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Phase-Smart VO₂: The Material That Thinks in Temperature

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Quelques nanomatériaux pour application thermochromique Quelques nanomatériaux pour application thermochromique

Le thermochromisme fait référence au phénomène par lequel un matériau subit des changements de couleur sous l'effet des changements de température. Ce changement est généralement provoqué par des changements dans la structure électronique ou molécula...

Phase-Smart VO₂: The Material That Thinks in Temperature

  • June 3,2026.
From "Thermochromic Color Change" to "Intelligent Temperature Control": The Performance Revolution and Application Blueprint of Vanadium Dioxide and Tungsten-Doped Vanadium Dioxide

A miraculous material that can "sense" temperature and automatically regulate light — a phase transition temperature control journey from 68°C to room temperature

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A Window That Can "Think"

Today, when global building energy consumption accounts for approximately one-third of total energy consumption, doors and windows serve as the primary pathway for energy exchange between indoor and outdoor environments, carrying enormous energy-saving potential. In the 1980s, Swedish scientist Granqvist first proposed the concept of "Smart Window," referring to an energy-saving window that can automatically adjust its optical properties in response to external environmental changes. Among numerous smart window materials, vanadium dioxide (VO₂) stands out with its unique thermochromic characteristics, becoming one of the most promising candidate materials.

The magic of vanadium dioxide lies in its ability to undergo an insulator-metal transition (MIT) at a specific temperature, accompanied by dramatic changes in crystal structure and optical properties. Like a "switch" in the material world, it enables intelligent regulation of the solar spectrum. However, the phase transition temperature of pure vanadium dioxide is as high as 68°C, far above room temperature, which limits its practical applications. Through tungsten (W) doping, researchers have successfully reduced this temperature to near room temperature, opening a new era for vanadium dioxide material applications.

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Vanadium Dioxide: The Physical Essence of Thermochromism

Vanadium dioxide undergoes a reversible metal-insulator transition near 68°C (340 K), a process accompanied by the transformation of crystal structure from the low-temperature monoclinic phase (M-phase, insulating phase) to the high-temperature tetragonal rutile phase (R-phase, metallic phase).

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Tungsten-Doped Vanadium Dioxide: Precise Control of Phase Transition Temperature

Product Code Description Particle Size Phase Transition Temperature
P501, Pure-phase VO₂ 100–200 nm, 67°C ± 3°C
WP501A, 1% W-doped VO₂ 100–200 nm, 45°C ± 3°C
WP501B, 1.5% W-doped VO₂ 100–200 nm, 33°C ± 3°C
WP501C, 2% W-doped VO₂ 100–200 nm,  22°C ± 3°C

All four products are available in stock.

For more detailed information on VO₂ and W-doped VO₂, please feel free to contact us.

DSC of 1%W Doped vo2


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Application Fields: From Building Energy Efficiency to Aerospace Thermal Control

1. Smart Energy-Saving Windows (Core Application)

Working Principle:
- Winter/Low Temperature: VO₂ remains in the insulating phase, exhibiting high transmittance to near-infrared light, allowing solar radiation to enter the room and reducing heating energy consumption.
- Summer/High Temperature: VO₂ transforms into the metallic phase, exhibiting high reflectance to near-infrared light, blocking heat from entering and reducing air conditioning load.

Energy-Saving Effects:
- Can absorb >90% of ultraviolet radiation (up to 99% with UV absorber additives)
- Does not affect visible light transmittance, maintaining indoor brightness
- Annual energy-saving potential in temperate climate zones can reach 23%
- Indoor temperature can be reduced by 8.6°C (with photo-actuator structure)

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2. Temperature Sensors

Utilizing the metal-insulator transition characteristics of tungsten-doped VO₂ near room temperature, high-sensitivity temperature sensors can be fabricated. The resistance change before and after the phase transition reaches 2 orders of magnitude, with fast response speed, suitable for precision temperature control systems.

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3. Optical Switches and Modulators

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4. Thermoelectric Devices

After tungsten doping, the electrical conductivity and thermal conductivity of VO₂ become tunable, enabling efficient thermoelectric conversion for energy harvesting and waste heat power generation.

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5. Aerospace Thermal Control Coatings

The European Space Agency (ESA) has developed thermochromic (TCH) coatings based on tungsten-doped VO₂ for satellite radiators:
- Emissivity contrast: Up to 0.26
- Phase transition temperature: Reduced from 65°C to 33°C
- Environmental adaptability: Passed ultraviolet and thermal cycling tests

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6. Other Emerging Applications

- Laser Protection Films: Utilizing the abrupt optical property change during phase transition
- Infrared Detectors: Based on resistance change during MIT
- Optical Data Storage: Utilizing the reflectivity difference before and after phase transition
- Catalysts: For nitration reactions, ethane dehydrogenation, etc.
- Ultrafast Optical Devices: Picosecond-response optical switches


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