Templated Oxide Synthesis on Self-Assembled PS-b-PMMA via Atomic Layer Deposition

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Inorganic nanoarrays are crucial for energy storage, photocatalysis, and electronics.
• Direct fabrication methods for these nanoarrays are currently limited, hindering their widespread application.

Purpose of the Study:

• To develop a versatile and effective method for the direct fabrication of inorganic oxide nanoarrays.
• To demonstrate the capability of the new method using aluminum oxide (Al2O3) and other metal oxides.

Main Methods:

• Utilized self-assembled polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) as sacrificial templates.
• Employed atomic layer deposition (ALD) for inorganic material deposition onto template sidewalls.
• Developed a post-treatment process involving template removal and annealing to form dense nanoarrays.

Main Results:

• Successfully fabricated Al2O3 line arrays with exceptional line edge and width roughness (1.6 nm and 1.3 nm, respectively).
• Demonstrated the fabrication of various other inorganic nanoarrays, including TiO2, In2O3, ZnO, and HfO2.
• Showcased the potential of Al2O3 arrays as high-performance hard masks.

Conclusions:

• The templated oxide synthesis (TOS) strategy provides a versatile platform for precision nanofabrication of inorganic oxide nanoarrays.
• This method overcomes limitations in direct nanoarray fabrication, opening new avenues for advanced material applications.