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A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles

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Published on: November 14, 2015

Light-Responsive Colloidal Crystals Engineered with DNA.

Jinghan Zhu^1,2, Haixin Lin^2,3, Youngeun Kim^1,2

¹Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL, 60208, USA.

Advanced Materials (Deerfield Beach, Fla.)

|January 17, 2020

Summary

This summary is machine-generated.

Researchers developed a novel method to synthesize and photopattern colloidal crystals using light-responsive DNA. This breakthrough enables precise control over nanoparticle assembly and disassembly for advanced material fabrication.

Keywords:

DNA-nanoparticle superlattices azobenzene colloidal crystals light-responsive materials optical patterning

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Area of Science:

Materials Science
Nanotechnology
Biotechnology

Background:

Colloidal crystals offer unique optical and electronic properties.
Controlling nanoparticle assembly and disassembly is crucial for advanced materials.
Light-responsive materials provide a non-invasive method for dynamic structural control.

Purpose of the Study:

To develop a novel method for synthesizing and photopatterning colloidal crystals.
To utilize light-responsive DNA for reversible assembly and disassembly of nanoparticle lattices.
To achieve precise photopatterning of colloidal crystals on centimeter scales.

Main Methods:

Synthesis of gold nanoparticle colloidal crystals linked by azobenzene-modified DNA strands.
Utilizing photoisomerization of azobenzene for reversible assembly/disassembly of base-centered cubic (bcc) and face-centered cubic (fcc) lattices.
Employing UV light for selective nanoparticle removal and photopatterning on thin films.

Main Results:

Demonstrated reversible assembly and disassembly of nanoparticle lattices triggered by azobenzene photoisomerization.
Achieved selective nanoparticle removal using UV light for photopatterning into desired shapes on centimeter-scale films.
Established a tunable, wavelength-dependent melting temperature (Tm) window (4.5-15 °C) through DNA design and particle size modulation.

Conclusions:

A novel, light-responsive DNA-based method for colloidal crystal synthesis and photopatterning has been successfully developed.
The developed method allows for precise, reversible control over nanoparticle assembly and disassembly.
This approach offers significant potential for creating custom-designed nanostructures and advanced materials.