Laser synthesis of ligand-free bimetallic nanoparticles for plasmonic applications

R. Intartaglia*, Gobind Das, K. Bagga, A. Gopalakrishnan, Alessandro Genovese, M. Povia, Enzo Di Fabrizio, R. Cingolani, A. Diaspro, F. Brandi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

A picosecond laser ablation approach has been developed for the synthesis of ligand-free AuAg bimetallic NPs where the relative amount of Ag is controlled in situ through a laser shielding effect. Various measurements, such as optical spectroscopy, transmission electron microscopy combined with energy dispersive X-ray spectroscopy and inductively coupled plasma optical emission spectrometry, revealed the generation of homogenous 15 nm average size bimetallic NPs with different compositions and tunable localized surface plasmon resonance. Furthermore, ligand-free metallic nanoparticles with respect to chemically synthesized nanoparticles display outstanding properties, i.e. featureless Raman background spectrum, which is a basic requirement in many plasmonic applications such as Surface Enhanced Raman Spectroscopy. Various molecules were chemisorbed on the nanoparticle and SERS investigations were carried out, by varying the laser wavelength. The SERS enhancement factor for AuAg bimetallic NPs shows an enhancement factor of about 5.7 × 10 5 with respect to the flat AuAg surface. This journal is

Original languageEnglish (US)
Pages (from-to)3075-3082
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume15
Issue number9
DOIs
StatePublished - Mar 7 2013

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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