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Plasmonics

pp 1–8 | Cite as

Gold@Silver@Gold Core Double-Shell Nanoparticles: Synthesis and Aggregation-Enhanced Two-Photon Photoluminescence Evaluation

  • Shervin Daneshvar e AslEmail author
  • Sayed Khatiboleslam Sadrnezhaad
Article
  • 32 Downloads

Abstract

A facile, straightforward, and low-cost method is proposed to synthesize gold@silver@gold core double-shell nanoparticles. The technique is a seed-mediated growth protocol that contains four steps of (1) gold seed synthesis, (2) gold seed growth, (3) silver layer coating through silver salt reduction, and (4) gold layer deposition via gold precursor reduction. The prepared nanoparticles had a narrow size distribution and the average particle size of 28 ± 1 nm. Cysteine was introduced to the nanoparticles solution as a coupling agent to assemble nanoparticles. Aggregation-induced two-photon photoluminescence enhancement of three types assembled nanoparticles, i.e., gold@silver@gold, gold@silver, and gold nanoparticles, was studied. It was observed that the assembled core double-shell nanoparticles presented huge enhancement in two-photon photoluminescence signal in comparison with two other nanoparticles. Moreover, the gold@silver@gold nanoparticle is a stable and biocompatible plasmonic nanosystem. This paper provides a novel candidate for two-photon photoluminescence excitation sensing and imaging for biomedical applications.

Keywords

Gold@silver@gold Core double-shell Localized surface plasmon resonance Two-photon photoluminescence Plasmon coupling 

Notes

Acknowledgments

Prof. Q.H. Xu at NUS is appreciated for providing synthesis and characterization facilities. Dr. M. Garai and Mr. D. Lyu at NUS are appreciated for providing help in the synthesis and TPPL spectra measurements.

Funding Information

This work was financially supported by Iran’s National Elites Foundation.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringSharif University of TechnologyTehranIran
  2. 2.Department of ChemistryNational University of SingaporeSingaporeSingapore

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