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Self-assembly of multiferroic core-shell composites using DNA functionalized nanoparticles.

Atanu Banerjee¹, Jitao Zhang², Peng Zhou^2,3

¹Department of Chemistry, Oakland University, Rochester, MI 48309-4401, United States.

Journal of Magnetism and Magnetic Materials

|May 13, 2021

Summary

DNA-assisted self-assembly of ferrite-ferroelectric nanoparticles revealed that longer DNA linkers enhance magneto-electric coupling. Longer DNA strands create better nanocomposite integration for improved performance.

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Area of Science:

Materials Science
Nanotechnology
Condensed Matter Physics

Background:

Ferrite-ferroelectric core-shell nanoparticles offer unique properties for advanced applications.
Controlling the self-assembly and interactions of these nanoparticles is crucial for optimizing their performance.
Magneto-electric (ME) coupling in such composite materials is a key area of research.

Purpose of the Study:

To investigate the effect of DNA linker length on the magneto-electric (ME) interactions in ferrite-ferroelectric core-shell nanoparticles.
To explore how nanoparticle size and type influence the self-assembly and ME properties.
To understand the relationship between DNA-mediated self-assembly and the formation of integrated nanocomposites.

Main Methods:

Preparation of barium titanate (BTO) core and nickel ferrite (NFO) or nickel cobalt ferrite (NCFO) shell nanoparticles using deoxyribonucleic acid (DNA) assisted self-assembly.
Variation of nanoparticle size and DNA linker length (18, 19, or 30 base pairs).
Characterization using electron microscopy and scanning microwave microscopy; measurement of low-frequency ME voltage coefficient (MEVC) and magnetodielectric effect in assembled films and disks.

Main Results:

Core-shell structures were confirmed via microscopy.
Particles assembled with 30 base pair DNA linkers showed the strongest ME coupling.
Particles assembled with 18 base pair DNA linkers exhibited the weakest ME coupling.
Longer DNA strands facilitated better integration and heterogeneity in the nanocomposites, likely due to bridging irregular nanoparticle shapes.

Conclusions:

The length of the DNA linker is a critical factor in achieving strong magneto-electric coupling in ferrite-ferroelectric core-shell nanoparticle composites.
Longer DNA strands promote better self-assembly and integration, leading to enhanced ME performance.
This DNA-assisted self-assembly approach offers a pathway to engineer advanced heterogeneous nanocomposites with tunable properties.