High-fidelity and clean nanotransfer lithography using structure-embedded and electrostatic-adhesive carriers

Area of Science:

• Nanotechnology and Materials Science
• Surface Science and Engineering

Background:

• Metallic nanostructures are crucial for advanced devices but fabricating them on flexible or nonplanar substrates is challenging.
• Existing nanotransfer methods struggle with maintaining high fidelity and yield, limiting their practical application.

Purpose of the Study:

• To develop a high-fidelity, clean nanotransfer lithography method for metallic nanostructures.
• To enable efficient transfer onto unconventional and complex substrates.

Main Methods:

• Utilized a polyvinyl acetate (PVA) film as a carrier for embedding and transferring metallic nanostructures.
• Employed triboelectric charging to generate electrostatic adhesion for high-yield transfer.
• Investigated transfer of various metallic materials (Au, Cu, Pd) with nanoscale precision (<50 nm spacing).

Main Results:

• Achieved remarkable nanostructure spacing variation of <1% using the PVA film.
• Demonstrated a high large-area transfer yield of up to 99.93% via triboelectric adhesion.
• Successfully transferred complex 3D nanostructures and enabled transfer onto highly curved surfaces (e.g., optical fiber).

Conclusions:

• The proposed PVA-based nanotransfer lithography offers a robust solution for fabricating metallic nanostructures on challenging substrates.
• Demonstrated practical applications in compact spectrometers and surface-enhanced Raman spectroscopy (SERS) with reliable performance.