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DNA-Guided Close-Coupled Plasmonic "Polyatomic Molecules".

Meiyun Ye1,2, Lei Song1,2, Chuye Pan2

  • 1Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, China.

Small (Weinheim an Der Bergstrasse, Germany)
|March 5, 2026
PubMed
Summary
This summary is machine-generated.

Researchers used DNA tetrahedrons and acetonitrile to precisely assemble gold nanoparticle (AuNP) clusters into specific 3D structures. This breakthrough enables the creation of complex plasmonic metamaterials with controlled conformations.

Keywords:
DNAclose couplingconformationplasmonic moleculeself‐assembly

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Area of Science:

  • Nanoscience and Nanotechnology
  • Materials Science
  • Biophysics

Background:

  • DNA-programmable assembly offers an ideal route to designer plasmonic nanomolecules.
  • Achieving controlled conformations in strongly coupled multi-particle nanomolecules remains a significant challenge.
  • Existing methods struggle to overcome structural variants, hindering the development of 3D plasmonic systems.

Purpose of the Study:

  • To address the conformation-control dilemma in DNA-guided plasmonic metamaterial assembly.
  • To enable the evolution of DNA-guided plasmonic metamaterials into 3D polyatomic systems.
  • To develop a method for creating strongly coupled, higher-order plasmonic molecules with prescribed symmetries.

Main Methods:

  • Utilizing DNA tetrahedrons to guide the assembly of gold nanoparticles (AuNPs) into 2D triangular and 3D tetrahedral suprastructures.
  • Employing acetonitrile as a water-miscible solvent to drive strong coupling of DNA-bonded AuNP trimers and tetramers.
  • Fixing the assembled AuNP clusters with high fidelity using silver (Ag+) soldering.

Main Results:

  • Successfully guided the assembly of AuNP trimers (D3h symmetry) and tetramers (Td symmetry) using DNA tetrahedrons.
  • Demonstrated that acetonitrile promotes strong coupling and close-packing of AuNP assemblies while preserving their symmetries.
  • Achieved high-fidelity fixation of the strongly coupled plasmonic molecules via Ag+ soldering.

Conclusions:

  • DNA tetrahedrons provide a robust framework for controlling the conformation of assembled AuNP structures.
  • Acetonitrile plays a crucial role in facilitating cooperative close-packing and strong plasmon coupling.
  • This work paves the way for DNA-guided construction of complex, higher-order plasmonic molecules for advanced functional metamaterials.