Optimizing Au/Ag core-shell nanorods: purification, stability, and surface modification (Articolo in rivista)

Type
Label
  • Optimizing Au/Ag core-shell nanorods: purification, stability, and surface modification (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/s11051-014-2439-6 (literal)
Alternative label
  • Ma, Yanan; Zhou, Jun; Shu, Lei; Li, Tianhua; Petti, Lucia; Mormile, Pasquale (2014)
    Optimizing Au/Ag core-shell nanorods: purification, stability, and surface modification
    in Journal of nanoparticle research
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Ma, Yanan; Zhou, Jun; Shu, Lei; Li, Tianhua; Petti, Lucia; Mormile, Pasquale (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 16 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 10 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 6 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Ningbo University; Ningbo University; Consiglio Nazionale delle Ricerche (CNR) (literal)
Titolo
  • Optimizing Au/Ag core-shell nanorods: purification, stability, and surface modification (literal)
Abstract
  • The purification, stability, and surface modification of Au/Ag core-shell nanorods (Au/Ag NRs) in a biological buffer solution were systematically studied for the first time. In this study, Au/Ag NRs were synthesized by chemically reducing silver on the surface of gold nanorods using cetyltrimethylammonium bromide as surfactant and then purified by centrifugation washing. Based on the analysis of UV-Vis absorption spectra, TEM images, Raman spectra, and the xi-potential, it was observed that after the second washing step, the Au/Ag NRs displayed good stability and high surface-enhanced Raman scattering (SERS) enhancement. When the as-prepared Au/Ag NRs were centrifuged more than twice, a structural transition in the surfactant layer was manifested with a sudden increase in the Raman signal intensities at 760 and 1,455 cm(-1). Moreover, 4-mercaptobenzoic acid (4MBA) was used as a Raman reporter molecule to investigate the SERS characteristics of the purified Au/Ag NRs. The Raman signal intensity was enhanced with increasing the concentration of 4MBA and reached its highest intensity at the saturation concentration of 1.0 A mu M 4MBA in a 5 ml solution of the purified Au/Ag NRs. To prevent significant aggregation of the 4MBA-tagged Au/Ag NRs, a poly(styrenesulfonate) (PSS) layer was assembled on the nanorod surfaces by electrostatic adsorption for further surface modification, which made the 4MBA-tagged Au/Ag NRs suitable for the labeled biosensing. Subsequently, the characteristics of the PSS-coated Au/Ag NRs were demonstrated for the potential applications of label-free biosensing. (literal)
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