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Light-Controlled in Situ Bidirectional Tuning and Monitoring of Gold Nanorod Plasmon via Oxidative Etching with FeCl3

  • Varsha Thambi
    Varsha Thambi
    Discipline of Chemistry, Indian Institute of Technology Gandhinagar, Gandhinagar, Gujarat-382355, India
  • Ashish Kar
    Ashish Kar
    Discipline of Chemistry, Indian Institute of Technology Gandhinagar, Gandhinagar, Gujarat-382355, India
    More by Ashish Kar
  • Piue Ghosh
    Piue Ghosh
    Discipline of Electrical Engineering, Indian Institute of Technology Gandhinagar, Gandhinagar, Gujarat-382355, India
    More by Piue Ghosh
  • , and 
  • Saumyakanti Khatua*
    Saumyakanti Khatua
    Discipline of Chemistry, Indian Institute of Technology Gandhinagar, Gandhinagar, Gujarat-382355, India
    *E-mail: [email protected]
Cite this: J. Phys. Chem. C 2018, 122, 43, 24885–24890
Publication Date (Web):October 5, 2018
https://doi.org/10.1021/acs.jpcc.8b06679
Copyright © 2018 American Chemical Society

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    Abstract

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    We report on light-controlled in situ bidirectional tuning of longitudinal surface plasmon resonance (LSPR) of single gold nanorods via oxidative etching with ferric chloride. By removing the surfactant layer from the surface of a gold nanorod, we demonstrate that the etching happens only in the presence of an excitation laser, and the etching rate and directionality can be controlled by the intensity of excitation light. At a low excitation power, a blue shift of a nanorod’s LSPR of up to 50 nm was observed, which indicates preferential etching from its tips. Whereas at a high power, we see a red shift of the nanorod’s LSPR of up to 140 nm indicating etching from sides. These results present a new approach for in situ finer adjustments of a selected nanorod’s plasmon resonance.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jpcc.8b06679.

    • Experimental details, optical characterization of single nanorods, chemical etching in the absence of light, sequential etching on the gold nanorods, power-dependent etching of the gold nanorods, temperature rise due to laser excitation, effect of laser excitation on a gold nanorod in the absence of FeCl3, SEM imaging before and after etching, examples of etching on different nanorods, and effect of laser-induced heating (PDF)

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