Reversible Shape and Plasmon Tuning in Hollow AgAu Nanorods

Sadegh Yazdi, Josée R. Daniel, Nicolas Large, George C. Schatz, Denis Boudreau, Emilie Ringe*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


The internal structure of hollow AgAu nanorods created by partial galvanic replacement was manipulated reversibly, and its effect on optical properties was mapped with nanometer resolution. Using the electron beam in a scanning transmission electron microscope to create solvated electrons and reactive radicals in an encapsulated solution-filled cavity in the nanorods, Ag ions were reduced nearby the electron beam, reshaping the core of the nanoparticles without affecting the external shape. The changes in plasmon-induced near-field properties were then mapped with electron energy-loss spectroscopy without disturbing the internal structure, and the results are supported by finite-difference time-domain calculations. This reversible shape and near-field control in a hollow nanoparticle actuated by an external stimulus introduces possibilities for applications in reprogrammable sensors, responsive materials, and optical memory units. Moreover, the liquid-filled nanorod cavity offers new opportunities for in situ microscopy of chemical reactions.

Original languageEnglish (US)
Pages (from-to)6939-6945
Number of pages7
JournalNano letters
Issue number11
StatePublished - Nov 9 2016


  • Localized surface plasmon resonance (LSPR)
  • bimetallic nanorods
  • electron energy-loss spectroscopy (EELS)
  • galvanic replacement
  • plasmon near-field
  • reconfigurable systems

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering


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