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Updated: Apr 24, 2026

Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment

Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment

Published on: April 4, 2017

Tunable nanoparticle arrays at charged interfaces.

Sunita Srivastava¹, Dmytro Nykypanchuk, Masafumi Fukuto

¹Center for Functional Nanomaterials, Brookhaven National Laboratory , Upton, New York 11973, United States.

|September 9, 2014

Summary

This summary is machine-generated.

Researchers created tunable 2D nanoparticle arrays using DNA-coated gold nanoparticles and lipid layers. Adjusting ionic strength changed nanoparticle density by fourfold, offering control over thin film properties.

Keywords:

charged nanoparticle lipid membrane liquid interfaces self-assembly

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Area of Science:

Materials Science
Nanotechnology
Surface Chemistry

Background:

Two-dimensional (2D) arrays of nanoscale objects are crucial for tuning thin film functional properties.
Ordered nanoparticle (NP) arrays offer precise control over material characteristics.

Purpose of the Study:

To demonstrate the assembly of structurally tunable 2D nanoparticle arrays at charged interfaces.
To investigate the influence of ionic strength on nanoparticle array density and structure.
To understand the interfacial properties of nanoparticles with charged soft shells.

Main Methods:

Assembly of DNA-coated gold nanoparticles at charged air-water interfaces.
Utilizing electrostatic attraction between DNA-coated NPs and a lipid layer.
Employing synchrotron-based in situ surface scattering methods, including grazing incidence X-ray scattering (GISAXS) and X-ray reflectivity (XRR).

Main Results:

Formation of a 2D hexagonally closed packed (HCP) nanoparticle lattice.
Achieved a fourfold change in monolayer nanoparticle density by varying ionic strength.
Demonstrated structural retention of NP arrays upon transfer to solid supports.
Observed nonuniform deformation of the nanoparticle DNA corona due to interfacial confinement.

Conclusions:

DNA-coated nanoparticles can form tunable 2D arrays at charged interfaces.
Ionic strength is a key parameter for controlling nanoparticle array density and structure.
The behavior differs from bulk polyelectrolyte systems, highlighting unique interfacial effects.