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Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates

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Published on: March 5, 2019

Assembling Bare Au Nanoparticles at Positively Charged Templates.

Wenjie Wang¹, Honghu Zhang^1,2, Ivan Kuzmenko³

¹Division of Materials Sciences and Engineering, Ames Laboratory, USDOE, Ames, Iowa 50011, United States.

Scientific Reports

|May 27, 2016

Summary

This summary is machine-generated.

Bare gold nanoparticles (AuNPs) spontaneously adsorb to cationic lipid interfaces. DNA-functionalized AuNPs show less ordered packing on these charged surfaces.

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Area of Science:

Materials Science
Surface Chemistry
Nanotechnology

Background:

Cationic lipid monolayers, such as DPTAP (1,2-dihexadecanoyl-3-trimethylammonium-propane), form stable interfaces at the vapor/aqueous boundary.
Gold nanoparticles (AuNPs) are widely used in catalysis, sensing, and biomedical applications, requiring controlled assembly.

Purpose of the Study:

To investigate the adsorption behavior and assembly of bare and DNA-functionalized gold nanoparticles (AuNPs) on cationic lipid interfaces.
To understand the influence of surface functionalization on nanoparticle organization at charged interfaces.

Main Methods:

In-situ X-ray reflectivity (XRR) to determine electron density profiles and vertical assembly.
Grazing incidence X-ray small-angle scattering (GISAXS) to analyze in-plane correlations and nanoparticle packing.

Main Results:

Unfunctionalized (bare) AuNPs spontaneously adsorb to DPTAP cationic lipid monolayers, forming a vertically assembled layer.
XRR confirmed AuNP vertical thickness comparable to particle size, indicating monolayer formation.
GISAXS revealed short-range in-plane correlations for bare AuNPs, while DNA-functionalized AuNPs exhibited less ordered packing.
Salt addition enhanced the adsorption of DNA-functionalized AuNPs but did not improve their in-plane ordering.

Conclusions:

Bare AuNPs self-assemble effectively on cationic lipid interfaces, forming ordered layers.
Surface functionalization with DNA alters nanoparticle packing, leading to reduced in-plane order compared to bare AuNPs.
These findings provide insights into controlling nanoparticle assembly at charged interfaces for advanced material design.