Plasmonic percolation: Plasmon-manifested dielectric-to-metal transition

Handle URI:
http://hdl.handle.net/10754/562281
Title:
Plasmonic percolation: Plasmon-manifested dielectric-to-metal transition
Authors:
Chen, Huanjun; Wang, Feng; Li, Kun; Woo, Katchoi; Wang, Jianfang; Li, Quan; Sun, Ling Dong; Zhang, Xixiang ( 0000-0002-3478-6414 ) ; Lin, Haiqing; YAN, Chunhua
Abstract:
Percolation generally refers to the phenomenon of abrupt variations in electrical, magnetic, or optical properties caused by gradual volume fraction changes of one component across a threshold in bicomponent systems. Percolation behaviors have usually been observed in macroscopic systems, with most studies devoted to electrical percolation. We report on our observation of plasmonic percolation in Au nanorod core-Pd shell nanostructures. When the Pd volume fraction in the shell consisting of palladium and water approaches the plasmonic percolation threshold, ∼70%, the plasmon of the nanostructure transits from red to blue shifts with respect to that of the unshelled Au nanorod. This plasmonic percolation behavior is also confirmed by the scattering measurements on the individual core-shell nanostructures. Quasistatic theory and numerical simulations show that the plasmonic percolation originates from a positive-to-negative transition in the real part of the dielectric function of the shell as the Pd volume fraction is increased. The observed plasmonic percolation is found to be independent of the metal type in the shell. Moreover, compared to the unshelled Au nanorods with similar plasmon wavelengths, the Au nanorod core-Pd shell nanostructures exhibit larger refractive index sensitivities, which is ascribed to the expulsion of the electric field intensity from the Au nanorod core by the adsorbed Pd nanoparticles. © 2012 American Chemical Society.
KAUST Department:
Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program; Core Labs
Publisher:
American Chemical Society (ACS)
Journal:
ACS Nano
Issue Date:
28-Aug-2012
DOI:
10.1021/nn302220y
PubMed ID:
22757659
Type:
Article
ISSN:
19360851
Sponsors:
This work was supported by the Research Grants Council of Hong Kong (GRF, ref. no. CUHK403211, Project Code 2130277, and Special Equipment Grant, ref. no. SEG_CUHK06).
Appears in Collections:
Articles; Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorChen, Huanjunen
dc.contributor.authorWang, Fengen
dc.contributor.authorLi, Kunen
dc.contributor.authorWoo, Katchoien
dc.contributor.authorWang, Jianfangen
dc.contributor.authorLi, Quanen
dc.contributor.authorSun, Ling Dongen
dc.contributor.authorZhang, Xixiangen
dc.contributor.authorLin, Haiqingen
dc.contributor.authorYAN, Chunhuaen
dc.date.accessioned2015-08-03T09:59:15Zen
dc.date.available2015-08-03T09:59:15Zen
dc.date.issued2012-08-28en
dc.identifier.issn19360851en
dc.identifier.pmid22757659en
dc.identifier.doi10.1021/nn302220yen
dc.identifier.urihttp://hdl.handle.net/10754/562281en
dc.description.abstractPercolation generally refers to the phenomenon of abrupt variations in electrical, magnetic, or optical properties caused by gradual volume fraction changes of one component across a threshold in bicomponent systems. Percolation behaviors have usually been observed in macroscopic systems, with most studies devoted to electrical percolation. We report on our observation of plasmonic percolation in Au nanorod core-Pd shell nanostructures. When the Pd volume fraction in the shell consisting of palladium and water approaches the plasmonic percolation threshold, ∼70%, the plasmon of the nanostructure transits from red to blue shifts with respect to that of the unshelled Au nanorod. This plasmonic percolation behavior is also confirmed by the scattering measurements on the individual core-shell nanostructures. Quasistatic theory and numerical simulations show that the plasmonic percolation originates from a positive-to-negative transition in the real part of the dielectric function of the shell as the Pd volume fraction is increased. The observed plasmonic percolation is found to be independent of the metal type in the shell. Moreover, compared to the unshelled Au nanorods with similar plasmon wavelengths, the Au nanorod core-Pd shell nanostructures exhibit larger refractive index sensitivities, which is ascribed to the expulsion of the electric field intensity from the Au nanorod core by the adsorbed Pd nanoparticles. © 2012 American Chemical Society.en
dc.description.sponsorshipThis work was supported by the Research Grants Council of Hong Kong (GRF, ref. no. CUHK403211, Project Code 2130277, and Special Equipment Grant, ref. no. SEG_CUHK06).en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectcore-shell nanostructuresen
dc.subjectgold nanorodsen
dc.subjectlocalized surface plasmon resonanceen
dc.subjectpercolationen
dc.subjectplasmon shiftsen
dc.subjectrefractive index sensitivityen
dc.titlePlasmonic percolation: Plasmon-manifested dielectric-to-metal transitionen
dc.typeArticleen
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Laben
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.contributor.departmentCore Labsen
dc.identifier.journalACS Nanoen
dc.contributor.institutionDepartment of Physics, Chinese University of Hong Kong, Shatin, Hong Kongen
dc.contributor.institutionState Key Lab of Rare Earth Materials Chemistry and Applications, Peking University, Beijing 100871, Chinaen
dc.contributor.institutionBeijing Computational Science Research Center, Beijing 100084, Chinaen
kaust.authorLi, Kunen
kaust.authorZhang, Xixiangen

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