Controlling Nanoparticle Distance by On-Surface DNA-Origami Folding

Area of Science:

• Nanotechnology
• Biophysics
• Materials Science

Background:

• DNA origami offers a versatile platform for organizing nano-objects with high flexibility.
• Existing methods for DNA origami folding primarily occur in liquid, limiting precise spatial control.
• Applications span biomedicine and nano-photonics, driven by customizable nanostructures.

Purpose of the Study:

• To develop a novel method for controlling DNA origami folding using surface adsorption.
• To fabricate tunable plasmonic dimer nano-arrays on silicon surfaces.
• To demonstrate precise control over nanoparticle spacing for enhanced optical properties.

Main Methods:

• Combining top-down lithography (electron beam lithography) with bottom-up DNA origami.
• Creating pre-patterned adsorption sites on silicon surfaces.
• Utilizing self-organized adsorption of DNA origami functionalized with gold nanoparticles (AuNPs).

Main Results:

• Tunable plasmonic dimer nano-arrays were successfully fabricated on silicon.
• The size and shape of adsorption sites controlled DNA origami folding and AuNP dimer spacing.
• Enhanced Raman signals from TAMRA dye molecules confirmed the plasmonic properties.

Conclusions:

• This hybrid approach offers precise control over DNA origami folding and nanostructure assembly.
• The method enables the creation of tunable plasmonic nanostructures with potential in various fields.
• Surface-patterned DNA origami presents a powerful strategy for advanced nanoscale device fabrication.