Joule heating driven infrared switching in flexible VO<sub>2</sub> nanoparticle films with reduced energy consumption for smart windows

Shi, Nan; Shi, Chen; Wang, Weijun; Shi, Run; Chen, Pengcheng; Kong, De‐Xing; Liang, Yuxing; Amini, Abbas; Wang, Jianbo

doi:10.1039/c8ta11071a

Cited by 53 publications

(33 citation statements)

References 54 publications

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“…To examine the performance limit of this device, a cantilevered belt was cropped from as-obtained VO 2 NA/CNT bimorph along the axial direction of the VO 2 NA film. The temperature-dependent actuation of device shown in Figure 2b reflects a typical hysteresis loop (window width of %15 C) at %65 C, that is commonly observed in other VO 2 -based devices, [28,29] matches well with the DSC curves of annealed VO 2 NWs (Section S5, Supporting Information). This featured loop and characteristic working temperature range verify that the driving mechanism of the actuator is the MIT of VO 2 rather than the thermal expansion mismatch between VO 2 and CNT films.…”

Section: Resultssupporting

confidence: 74%

Multistimuli‐Responsive Insect‐Scale Soft Robotics Based on Anisotropic Super‐Aligned VO₂ Nanowire/Carbon Nanotube Bimorph Actuators

Chen

Shi

et al. 2020

Advanced Intelligent Systems

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The emerging soft robots have attracted increasing interests and gotten rapidly developed, but it is still challenging to substantially promote their response speed and work density. In addition, the wireless way to conveniently trigger the devices, especially for the centimeter‐scale ones, is highly desired. Herein, the multistimuli‐responsive insect‐scale soft robotics is reported based on a super‐aligned VO2 nanowire arrays (NAs)/carbon nanotube (CNT) bimorph film, comprehensively addressing aforementioned problems. The as‐prepared VO2 NA/CNT bimorph shows improved actuation performance, anisotropic behavior, rapid response to various stimuli (heat, light, and electricity), and multiple movement modes (bending and torsion). Consequently, diverse untethered, insect‐scale soft robots, serving as biomimetic crawler, lifter, gripper, wing of flying robots, torsional robot, and so on are successfully demonstrated. The findings provide an effective strategy to develop high‐performance macroscopic mechanical devices by assembling functional nanostructures.

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Section: Resultssupporting

confidence: 74%

Multistimuli‐Responsive Insect‐Scale Soft Robotics Based on Anisotropic Super‐Aligned VO₂ Nanowire/Carbon Nanotube Bimorph Actuators

Chen

Shi

et al. 2020

Advanced Intelligent Systems

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“…1,25 Problematically, heterogeneous interior structure made by classical synthesis results in high turbidity of the composite at room temperature. 26 extremely lower than that in other similar reports 1,22 . The involved mechanism for the performance improvement will be discussed later.…”

Section: Introductioncontrasting

confidence: 59%

“…NPs in the VSP hydrogel plays an important role for enhancing the transmittance of sunlight and solar modulating ability. Particularly, the content of inorganic NPs used in this work was extremely lower than that in other similar reports 1,22 . The involved mechanism for the performance improvement will be discussed later.…”

Section: Resultsmentioning

confidence: 54%

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Energy-Efficient Smart Window Based on Thermochromic Hydrogel with Ultrahigh Visible Transparency and Unprecedented Infrared Transmittance Modulation

Zhang¹,

Xiang²,

Feng³

et al. 2021

Preprint

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Both high visible transparency and strong solar modulating ability are highly required for energy-saving smart windows, but conventional responsive materials usually have low transparency and narrow solar transmittance range. Herein, we report a significant advance toward the design and fabrication of responsive smart windows by trapping novel V0.8W0.2O2@SiO2 doped poly(N-isopropyl acrylamide) (PNIPAm) thermochromic liquid hydrogel within two glass panels. The smart window is highly transparent to allow solar transmittance at low temperatures, while turns opaque automatically to cut off solar energy gain when exposed in sunlight. With a remarkably low content (1.0wt‰) of dopant, V0.8W0.2O2@SiO2/PNIPAm (VSP) hydrogels exhibit ultrahigh luminous transmittance Tlum of 92.48% and solar modulation ∆Tsol of 77.20%. The superior performance is mainly attributed to that V0.8W0.2O2@SiO2 doping induces PNIPAm particles’ size reduction and internal structure change. W-doping decreases the phase transition temperature (Tc) of VO2 from 68 ºC to ~30 ºC (close to the Tc of PNIPAm), contributing to an unprecedented infrared transmittance modulation. Especially, the smart window shows excellent energy-saving during daytime outdoor demonstrations where practically achievable cooling temperature reaches up to 15.1 ºC. In addition, the smart window exhibits outstanding stability, as embodied by unchanged optical performance even after 100 transparency-opaqueness reversible cycles. This new type of thermochromic hydrogel offering unique advantages of shape-independence, scalability together with soundproof functionality promises potential applications in energy-saving buildings and greenhouses.

