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Researchers dynamically controlled gold nanorod chiral superstructures using DNA origami. This allows active switching of chiral optical properties, paving the way for advanced reconfigurable chiral materials.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Dynamically tuning nanoparticle self-assembled structures is crucial for advanced materials.
  • Controlling chiral nanoparticle superstructures and their optical properties remains a significant challenge.

Purpose of the Study:

  • To demonstrate dynamic control over gold nanorod 3D chiral plasmonic superstructures.
  • To actively switch chiral optical properties by reconfiguring superstructure geometry.

Main Methods:

  • Utilized DNA origami supramolecular polymers as templates for gold nanorod assembly.
  • Employed DNA-toehold-mediated conformational changes to reconfigure the DNA template structure.
  • Investigated the resulting changes in chiral plasmonic properties.

Main Results:

  • Successfully controlled a gold nanorod stair helix superstructure.
  • Achieved reconfiguration between folded and extended states, and between opposite chiral handedness.
  • Demonstrated active switching of circular dichroism amplitude, peak frequency, and chirality signature.

Conclusions:

  • The DNA-guided strategy enables dynamic control of chiral plasmonic superstructures.
  • This approach facilitates the development of reconfigurable chiral materials for active light control.
  • Rational molecular design and predictable self-assembly are key to advancing these materials.