Four-Dimensional Deoxyribonucleic Acid-Gold Nanoparticle Assemblies.

Area of Science:

• Nanotechnology
• Materials Science
• Biotechnology

Background:

• Organizing gold nanoobjects into 3D colloidal assemblies is established but lacks autonomous temporal control.
• Living systems self-regulate structure formation through dissipative biomacromolecular networks, offering a model for temporal control.

Purpose of the Study:

• To present a novel approach for fabricating four-dimensional (4D) gold nanostructures with temporal control.
• To demonstrate the use of DNA fuel as an energy-dissipating pathway for controlled assembly and disassembly.

Main Methods:

• Utilized exonuclease III digestion of DNA fuel to create a dissipative system for energy dissipation.
• Fabricated amorphous clusters of spherical gold nanoparticles (AuNPs) and core-satellite structures of gold nanorods (AuNRs) and AuNPs.
• Leveraged DNA hybridization specificity to control the selective activation of multiple nanostructure evolutions.

Main Results:

• Demonstrated temporal control over the formation of amorphous gold nanoparticle clusters.
• Achieved controlled formation of well-defined core-satellite structures using gold nanorods and nanoparticles.
• Showcased selective activation of diverse gold nanostructure architectures in a single mixture.

Conclusions:

• The developed 4D fabrication method enables autonomous temporal and spatial control over gold nanostructure formation.
• This approach mimics biological self-regulation for creating complex, temporally evolving nanomaterials.
• The high specificity of DNA interactions allows for precise orchestration of multiple nanoscale assembly processes.