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Updated: Jun 24, 2026

Assembly of Gold Nanorods into Chiral Plasmonic Metamolecules Using DNA Origami Templates
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Optically responsive gold nanorod-polypeptide assemblies.

Huang-Chiao Huang1, Piyush Koria, Sarah M Parker

  • 1Department of Chemical Engineering, Arizona State University, Tempe, Arizona 85287-6006, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 11, 2009
PubMed
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Researchers created gold nanorod-elastin-like polypeptide nanoassemblies that change optical properties when exposed to near-infrared light. This controllable optical response offers potential for advanced sensing and drug delivery systems.

Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Environmentally responsive nanoassemblies are crucial for biomedical applications.
  • Polypeptides and nanoparticles offer versatile platforms for creating such systems.

Purpose of the Study:

  • To develop gold nanorod (GNR)-elastin-like polypeptide (ELP) nanoassemblies with tunable optical responses.
  • To investigate the effect of near-infrared (NIR) light on these GNR-ELP nanoassemblies.

Main Methods:

  • Self-assembly of cysteine-containing ELPs onto GNRs via gold-thiol bonds.
  • NIR light exposure to induce GNR heating and subsequent ELP phase transition.
  • Optical density measurements to detect aggregation and phase transition.

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Last Updated: Jun 24, 2026

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Main Results:

  • NIR light exposure caused GNR heating, triggering ELP phase transition and nanoassembly aggregation.
  • The optical response (increased optical density) was specific to the GNR-ELP assemblies.
  • The observed optical changes were reversible and reproducible upon laser excitation removal and reapplication.

Conclusions:

  • GNR-ELP nanoassemblies exhibit controllable optical responses mediated by NIR light.
  • This system demonstrates potential for applications in optical sensing and targeted drug delivery.
  • The interface between polypeptides and GNRs enables the creation of optically responsive nanomaterials.