Optimizing vanadium pentoxide thin films and multilayers from dip-coated nanofluid precursors

Area of Science:

• Materials Science
• Nanotechnology
• Thin Film Deposition

Background:

• Producing uniform thin films of vanadium pentoxide (V2O5) is challenging due to defect formation during precursor processing.
• Nanofluid instability, including heterogeneous nucleation and cluster formation, leads to pinholes and surface roughness in V2O5 films.
• Controlling precursor evolution pathways is crucial for achieving defect-free thin films.

Purpose of the Study:

• To demonstrate a strategy for producing highly uniform V2O5 thin films and multilayers using dip coating.
• To investigate methods for suppressing pinhole and roughness instabilities during V2O5 film formation.
• To explore the use of polymer-precursor mixtures for enhanced film uniformity and reduced surface roughness.

Main Methods:

• Utilized an alkoxide-based precursor for V2O5 deposition via dip coating.
• Investigated polymer-precursor mixtures to stabilize nanofluid formation and control film uniformity.
• Analyzed film properties, including uniformity, surface roughness, and crystalline phases (amorphous and orthorhombic V2O5), on gold and ITO substrates.

Main Results:

• Achieved defect-free and smooth V2O5 films on various substrates.
• Polymer-precursor mixtures significantly improved film uniformity and reduced surface roughness by suppressing instabilities.
• Obtained both amorphous and crystalline orthorhombic V2O5 films with excellent uniformity.

Conclusions:

• Dip coating with optimized polymer-precursor mixtures provides a robust method for producing highly uniform V2O5 thin films and multilayers.
• Understanding nanofluid evolution, including nucleation and dewetting, is key to controlling thin film quality.
• The developed strategy can be extended to other liquid precursors for fabricating functional materials and coatings.