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“…73 In fact, several efforts have been applied to the transition modulation, which can be generally divided into two types. In the first type, VO 2 films were grown on transparent conductive substrate (e.g., indium tin oxide [ITO], 74 carbon nanotubes 75 ), whereby the flowing current can generate Joule heat and drive the MIT of VO 2 . In this situation, due to the hysteresis behavior of VO 2 films, the maximum infrared switching ability can be sustained with dramatically reduced power, as shown in Figures 4A and 4B 74 .…”

Section: Multistate Modulationmentioning

confidence: 99%

Challenges and Opportunities toward Real Application of VO2-Based Smart Glazing

Cao

Chang

Shao

et al. 2020

Matter

110

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Vanadium dioxide (VO 2 ) shows great potential as next-generation smart glazing for architecture owing to its automatic thermochromic effect depending on environmental temperatures. Besides widely studied aspects such as phasetransition temperature, luminous transmittance, and solar-modulation ability, there emerge several novel but necessary challenges of VO 2 -based smart glazing for real-world applications, including color modulation, multistate modulation, skin-comfort design, flexible fabrication, improved stability, and environmental friendliness. These challenges also bring about opportunities for VO 2 -based smart glazing. This review investigates the challenges and opportunities of VO 2 -based smart glazing that may be beneficial in accelerating the realization of real-world applications.

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Joule heating driven infrared switching in flexible VO₂ nanoparticle films with reduced energy consumption for smart windows

Abstract: Hysteresis behaviour of metal–insulator transition in VO2 enables reduced energy consumption for high-performance Joule heating driven flexible smart windows.

Cited by 53 publications

References 54 publications

Multistimuli‐Responsive Insect‐Scale Soft Robotics Based on Anisotropic Super‐Aligned VO₂ Nanowire/Carbon Nanotube Bimorph Actuators

Multistimuli‐Responsive Insect‐Scale Soft Robotics Based on Anisotropic Super‐Aligned VO₂ Nanowire/Carbon Nanotube Bimorph Actuators

Energy-Efficient Smart Window Based on Thermochromic Hydrogel with Ultrahigh Visible Transparency and Unprecedented Infrared Transmittance Modulation

Challenges and Opportunities toward Real Application of VO2-Based Smart Glazing

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Joule heating driven infrared switching in flexible VO2 nanoparticle films with reduced energy consumption for smart windows

Abstract: Hysteresis behaviour of metal–insulator transition in VO2 enables reduced energy consumption for high-performance Joule heating driven flexible smart windows.

Cited by 53 publications

References 54 publications

Multistimuli‐Responsive Insect‐Scale Soft Robotics Based on Anisotropic Super‐Aligned VO2 Nanowire/Carbon Nanotube Bimorph Actuators

Multistimuli‐Responsive Insect‐Scale Soft Robotics Based on Anisotropic Super‐Aligned VO2 Nanowire/Carbon Nanotube Bimorph Actuators

Energy-Efficient Smart Window Based on Thermochromic Hydrogel with Ultrahigh Visible Transparency and Unprecedented Infrared Transmittance Modulation

Challenges and Opportunities toward Real Application of VO2-Based Smart Glazing

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Product

Resources

About

Joule heating driven infrared switching in flexible VO₂ nanoparticle films with reduced energy consumption for smart windows

Multistimuli‐Responsive Insect‐Scale Soft Robotics Based on Anisotropic Super‐Aligned VO₂ Nanowire/Carbon Nanotube Bimorph Actuators

Multistimuli‐Responsive Insect‐Scale Soft Robotics Based on Anisotropic Super‐Aligned VO₂ Nanowire/Carbon Nanotube Bimorph Actuators