Laser synthesis of ligand-free bimetallic nanoparticles for plasmonic applications

Year: 2013

Authors: Intartaglia R., Das G., Bagga K., Gopalakrishnan A., Genovese A., Povia M., Di Fabrizio E., Cingolani R., Diaspro A., Brandi F.

Autors Affiliation: Nanophysics, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy;
Nanostructure, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy;
Nanochemistry, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy

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 × 105 with respect to the flat AuAg surface.

Journal/Review: PHYSICAL CHEMISTRY CHEMICAL PHYSICS

Volume: 15 (9)      Pages from: 3075  to: 3082

More Information: This work was supported by the Italiano Istituto di Tecnologia. The authors gratefully acknowledge the technical help of Marco Scotto d\’ Abbusco and Dr Andreas Riedinger for chemical synthesis of metallic nanoparticles.
KeyWords: e da rivista: alloy; benzoxazine derivative; cresyl violet; gold; metal nanoparticle; rhodamine; rhodamine 6G; silver, article; chemistry; laser; light related phenomena; methodology; nanotechnology; Raman spectrometry; solution and solubility; synthesis, Alloys; Benzoxazines; Chemistry Techniques, Synthetic; Gold; Lasers; Metal Nanoparticles; Nanotechnology; Optical Processes; Rhodamines; Silver; Solutions; Spectrum Analysis, Raman
DOI: 10.1039/c2cp42656k

Citations: 68
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