Surface engineering on continuous VO₂ thin films to improve thermochromic properties: Top-down acid etching and...

Area of Science:

• Materials Science
• Nanotechnology
• Surface Engineering

Background:

• Thermochromic materials like vanadium dioxide (VO2) are crucial for energy-efficient applications.
• Improving the thermochromic performance of VO2 thin films is essential for their practical use in smart windows.
• Surface morphology significantly influences the optical and thermochromic properties of VO2.

Purpose of the Study:

• To develop facile and cost-effective surface engineering methods for enhancing VO2 thermochromic performance.
• To tailor the surface morphology of VO2 thin films using an acid-etching top-down approach.
• To investigate a self-patterning method for further improving thermochromic properties.

Main Methods:

• Acid-etching top-down method to transform continuous VO2 surfaces into patterned structures.
• Characterization of surface morphology and thermochromic properties.
• Implementation of a self-patterning approach for VO2 surface modification.

Main Results:

• The acid-etching method successfully created patterned VO2 surfaces, altering morphology from dense-packed to structured.
• Enhanced integrated visible transmittance (Tlum) was observed in the engineered VO2 films.
• Enlarged solar modulating abilities (ΔTsol) were achieved through surface engineering.

Conclusions:

• Surface engineering, particularly acid-etching and self-patterning, offers a facile and cost-effective route to significantly enhance VO2 thermochromic properties.
• The tailored surface morphology of VO2 is key to improving visible transmittance and solar modulation.
• These advancements pave the way for broader applications of VO2 thin films in smart window technologies.