A zwitterion-DNA coating stabilizes nanoparticles against Mg2+ driven aggregation enabling attachment to DNA...

Area of Science:

• Nanotechnology
• Materials Science
• Biophysics

Background:

• Plasmonics and photonics require precise nanoparticle (NP) array construction.
• DNA nanostructures offer scaffolds for complex NP arrangements.
• Magnesium ions (Mg2+) stabilize DNA structures but cause NP aggregation.

Purpose of the Study:

• To develop a method for controlled assembly of DNA-functionalized gold nanoparticles (AuNPs).
• To overcome the aggregation issue caused by Mg2+ stabilization of DNA scaffolds.
• To enable the creation of complex, low-symmetry NP arrays for plasmonic and photonic applications.

Main Methods:

• Utilizing a two-dimensional DNA scaffold for nanoparticle assembly.
• Functionalizing gold nanoparticles (AuNPs) with zwitterionic ligands.
• Investigating the effect of zwitterionic ligands on NP stability and array formation.

Main Results:

• Zwitterionic ligand derivatization of AuNPs prevented aggregation in the presence of Mg2+.
• Controlled formation of complex, low-symmetry NP arrays was achieved.
• The method demonstrated successful stabilization of branched DNA nanostructures with functionalized AuNPs.

Conclusions:

• Zwitterionic ligands are effective in preventing NP aggregation during DNA-templated assembly.
• This approach provides a robust method for constructing sophisticated nanoparticle arrays.
• The technique advances the controlled fabrication of materials for plasmonics and photonics.