Photon upconversion lithography: patterning of biomaterials using near-infrared light

Area of Science:

• Biotechnology
• Materials Science
• Nanotechnology

Background:

• Protein patterning is crucial for creating functional biomaterials and understanding cellular interactions.
• Existing methods often require complex setups or UV light, limiting their biological applicability.

Purpose of the Study:

• To demonstrate a novel method for protein patterning using photon upconversion lithography.
• To enable precise spatial control over protein deposition on a substrate using near-infrared light.

Main Methods:

• Utilizing upconverting nanoparticles (UCNPs) decorated on a substrate.
• Linking proteins to the substrate via blue-light-cleavable Ruthenium (Ru) complexes.
• Irradiating the substrate with near-infrared light through a photomask to induce localized blue light emission from UCNPs.

Main Results:

• Successful patterning of proteins on the substrate in defined areas corresponding to the photomask.
• Demonstration of Ru complex cleavage and subsequent protein release upon near-infrared exposure.
• High spatial resolution achieved in protein deposition.

Conclusions:

• Photon upconversion lithography provides a non-invasive, near-infrared light-based approach for protein patterning.
• This technique offers a versatile platform for biofabrication and surface functionalization applications.
• The method overcomes limitations of UV-based patterning, expanding possibilities in biological engineering.