress in Active Mechanical Metamaterials and Construction Principles

et al. 2021

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“…46 Besides these two-dimensional (2D) flexible VO 2 electronic devices, a novel 3-dimensional (3D) VO 2 -based dual-functional electronic device has been reported recently. 47 As shown in Figure 4I, the two-terminal devices are composed of two Cr electrodes on the VO 2 nanomembrane, where the electrode was designed with the width of 10 μm separated by a gap of 20 μm. Two shapes (rolled shape as shape I and folded shape as shape II) can be both formed, while the relevant SEM images have been shown.…”

Section: Flexible Vo 2 Electronicsmentioning

confidence: 99%

Multifunctional Flexible Vanadium Dioxide Films

et al. 2021

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Conspectus As a typical phase transition material, vanadium dioxide (VO2) has attracted much attention due to its amazing metal–insulator transition (MIT) at the critical temperature of 68 °C, which could be driven by multiple stimuli, including electricity, thermal irradiation, THz waves, strain, etc. In the MIT process, VO2 exhibits significant changes in its structure from monoclinic structure at low temperature to rutile structure at high temperature, accompanied by significant modulation of physical properties, such as the infrared transmittance from high to low and a resistivity drop over 5 magnitudes. Based on these features, VO2 has functioned as thermochromic coatings, sensors, switches, electronic devices, actuators, etc. However, the vanadium element possesses multiple valent states and can produce complicated thermodynamics of vanadium oxides. The fabrication of tetravalence VO2 with desirable phase-transition features usually requires rigorous fabrication conditions with a precisely controlled atmosphere for stoichiometric components and high temperatures for good crystallinity. Under these circumstances, it is difficult to directly fabricate crystalline VO2 films on flexible polymer substrates because most of them could not stand such high temperatures (usually >400 °C), which will lead to the loss of the substrate functionality. However, the featured phase transition of VO2 makes it a promising candidate for future flexible devices, while VO2 owns great potential as flexible optical coatings, flexible sensors, flexible electronics, etc. Hence, research on flexible VO2 films is necessary and could largely pave the way to the application field of VO2 material. In this Account, we start with a brief introduction to phase transition properties of VO2 to reveal the intrinsic advantages as key materials in flexible devices. Next, multifunctional devices based on flexible VO2 films with different forms and characteristics are presented, including (1) flexible VO2-film-based thermochromic smart windows for energy-saving function depending on the change of environmental temperatures, (2) flexible VO2 films optical devices based on the changing emissivity of VO2, (3) flexible VO2 films with compatibility as multifunctional sensors, (4) next-generation flexible electronics based on VO2 films, and (5) flexible VO2 actuators with significant mechanical motions under external stimuli. Meanwhile, various fabrication technologies of flexible VO2 films have been introduced and discussed. Finally, we end the Account with an overview of the remaining challenges and new opportunities that have been opened up for vanadium dioxide in new forms of flexible optical and electronic devices. We hope this Account will inspire new innovative designs, fabrication approaches, and more possible functions of flexible VO2 films in future work.

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“…[ 52,54,55 ] In the context of the metal‐dominated failure mode, the neutral‐mechanical‐plane design was adopted to reduce the stress level in metal layers, which could improve substantially the fatigue life of serpentine ribbons under the cyclic tension. [ 48,56–60 ] However, these works mainly focused on the fatigue failure of planar ribbon‐shaped geometries, [ 47,49,61,62 ] noting that anti‐fatigue designs addressing 3D ribbon‐shaped device configurations [ 44,63 ] are still lacking. Additionally, the application of the neutral‐mechanical‐plane design could be limited in some scenarios.…”

Section: Introductionmentioning

confidence: 99%

An Anti‐Fatigue Design Strategy for 3D Ribbon‐Shaped Flexible Electronics

Zhang

et al. 2021

Advanced Materials

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Three‐dimensional (3D) flexible electronics represent an emerging area of intensive attention in recent years, owing to their broad‐ranging applications in wearable electronics, flexible robots, tissue/cell scaffolds, among others. The widely adopted 3D conductive mesostructures in the functional device systems would inevitably undergo repetitive out‐of‐plane compressions during practical operations, and thus, anti‐fatigue design strategies are of great significance to improve the reliability of 3D flexible electronics. Previous studies mainly focused on the fatigue failure behavior of planar ribbon‐shaped geometries, while anti‐fatigue design strategies and predictive failure criteria addressing 3D ribbon‐shaped mesostructures are still lacking. This work demonstrates an anti‐fatigue strategy to significantly prolong the fatigue life of 3D ribbon‐shaped flexible electronics by switching the metal‐dominated failure to desired polymer‐dominated failure. Combined in situ measurements and computational studies allow the establishment of a failure criterion capable of accurately predicting fatigue lives under out‐of‐plane compressions, thereby providing useful guidelines for the design of anti‐fatigue mesostructures with diverse 3D geometries. Two mechanically reliable 3D devices, including a resistance‐type vibration sensor and a janus sensor capable of decoupled temperature measurements, serve as two demonstrative examples to highlight potential applications in long‐term health monitoring and human‐like robotic perception, respectively.

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Gaussian-preserved, non-volatile shape morphing in three-dimensional microstructures for dual-functional electronic devices

Cited by 23 publications

References 40 publications

Recent Progress in Active Mechanical Metamaterials and Construction Principles

Recent Progress in Active Mechanical Metamaterials and Construction Principles

Multifunctional Flexible Vanadium Dioxide Films

An Anti‐Fatigue Design Strategy for 3D Ribbon‐Shaped Flexible Electronics

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