| Laser synthesis of ligand-free bimetallic nanoparticles for plasmonic applications. | |
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MedLine Citation:
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PMID: 23196320 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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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. |
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Authors:
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R Intartaglia; G Das; K Bagga; A Gopalakrishnan; A Genovese; M Povia; E Di Fabrizio; R Cingolani; A Diaspro; F Brandi |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-11-30 |
Journal Detail:
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Title: Physical chemistry chemical physics : PCCP Volume: - ISSN: 1463-9084 ISO Abbreviation: Phys Chem Chem Phys Publication Date: 2012 Nov |
Date Detail:
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Created Date: 2012-11-30 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100888160 Medline TA: Phys Chem Chem Phys Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Nanophysics, Istituto Italiano di Tecnologia, via Morego, 30, 16163 Genova, Italy. romuald.intartaglia@iit.it. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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