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Related Experiment Video

Updated: Apr 23, 2026

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Alkyne-functionalized superstable graphitic silver nanoparticles for Raman imaging.

Zhi-Ling Song1, Zhuo Chen, Xia Bian

  • 1Molecular Sciences and Biomedicine Laboratory, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, College of Biology and Collaborative Innovation Center for Molecular Engineering and Theronastics, Hunan University , Changsha 410082, China.

Journal of the American Chemical Society
|September 19, 2014
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Summary

Superstable silver-copper alloy nanoparticles coated with graphene (AgCu@graphene) resist corrosion and enhance Raman signals. This makes them ideal for sensitive cell labeling and imaging applications.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Surface Chemistry

Background:

  • Noble metals like gold are common in plasmon resonance, but silver's susceptibility to corrosion limits its use.
  • Silver has superior optical properties and lower cost compared to gold, making it desirable for plasmonic applications if stability issues are addressed.

Purpose of the Study:

  • To develop a corrosion-resistant and stable silver-based nanoparticle for plasmon resonance applications.
  • To enhance the utility of silver nanoparticles (NPs) for sensitive detection and imaging through graphene protection and functionalization.

Main Methods:

  • Facile synthesis of AgCu alloy nanoparticles (NPs) coated with multiple layers of graphene (AgCu@graphene, ACG).
  • Testing the stability of ACG NPs against corrosive agents like hydrogen peroxide, hydrogen sulfide, and nitric acid.
  • Functionalizing ACG NPs with alkyne-polyethylene glycol for improved cellular imaging.

Main Results:

  • Graphene coating effectively protected the AgCu alloy NPs from corrosion and contamination.
  • ACG NPs exhibited enhanced Raman signals from the graphitic shell, suitable for Surface-Enhanced Raman Spectroscopy (SERS).
  • Functionalized ACG NPs demonstrated accurate colocalization within cells due to Raman-silent vibrational modes.

Conclusions:

  • A simple method for fabricating corrosion-resistant, water-soluble, graphene-protected AgCu NPs with strong surface plasmon resonance was developed.
  • ACG NPs are promising for cell labeling, rapid Raman imaging, and sensitive SERS detection.
  • The developed nanoparticles offer a stable and effective platform for advanced sensing and bioimaging applications.